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Home / Product Category / AMPLIFIER / Stereo Amplifiers / AMP300 High Power 2-channel 235W Each Channel Stereo Amplifier, Class A/B Toroidal Transformers, Dual Source Switching, 2, 4 -8Ω ETL and CE Certified

AMP300 High Power 2-channel 235W Each Channel Stereo Amplifier, Class A/B Toroidal Transformers, Dual Source Switching, 2, 4 -8Ω ETL and CE Certified

Product code: OSD-AMP300

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Features & Specifications

A heavy-duty 350-Watt A/B two-channel dual source amplifier for use as a remote or single amplifier
• Ideal for powering whole-house audio system or dedicated home theaters
• Equipped with 350 Watts per channel peak power, 470 watts Bridged Mono into 8 ohms
• Dual source capable for greater listening flexibility
• Clean, brushed metal front panel with a volume control, power on/off button and balance control
• Protection circuitry safeguards the amp from a short circuit
• Can be configured as bridged or stereo amp

A solid high-power amplifier does more than make the sound you love louder. A well-built power amp cleans up sound quality, improves bass response and delivers the right amount of power to efficiently drive multiple speakers in distributed audio system or home theater. Our AMP300 is a flagship amp that sells well for a reason. This 350-Watt A/B two-channel dual source amplifier is ideal for use as a remote amplifier to power your whole house audio system or as a single amp for a dedicated home theater or media room, and you won’t find an amp with the same features that we pack in at such an affordable price. It is stable at 2 ohm load.

Dual Source Switching

The AMP300 also includes dual source switching to connect two audio sources and toggle between them for greater listening flexibility. Automatic source switching switches between connected sources with a priority signal-sensing feature, so if a DVD player is connected to input 2, then you decide to stream a movie through a game console, when the console is turned on, the AMP300 automatically switches to that source. The AMP300 also includes a variable delay control that lets you adjust the amount of time needed to "listen" for a signal from your main input, between 3 and 15 seconds. This prevents gaps between music tracks from accidentally switching your inputs. This high power amplifier includes two RCA signal level inputs so with the addition of an RCA-to-mini stereo cable (sold separately), you can connect your smartphone or other device.

Plenty of Power for the Price Pair our AMP300 with the power-hungry speakers, and the sound quality will transform your listening experience. Rated at 350 Watts per channel peak power (470 Watts Bridged Mono into 8 ohms), the AMP300 can be configured as bridged or stereo. In bridged mode, you can combine the left and right channels into one audio channel which bumps up the power to a whopping 470 Watts (8 ohms). When playing dual sources, switch to stereo mode which reduces the power to 350 Watts per channel. It is the only high current 2 ohm load stable amp in the market.

Price-defying Features

The AMP 300 also includes two sets of speaker outputs with front panel controls, auto-on signal sensing or 12-volt trigger, rear panel master level controls, dual line-level inputs with priority override switching and dual voltage of 110V/220V and auto signal sensing. This amp has a clean, brushed metal front panel with a volume control, power on and off button and a balance control knob to adjust the balance between the left and right channels and dial in just the right sound level mix. Special protection circuitry safeguards the amp from a short circuit.

Specifications

Other Product Info

The AMP300 (MI6) is an excellent power amplifier for pro-installation applications. It is a high current (2 Ohm Stable) two channel power amplifier, which is overload stable. It is ideal for use as a remote amplifier, or as a single or dual zone amplifier. It's the perfect heavy duty, high fidelity amp for powering your whole house audio system! This amplifier can produce some serious power to drive your whole house audio speakers! Weight is 40lbs. Feature

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OWNER'S MANUAL

  View Owner's Manual          

QUESTIONS & ANSWERS

50 Questions & 52 Answers
Tim
from Winston Salem,N.C. asked:
June 28, 2019
My name is Tim I have an amp 300 and a Rotel 6 channel amp with a B/K 3090 preamp and multiply speakers and 3 powered subs which connection is best to run through the amp300 
1 Answer
Hi Tim:


I would like to no more so I could best answer your initial question. What sources are you using (New options like Wi-Fi, Bluetooth, SONOS, Google Chromcast, Apple Play, Alexa or more old school like Turntable or CD, etc.)? How many zones do have and what speakers (brand and model)? Are you looking to have a dedicated subwoofer in three different zones? How are you currently setup with the B/K and Rotel (both excellent components)? Are you presently using Volume Controls?


Inquiring minds would like to know; tim@osdaudio.com


TL/5589

Submitted by: Tim Leahy on June 30, 2019

Bob
from Indianapolis, IN asked:
June 23, 2019

Another possibly dumb question. Will this AMP work as a stand alone with out an Pre-Out from another source ? All I am looking to do is connect a Bluetooth receiver to a unit and play

Pandora or I tunes play list from phone in an outdoor setting. At the moment, I'm thinking I need more power to drive the speakers. Thank you

1 Answer
Hi Bob:


The AMP300 is a stand-alone amplifier that features Priority Source switching between two source inputs. Line 1 Input takes priority over line 2 Input (there is a variable delay switch 3-15 seconds). It also features a Line 2 output from Line 2 input. We also offer an affordable Preamplifier our OSD Prreamp1 which adds additional front end control including a Mic Mixer, 4 Inputs one of which is for a Phono connection, a perfect match for the AMP300 and AMP200.

The real question, will you need this amplifier based upon your application.


TL/5581

Submitted by: Tim Leahy on June 30, 2019

Bob
from Indianapolis, IN asked:
June 23, 2019

Hello - I'm running two OMSub 200s from the B channel of my Sony receiver (100x100 watt) with two LS3 satellite speakers each on them. On channel A are the mains only. The systems works fine and the sounds is very good. 

I'm looking for a little more low end "depth" to the sound and am wondering if a more powerful AMP would do it. I'm looking at the AMP 300 or the AMP 200. I'm wondering if either of these could achieve the low to medium end quality

I'm hoping to achieve. I never crank up to high volume levels as this is an outdoor deck system. Let me know your thoughts. Thank you.

2 Answers
Hi Bob:


I have been scratching my head trying to figure out how you have the two subs, and two pair of LS3 wired to your SONY Receiver. And which Receiver do you have; The SONY STR-DH130 or the newer STR-DH190 (or something else)? Can you also confirm that you have the 4-ohm OMSub200S or the 8-ohm OMSub200? The Sub200s has no internal crossover, and the Sub200 (no S) has an internal crossover and four output wires (right and Left +/-). What do you have connected to the Speaker A outputs (Brand and model)?  At first glance, I thought you should consider a dedicated Subwoofer amplifier instead of an AMP300. We have a 1000 watt Sub Amplifier with a DSP circuit built in for less than the cost of the AMP300 (SMP500). I would love to discuss further; please let me know if you can contact me; tim@osdaudio.com.


TL/5580

Submitted by: Tim Leahy on June 30, 2019
Hi Bob:


I am still trying to figure out how you wired the two OMSUB200S and two pair of the LS3 and keeping your SONY Receiver happy. The OMSUB200 is a Passive Subwoofer with no internal crossover that we recommend using a dedicated Subwoofer amplifier. The Internal sub of each OMSUB200S rolls off naturally. I am assuming you connect one sub to the Speaker B left and the other to Speaker B right. That would show your SONY Receiver (either the STR-SH130 or the STR-DH-190) a 4-ohm load. That would mean you would have connected the two pairs of LS3 in series from the Receiver or connected in parallel to the OMSUB200S. I would have recommended the OMSUB200 (no S) a  Passive subwoofer with built-in crossover (identical to the OMSUB200S) but it is an 8-ohm speaker with thru connections. I would recommend 

Submitted by: Tim Leahy on June 30, 2019

frank
from 10965 asked:
May 16, 2019
Hello, 

Maybe you can help - I have a amp300, 3 pairs of outdoor speakers, & a amp 500 - for unground subs, I want to use 2 Sonos connects 1 for the sub and one for the speakers, bridged , 

so I can have control of the sub 

my question is how can I hook up the 3 pairs to the amp300 and be able to control the volume of each pair(separate locations around pool, deck, etc ). right now  I am using the

 Leviton digital control volume interfaces

but want to replace that part of the system because leviton can not handle the power of the amp, distort at high volume (I'm assuming this is the distoration issue,  ) 

I also ran outdoor 12 ga wire to the speakers (though that was the issue ) all home runs ran to amp location 

1 Answer
Hi Frank:

 I am sorry you are having issues. I am assuming you are referring to our OSD SMP500 Subwoofer amplifier to go along with our AMP300. I would be glad to help you with your application. Can you confirm if I am correct on the Sub amplifier? If so I would suggest using a single SONOS Connect and have that wired to the SMP500 Sub-amp signal level input. Then connect the AMP300 to the signal level outputs of the SMP500 to Input Line 2 of the AMP300. Then you have a couple of choices either OVC300 volume controls for each pair of speakers (3 pair) for your outdoor setup. You can connect two pair of speakers to the Speaker A of the AMP300 and the third pair to Speaker B of the AMP300. The 12 Gauge will connect directly to the AMP300 for the three pairs of speakers. The 12 gauge is ideal for the SMP500 for the In-Ground subs. Both the AMP300 and SMP500 feature gain and volume control so you can match the overall output of the entire system. The OVC300 will provide local control of the external volume of the three pair of speakers. There is no active gain with the OVC300; you are turning the sound down (attenuating) from the master (which would be your SONOS Connect through your enabled devices). Note: The SMP500 has an IR Remote Control which we could supply you with the IR Codes. You might be able to add a Remote Control app on your smartphone and be able to control the SMP500 that way. You can match the volume levels for both the AMP300 and SMP500and then control your volume with the SONOS (through your device). The OVC300 allows you to make minor adjustments to the volume levels at each pair of speakers. The primary purpose of the OVC300 is to control the Impedance Matching for your AMP300, so each Volume Control setting is 4X. If you need additional help, let me know all the components you have while confirming the dedicated Subwoofer Amplifier. I can provide you a wiring diagram as well. tim@osdaudio.com. 


TL/5535

Submitted by: Tim Leahy on May 17, 2019

Ruby
from Canada asked:
March 18, 2019
Is it possible to add mic to this unit if I had a big gathering. If yes how ?
1 Answer
Hi Ruby: The best most affordable solution for adding a mic mixer is our PRE-1 Preamplifier which has four selectable inputs including one Phono, two Aux, and one DVD/CD input. The PRE-1 features a 1/4" input plug for the Microphone with dedicated volume control for the Mic. There is a master volume that controls the output including the Mic. The PRE-1 is currently out of stock (expected in the next 30 days). TL/5458
Submitted by: Tim Leahy on March 19, 2019

ANDREW
from Moscow russia asked:
February 26, 2019
Hi WOULD YOU TELL ME ABOUT 1. damping factor 2.volume transformer 3.and capacitors
1 Answer
Hi Andrew: I was able to get an answer for point 1: Damping Factor; 58 @ 4 Ohm 1 KHz and 105 @ 8 Ohm 1KHz Point 2: Volume Transformer, The factory does not know what this is. Point 3: Capacitance 6800uF x 4 pcs. 2 out of 3 is what I have. Can you be more specific on what spec you are looking for the Volume Transformer? How is it reported or rated? TL/5439
Submitted by: Tim Leahy on March 6, 2019

Mark
from California, San Francisco asked:
February 24, 2019
Does this have dual volt-meter in front like your other Amp models? I saw one in you tube which had this but wasn't sure. It would be nice to have it also. See the link below https://www.youtube.com/watch?v=E7CK7NMmiRc
1 Answer
Hi Mark: The latest version of the AMP300 no longer has the front panel meters. We are also converting the AMP200 removing the meters as well. The Meters were more cosmetic than functional and sometimes when they did not work the amp was playing fine, but people would still want to return the amp. TL/5431
Submitted by: Tim Leahy on February 27, 2019

Ric
from Los Angeles asked:
February 7, 2019
is this unit able to be rack mountable? what are the dimensions of the amp? are rack ears available for it?
1 Answer
Hi Ric: The AMP300 and AMP200 are not rack mountable. They do not have the screw holes in the chassis. We will change the bullet point to reflect no Rack mount option. You will need to use a Universal shelf for rackmount installation. TL/5402
Submitted by: Tim Leahy on February 13, 2019

Chris Tabeling
from Comins MI asked:
January 25, 2019
I will connect my one zone 2 preout on Onkyo 8260 receiver to line one on amp. Is there a way to connect my regular speaker connections on receiver to amp so I can switch between using amp or just receiver? On receiver that would be main room or zone 1. Are the speaker-in connections for this?
1 Answer
Hi Chris: You can connect the pre-amp zone 2 to line 1 input. Then connect either Speaker A or Speaker B output from the ONKYO receiver to the Speaker Level inputs of the AMP300 making sure to set the switch above the inputs to the number 2. Switching between the two inputs is automatic with Line 1 taking priority. When you turn off whatever connected to Line 1, then Line 2 comes on after a slight delay (adjustable between 3 and 15 seconds). Note, Line 2 output is a thru put connection for whatever you have connected to Line 2 input (either speaker level or signal level). Note: you can add a powered subwoofer to the ONKYO Receiver Sub Pre-amp connection. But you will need to make sure to connect the Speaker A of the ONKYO to the speaker level inputs of the AMP300. The pre-amp sub output does not work with Speaker B of the ONKYO. Good choice TL/5384
Submitted by: Tim Leahy on February 2, 2019

Chris Tabeling
from Comins MI asked:
January 25, 2019
My Onkyo TX-8260 has only 1 pre out zone 2 a@b. Speakers are Klipsch RP 8000F 150/600 w. 8 ohm. Can I hook up two more speakers, or do I need another pre out on receiver? Thank's
1 Answer
Hi Chris: The AMP300 is perfect for your application. You would connect the first pair of speakers to Speaker A output of the AMP300. And a second pair to the Speaker B output of the AMP300. The AMP 300 would connect the ONKYO Zone 2 Preamp output to the Input # 2 of the AMP300. There are speaker A and B switch on the front of the AMP300. You can play either A or B or both at the same time. Great Choice TL5383
Submitted by: Tim Leahy on January 26, 2019

Mark
from Flower Mound, Texas asked:
November 23, 2018
Forgot to ask one question. Does this amp have a pre-out? How would I wire a powered subwoofer to my system from this amp assuming I mono bridge out to the selector switch? Would it still be possible if I used 2 zones out to the switch?
1 Answer
Hi Mark: First, there is a Line 2 Pre-amp output that is a pass thru for sources connected to Line 2 input. The amp features automatic source switching where you can have two sources connected. Anything connected directly to line 1 when activated comes on instantly and takes priority over the Line 2 input. Note, Only a source hooked to Line 2 input will play through Output #2. The minor problem would be if you have both Line 1 and Line 2 connected and playing then Line 1 would take priority and play through whatever speakers hooked to Speaker A or B or both A and B at the same time. Line 2 would not be heard through the speakers but would be passed through to the powered subwoofer. Regarding Bridging the AMP300, you can only bridge one output either A or B. And nothing else. It also needs to be an 8-ohm load. People who want to bridge this amp purchase two AMP300, one for the right channel and the second one for the left channel. The amplifier is a true High Current Amplifier that is 2 ohms stable. I hope that helps. TL/5301
Submitted by: Tim Leahy on November 24, 2018

Mark
from Flower Mound, Texas asked:
November 23, 2018
I’ve got a 6-zone system of ceiling speakers with a pair of 75W, 8 ohm speakers per zone. All speakers are individually home run wired back to an Audioplex Opt-6, 6-zone speaker selector with impedance protection. In the past 3 years I have fried (2) Audio Source AMP100VS 2-channel amplifiers so obviously I’m doing something wrong or I have improperly powered equipment. Hoping the AMP300 will fix it. The switch has 2 input zones but I have the stereo amp bridged (amp says 150W max at 8 ohms) to a single input (A) on the selector switch since all speakers play together. It played fine till I turned it up a little (not even super loud) then I could hear distortion in the speakers and the amp smoked. Any suggestions would be appreciated and if you think this amp is suited for my set up.
1 Answer
Hi Mark: The Audiosource AMP100 is similar to our Amp120; I would not have recommended either of these amplifiers for your application. There are what we refer to as chip amplifier's that feature IC components in the audio section. The IC's amp designs are entry level compared to our OSD AMP200 or AMP300. Both are High Current Amplifiers with plenty of headroom and true audiophile sound quality. There is a reason the AMP300 weights 35 pounds versus 8 pounds of the AS AMP100/OSD AMP120. You will want to set the AMP300 to Stereo Mode for your application. Also you might want to consider purchasing two of the AMP200 and use the first AMP200 for source A and the second for Source B. The Audioplex Speaker selector features independent Aor B source per zone so you can play source A for zones 1, 3 and 5 and then Source B for Zones 2, 4 and 6 or any combination you need. You could also have a powered sub in two different zones each connected to an AMP200 line 2 output. You could even hook up an Amazon Alexa Echo Dot, or Google Chrome Cast Audio or even SONOS Connect to each AMP200 and control your sources remotely either through your phone or in the case of the echo with your voice. And it's a great weekend to buy one or more of these streaming devices. TL/5300
Submitted by: Tim Leahy on November 24, 2018

Jor
from Dallas asked:
November 17, 2018
Can I hook up an Onkyo TX-8050 to this amp and how?
1 Answer
Hi Jor: Yes, you can connect the AMP300 to the ONKYO TX-8050. It would be hooked up to the ZONE2 output of the ONKYO Receiver using an RCA stereo patch cord. It would not affect the main Speaker A or Speaker B output of the ONKYO. TL/5288
Submitted by: Tim Leahy on November 24, 2018

Kenny Bailey
from MO asked:
November 1, 2018
buyer has to pay return shipping? thanks
1 Answer
Hi Kenny: That is our policy. Most items are shipped free freight to you and if it is an item that is to be replaced we will cover that freight back to you as well. TL/5270
Submitted by: Tim Leahy on November 3, 2018

CJ
from MA asked:
October 30, 2018
Can I use BOTH speaker A and Speaker B outs from the AMP300 into the SAME 4-zone (Dual-source) speaker selector (Russound SDB 4.1)? Will this improve power per zone if I select Speaker B for 2 zones and Speaker B for the other 2 zones? Or is it ill-advised to pull the AMP300 into the same selector through both the A + B simultaneously? Thank you.
1 Answer
Hi CJ: In theory, you can connect Speaker A to Zones 1 and 2 and Speaker B to Zones 3 and 4 of the Russound SDB 4.1. Technically you would be lowering the load to 4 ohms and getting more output from the AMP300. You may need to change the impedance setting on the Russound 4.1 internally (owners manual talks about removing the cover to access the jumpers) to 2X for all zones. The unit comes with all jumpers set to 4X. The three internal settings are 2X, 4X, and 8X refer to how many 8 ohm connections you are making. And if you are only connecting 2 zones to both Speaker A and Speaker B you are making only 2X. I believe that will get the maximum output from the AMP300. You need a good High Current Power Amplifier like the OSD AMP300 to accomplish this. TL/5266
Submitted by: Tim Leahy on October 30, 2018

Michael
from Newberry, SC asked:
October 30, 2018
I have a Marantz SR7010 receiver with 4 Definitive BP8060STs (well all speakers in picture). Not worried about center and Atmos speakers (receiver can push those). What amp would best push the 4 towers though for clean, loud and clear sound? Want to see what the towers can actually do with proper power.
1 Answer
Hi Michael The OSD MP300 bundled with the OSD Audio Pre-One would be the best we can offer for your application. The AMP300 is a Class AB true High Current Power Amplifier. The Pre One provides the front end with a 1.5V gain. There is a special discount for any of our OSD Audio Power Amplifiers for Halloween that we would extend to the Pre-One as well. Plus free shipping. Good choice TL/5265
Submitted by: Tim Leahy on October 30, 2018

Hal
from Melrose Ma asked:
October 12, 2018
Hi, the current setup I have is this: Kenwood KR 8050 (analog receiver circa 1980) rated at 120 watts per channel and looped thru a BSR model EQ 3000 10 band graphic equalizer. The combination is powering a pair of massive Cerwin Vega (VS Series) speakers. Just wondering if the AMP300 would work as a good addition for my analog setup here. I need you to guide me thru how to set the amp up here though. I am a senior but love my music to sound clean and clear. Can I also connect a Sony powered sub to this setup? I am also using an Oppo BD 93 for movie watching but with analog sound of course. If this will work can you tell me how I would connect it up? Thanks so much!
1 Answer
HI Hal The AMP300 has two connection choices one which would work for you. The first is signal level input which would need a dedicated preamp output from the Kenwood Receiver (not available). The second connection a Speaker level input will work with the Kenwood. I am assuming you connected to Speaker A output (with Speaker B and C open). The AMP300 would come between the speaker wire connection from the Kenwood and the CERWIN VEGAS. You would connect the Right and Left (+/-) from the Kenwood to the Right and Left Speaker input of the AMP300 making sure the switch on the AMP300 set to Input #2. That way you can use the Line 2 Output to connect to the SONY Powered Subwoofer. Lastly, connect speaker wires from the CERWIN VEGA to Speaker A High-Level Right and Left (+/-) of the AMP 300. Ironically the AMP 300 is based on AMP Technology from the Mid-eighties. It is true audiophile High Current Power Amplifier with High Output Toroidal Power Supply, Plenty of Storage Capacitance, all discrete components and Ample Internal Heatsink. It is 2-ohm stable. From one senior to another, I hope that helps. TL/5243
Submitted by: Tim Leahy on October 13, 2018

Timothy Rogers
from Texas asked:
October 11, 2018
Hi my name is timothy, i have an 8 zone setup. 2 ACE850 per zone. I have impeadence matching volume controls connected to each individual zone. I have all the wires running into my cabinet. I need to know if 2 of the amp300 would be enough to power my setup. How would i wire it. What would i set the switch to on the impeadance matching volume controls to. I plan to play them loud. Thanks
1 Answer
Hi Timothy: I would suggest adding 2 DSM4 Speaker selectors to a single AMP300. Run one DSM4 off Speaker A. Make sure all four volume Impedance matching Volume Controls set to 4X. Then connect the second DSM4 to Speaker B output and all four of those Impedance Matching Volume Controls to 4X as well. The AMP300 run at 4 ohms with all 8 zones playing. Assuming you do not currently have a speaker selector already. Either way, the protection for the speaker selectors should be disabled/off. The DSM speaker selectors have the protection switch on the back (out of sight out of mind). If you are not getting enough output from the single AMP300, you can add a second unit and run a single DSM4 off each. TL/5240
Submitted by: Tim Leahy on October 12, 2018

Travis
from Danville, KY asked:
September 23, 2018
I bought your amp 300 to push the woofers in my cabinet. It was advertised as being 300w per channel. It's not , as listed in the owners manual. I own a Yamaha R-N402 receiver that provides crisp sounds but has trouble pushing my 10 &12 in each cabinet. What do you think I should do to remedy this situation?
1 Answer
Hi Travis: I need a little bit more info on what you have connected (what and how you have it wired). Note: I have never cast the AMP300 as a Subwoofer amplifier. A better choice would have been our new SMP500. How long have you had the AMP300, where did you purchase the amp from; OSD or AMAZON? tim@osdaudio.com TL/5215
Submitted by: Tim Leahy on September 24, 2018

Robert
from Holmdel, NJ asked:
August 20, 2018
I am currently running an Onkyo TX-RZ820 in the house and am looking to have the Zone 3 pre-out feed an AMP300 that will drive either three or four pairs of outdoor 8ohm speakers. My desire is to have a volume control for each pair of speakers and was wondering if the AMP300 was appropriate or perhaps a bit "overkill" for the application.
1 Answer
HI Robert: The AMP300 is a perfect match for your ONKYO TX-RZ820 (A real beast itself). You are always better off having more power than not enough. TL/5174
Submitted by: Tim Leahy on August 23, 2018

Hank
from New York asked:
August 5, 2018
What is the true continuous power output per channel RMS of this amp, two channels driven at 8 ohms?
1 Answer
Hi Hank: The 8-ohm rating listed in the Owner's Manual is 150 watts per channel and 235 watts per channel at 4 ohms. It has no problem driving three pairs of 8-ohm speakers which would produce a 2.6-ohm load. The AMP is a true High Curren Amplifier with a large Torodal power supply, plenty of Capacitance, all discrete components and ample internal heat sink (That is why it weighs 35 lbs.) to handle the additional heat created by the lower impedance current demands. TL/5148
Submitted by: Tim Leahy on August 7, 2018

Jim Beard
from Henderson, NV asked:
July 24, 2018
I am having a contractor build me an outdoor patio in Las Vegas area. There will be an outdoor Tv cabinet also built. I am looking at placing 4 outdoor speakers maybe Polk, Bose, or Klipsch. I will need a stereo amp rated for outdoor and OSD 200 & 300 look like they may fit the bill. The summers get to 115 deg F. Can your amps take that amount of heat? I don’t see a temperature rating in the specs. Please advise...Jim
1 Answer
Hi Jim: The AMP 300 would be the best. Outdoor you want more power. The thermistor that measures the heat on the circuit boards is rated at 95 degrees centigrade (203 F) before it would shut down. I am assuming you will be building it into a cabinet so it is not exposed directly to any moisture. Looking for ideal dessert outdoor speaker check out the AP650 with an IP rating at IP:6X 100% sealed from dust exposure. Check out the unique mounting bracket that swivels and tilts as well. You also have automatic source switching between Source #1 and Source #2. Source 1 takes priority and source 2 has a 3 to 15-second delay before it comes on. Note; if you want to add a subwoofer, there is a Thru output that plays whatever is connected to Input number 2 on the AMP300. Check out our new SMP500DSP Subwoofer Power Amplifier. We also have a couple of in-ground subs to match. Go big or go home... Good luck TL/5125
Submitted by: Tim Leahy on August 1, 2018

Richard
from Sayville Ny asked:
July 5, 2018
I have 8 Polk atrium 5 speakers wired in series 4 are connected to the A side and 4 are connected to the B side. I have 2 Sonos connect units both hooked in to the amp. The goal was to be able to play one source to 4 and the other source to the other 4 speakers. At this point whatever I stream through the Sonos plays on all 8 speakers. Do I need to change the connections at the amp to make this function as planned?
1 Answer
Hi Richard: The problem you have is the AMP300 has Automatic Source Switching between two sources (Two SONOS Connects in your case). But it plays one or the other not both at the same time. What you needed is a separate amplifier for each SONOS Connect. The next question would be, do you want the option of playing all four pair from one SONOS Connect? Or each SONOS Connect just playing the same two pair? You really need a dedicated Amp for each SONOS either way. If you just want a SONOS Connect to be dedicated to two pairs of the Atrium 5 you might want to look at our XMP100 x 2 where you can connect one pair to Speaker A and the second to Speaker B (both speaker switches on the front would need to be pushed in at the same time). If you want more power like the AMP300 then look at swapping out for two AMP200, one for each the SONOS Connect. The AMP200 would provide the most output. You could connect 2 AMP200 each with its own SONOS Connect. The first one would connect to Input Line 2 input and then the SONOS Connect to Line 1 input of the second AMP200. Now you can connect the Line 2 0utput of AMP200 #1 to the Line 2 Input of AMP200 #2. This would allow you to play one SONOS Connect for all four pair (the second SONOS Connect would need to be turned off). You have 30 day performance guarantee on the AMP300. Note the XMP100 has the same option but the in and outs are labeled differently. Line #1 is labeled Interrupt and Line 2 in/out are labeled mains. The Atrium 5s are fairly efficient and do not need a whole lot of power to get them playing with its 91dBN sensitivity Let me know what you think: tim@osdaudio.com. Let me know if you need further clarification TL/5097
Submitted by: Tim Leahy on July 12, 2018

Mike Newman
from Cincinnati, Ohio asked:
June 3, 2018
Are you able to use speakers A and speakers B at the same time? If so, what is the power output while A+B are both on? I have this amp and the trigger out does not turn off unless you turn the AMP300 off with the power switch. Is there a "delay" once the amp goes into standby mode before the trigger out shuts off?
1 Answer
HI Mike: Two good questions in one, first there is no problem playing speakers A and B at the same time. The AMP300 is a true High Current amplifier that is 2-ohm stable. Technically you can drive three 8 ohm speakers in parallel. You could have two 8-ohm speakers connected to Speaker A and a single 8-ohm speaker to speaker B and the amp would see a 2.6-ohm load. You could drive a 4-ohm speaker on A and an 8 -ohm speaker on Speaker B with same 2.6-ohm as well. There is a reason why the Amplifier weighs . It features a high Power Toroidal Power Supply, plenty of internal capacitance, all discrete components in audio section and ample internal heat sink to help dissipate the heat created by the additional current demand. Regarding the second question on the 12V trigger I am assuming the trigger might have to see a total turn off versus just going into standby mode. I am not sure if the amp is in trigger mode that it even goes into standby mode. It may only be associated with the auto-sensing option. Usually, it takes 5 to 15 minutes to go to standby mode in auto sensing. We will have to test it to confirm. TL/5026
Submitted by: Tim Leahy on June 6, 2018

Billy
from New York asked:
March 29, 2018
What are the physical dimensions of this amplifier? (Preferably in inches)
1 Answer
Hi Billy: 16 1/2" W x 5 1/4" H x 14" D 40 pounds net weight Amplifier includes a Heavy Duty Toroidal Power Supply, All discrete components, Plenty of Internal Capacitors, Triple Darlington Audio Section, 2 Ohm Stable... Ample Internal Heat sink to handle High Current for a True Audiophile sound quality Plus other features PS Great Choice TL/4877
Submitted by: Tim Leahy on April 16, 2018

Nik G
from Novi, MI asked:
March 6, 2018
Please help me suggest a good amp for the whole home system shown in the attached picture.
1 Answer
Hi Nik: Look no further, you have found the best Amplifier for the job. The Amp 300 is a true High Current Audiophile Power Amplifier that features a heavy duty Toroidal Power Supply, Plenty of internal Capacitance, All discrete components , Triple Darlington Audio Section and ample internal Heat Sink which helps explain why the Amplifier is 35 pounds. It is the real deal. Great Match TL/4836
Submitted by: Customer Service - Q&A on March 10, 2018

Rickey
from Idaho asked:
February 26, 2018
Hi my name is Rickey I am using a onkyo TX-NR676 to power my surround sound/stereo speakers in my living room. I am adding a pair Polk atrium 8's and a pair of Polk atrium 6's to my back patio. I would like to add a out door sub down the road and some bed room,kitchen speakers. I recently purchased the AMP 300 and the ISS6 with Independence matching.I am also using 100 watt volume controls.how would you recommend wiring this set up and what kind of power am i going to see to my out-door setup. Thanks in advance
1 Answer
Hi Rickey: It is pretty simple, the ONKYO TX-NR676 has Zone 2 pre amp that you would connect to the AMP input #2 using a stereo RCA patch cord. Then you need to connect to the input connector of the ISS6 from the Speaker A output of the AMP300. I am assuming you purchased one of our Whole house audio bundles with an AMP300, ISS6 Speaker Selector and 6 SVC100 Volume Controls. technically to make this work you need an impedance matching volume control for each zone you have connected. So zone one for the Atrium 8, zone 2 for the Atrium 6 , zone 3 for the kitchen, zone 4 for one of the bedrooms (usually the master bedroom). The trick is the atrium outdoor speakers should have an OVC300 outdoor volume control for each pair (unless you will be mounting the volume control inside the house). You have to run the wire from the Zone output connector (There are three dual zone output connectors; Zone 1 & 2, 3 & 4 and 5 & 6). The easiest is to use a four conductor cable like a 16/4 CL3/FT4 rated cable run to each volume control. This is a single cable with four individual color coded jacketed conductors (red, black, white and green). Then from the volume control you you connect two conductor cables like our 16/2 CL3 rated cables. One to each speaker. one right and one left both (+/-). These are color coded red and black. Now depending on how many speakers you have connected you set the impedance matching on the Volume control either 1/2x, 4x or 8x. If you were just doing the two pair of speakers you would set the Impedance matching to 1/2X. When adding the kitchen and bedroom all would be set to 4X. This should get you started, if you need additional help please contact me at tim@osdaudio.com. TL/4818
Submitted by: Customer Service - Q&A on March 3, 2018

Steve
from Michigan asked:
February 26, 2018
hello, looks like you have everything I need/want ! I want to connect( 2) amp300 to your pre-amp. I have a turntable , an FM tuner , and cd player. I also have two sets of stereo speakers and an unpowered sub. I am new to all this , and want to know if I am going the right direction. Thanks, Steve
1 Answer
Hi Steve: The AMP300 with the Pre One are a great combination. But you will have an issue connecting your passive sub woofer unless it has an internal passive crossover. The AMP300 will be plenty to power your two pair of speakers and your multiple sources connected to the Pre One. But check out the SMP250 a dedicated Sub woofer amplifier needed to drive your passive sub woofer. It would help to know what two pair of speakers you will be driving as well as the passive sub woofer. Maybe you can let me know what components you have (Brand and model). tim@osdaudio.com, then I can be more specific. It also seems like you have a couple more input options including the fourth input on the pre one and a second input on the AMP300. TL/4817
Submitted by: Customer Service - Q&A on March 3, 2018

Barclay
from Baltimore asked:
January 11, 2018
I am currently using a pair of Bose 901 IV, can this AMP300 High Power 2-channel Stereo A/B Amplifier be compatible with the speakers?
1 Answer
HI Barclay: I looked at the owner's Manual and did not see anything that suggested this was not the perfect match for these speakers. 8 ohm and rated power between 10 watts and whatever she can see. Would recommend using 14 gauge wire. Then sit back and enjoy. Make sure to follow the setup instructions. TL/4742
Submitted by: Customer Service - Q&A on January 16, 2018

Jim Everard
from St.John's newfoundland Canada asked:
January 8, 2018
At the bottom picture it says in stock, free shipping? At the checkout there approx.117.00 shipping charge? Please e-mail your reply. Thanks
1 Answer
Hi Jim: The fine print should say free shipping to the domestic 48 US states. Canada adds additional tariffs and freight charges. Checkout purchasing from AMAZON Canada and see what they charge. TL/4735
Submitted by: Customer Service - Q&A on January 15, 2018

Michael
from Knoxville, TN asked:
December 19, 2017
I have 6 zones of speakers. Two speakers per zone wired in parallel. In each zone, the speaker wire runs through a wall plate along with a CAT6 cable down to the basement. Speakers information: Frequency Response: 40Hz-20kHz Impedance: 8 Ohms Sensitivity: 90dB 1W/1M Power Handling: 100 Watts I need an option to power all of this and control. This will be for background music. Thank you.
1 Answer
Hi Michael: You did not mention Volume Controls. So I am assuming you have no impedance protection for 6 pairs of speakers wired in parallel to 6 additional pairs, as you noted two pairs per zone through wall plates. Are the speakers wired parallel at the wall plate so you only have a single four conductor cable coming back to your central location? Or do you have have 12 four conductor cables coming back to the central location through the wall plates? So if no Impedance Matching Volume Controls you will need a speaker selector like our TSM series which has Internal Autoformers handling Impedance protection. If you only have 6 four conductor cables coming back then we would recommend using the TSM8 and connecting 6 of the eight zones. The protection is selectable: 1, 2, 3-4, 5, 6 & 7-8. You would use 6 or even 7-8. Especially if you are using the AMP300 which is perfect for your application. If you have all 12 pairs home run back to the central location then would recommend going with the TSM12 and connecting all 12 zones (2 sub zones for each of 6 main zones). The TSM 12 has selectable protection as well. 1, 2, 3-4, 5-8, 9 & 10-12. The AMP300 has no problem operating to a 4 ohm load. So let me know if that covers all your bases... Note: Hi Michael: I have read your question again and it appears you maybe running just a single pair of speakers in in each zone. If no volume controls then I still think the TSM8 would be your best choice because of the internal protection. If you have volume controls handling your impedance Matching I would suggest the DSM6 (with selectable dual source per zone). tim@osdaudio.com TL/4701
Submitted by: Customer Service - Q&A on December 19, 2017

en76
from Honolulu Hi asked:
November 28, 2017
If am using this Amplifier to run 6each either your 525 or 625 outdoor speakers, would this be able to handle all in parallel series mode without loosing any high definition nor the low end below "80hz" or do i need some kind 70v? I would prefer higher gauge than losing any definition on both high and low if need be. Am liking the spec on these 525 and 625. Possible speaker placement on concrete/medal siding, 15ft between speakers across and about 15ft to 20ft height. prefer stereo mode. Could this do the job?
1 Answer
Hi en76: The AMP300 was created just for your application. It is a High Current Amplifier that will handle down to a 2 ohm load. It features a Large Powerful Toroidal Power Supply, lots of internal capacitance, Triple Darlington Audio Section, all discrete components and ample internal Heat sink. The three pair of AP650 will actual create a 2.7 ohm load to the AMP300. Which will increase the current draw and output. The AP650 are have a frequency response 37Hz to 22kHz. You will not lose any high or low frequencies. One of the advantages of 70V is you can use smaller gauge wire for longer distances. But that is contingent on cutting out frequencies below 100Hz. This is a true audiophile Amplifier with great sound quality. I would normally recommend 10 to 12 feet apart but since you have them higher than normal that will work. The AP650 is our best selling patio speaker. Great choice on the amp and speakers. TL/4669
Submitted by: Customer Service - Q&A on November 29, 2017

William smith
from 660 harris road. Grifton NC 28530 asked:
November 6, 2017
What kind of preamps do you have?
1 Answer
Hi William: Check out our Pre One an affordable Pre amplifier that has four analog inputs including one Phone, Tape Loop, Mono /Stereo Switch and Mic Mixer. TL/4626
Submitted by: Customer Service - Q&A on November 16, 2017

ruby
from Canada asked:
September 13, 2017
How Do i connect this amp to my setup ? I had Yahama R-n301 receiver , 8 zone speaker selector, svc300 volume control. I chose yahama receiver bec I can listen to internet radio, ipad songs, network songs etc. But to power 8 zones I need amplifier. So how the setup gonna go If wanna play same song from yahama receiver in all 8 zones through amplifier. PLease let me know how to connect the yahama receiver to amplifier and and speaker selector switch (dsm8) .Should I connect switch to yahama or the amplifier. ? basically I wanna play from yahama receiver and listern in all room. please let me know how to connect the stuff. I am bit newbie. Thanks
1 Answer
Hi Ruby: The AMP 300 will be effective driving 8 external zones. The AMP 300 features both Hi and low level input. Your Yamaha Receiver really only has High (speaker) Level output so no Low Level Pre Amp output. The High level input reduces the input back to a low level pre amplified signal that is re amplifier inside the AMP300 Audio Section. In order to connect you would connect speaker wire from the Yamaha Speaker A Right and Left (+/-) to the Speaker in on the AMP300. You will need to make sure to connect the switch above to Line 2 (push to the right). The DMP8 would then connect to the Speaker A output of the AMP300. The Yamaha will then be a Pre Amplifier with all the connections you will need. It has four analog inputs and two digital inputs. Plus you will need to hard wire a network cable into the LAN connection. Please let me know if you need additional help; tim@osdaudio.com TL/4561
Submitted by: Customer Service - Q&A on September 21, 2017

Ims
from San Diego asked:
July 9, 2017
I want to run 2xOMSUB200 with 8xLS3 using a Sonos Connect. How would I wire up the speakers to this AMP? Will the Amp automatically switch on/off when I turn my Sonos on?
2 Answers
Hi IMS: I would connect your two OM Sub 200 in parallel to speaker A output from the AMP300.So with a four conductor cable like our CL14/4 wire both subs together R+, R-, L+ & L-. So you have 2 wires connected to each one of the four outputs. Next you will want to wire the 8 each (or four pair of LS3) in series parallel. Four speakers for the right and four speakers for the left. This will take a little patience and CL14/2 speaker wire. Contact me at tim@osdaudio.com so I can furnish you a diagram. Good system... TL/4461
Submitted by: Customer Service - Q&A on July 20, 2017
Note, regarding your second question the AMP300 features three turn on options: 1) Manual, using the on/off switch on the front panel 2) Connecting a 12 volt trigger to your other component like a receiver. 3) Auto Sensing, goes into stand by after 5 minutes once there is no signal. Then comes back on instantly once it sees a new signal. Note: in all cases the power switch on the front must be in the on position. TL
Submitted by: Customer Service - Q&A on July 20, 2017

Mike Karpinski
from PA asked:
August 26, 2016
Will this amp push my Cerwin Vega VS 150s ? I need more bass! My denon pma 920 isn't cutting it.
1 Answer
Hi Mike: All the reviews on the Cerwin Vega points out that you need a true power amplifier not a Receiver. The AMP 300 is a True High Current Amplifier that when you are driving a 4 ohm like like the Cerwin Vegas are rated at, you will nearly double your current demand so you are looking at the AMP delivering 200 plus watts per channel and plenty of head room. Good choice... TL/4038
Submitted by: Customer Service - Q&A on August 30, 2016

Ryan
from Oregon asked:
May 22, 2016
If I want to run 8 (pairs) of speakers with this amp and a speaker selector how do you connect the speaker selector to the Amp? Do you use speaker A and speaker B output from amp?
1 Answer
Hi Ryan: Yes, this amplifier will work for your application. You will have two options for Speaker Selectors. Option one we recommend the TSM-8 Speaker Selector that features internal Auto-Former's for speaker protection switch on the back panel. This has the best internal protection and power output when using the protection and not planning on using Impedance Matching Volume Controls for each room/zone. The second option would be to use our DSM-8 speaker selector that we would recommend using with Impedance Matching Volume Controls, one for each pair of speakers per zone. The DSM and ISS speaker selectors feature internal resistors which when enabled cuts the power handling in half (140 W down to 70 W for both the DSM-8 and ISS-8 models). So it is recommended using Impedance Matching Volume Controls to do the Heavy lifting (protection) and disable the protection on the Speaker Selector so it would be rated at 140 Watts. Checkout either the SVC-300 or VC-105 (featuring on/off switch) Impedance Matching Volume Controls Either way when you use the Speaker Selector you connect it to Speaker A only of the AMP300. TL/3893
Submitted by: Customer Service - Q&A on May 23, 2016

Pedro R.
from Rep. Dom. asked:
April 11, 2016
Hi, I want to power two OM-SUB200 and four AP-525 speakers. Which amp is best suited to power the system???
1 Answer
Hi Pedro: The AMP-300 will do a great job. You would connect speaker A of the AMP-300 directly to the first OM-SUB200 four conductor inputs (R&L, +/-) then connect a pair of the AP-525 to the four conductor output (R&L, +/-) of the OM-SUB200. Then repeat the setup with the second OM-SUB200 and AP-525 to Speaker B of the AMP300. You will be able to play Speaker A or Speaker B or both Speaker A and B at the same time. It also makes it easier to run a four conductor cable like our CL3/FT4 14/4 (direct burial) from the Amplifier to the OM-SUB200. Then run 2 conductor 14/2 to each AP-525. Also check out our Aqua Blue Waterproof wire nut connectors for terminating the Speaker Wire to and from the OM-SUB-200. This amplifier is also multi Voltage where it can be plugged into either 115V or 230V. The AMP200 would also work for your application. It features the same design but a little less power. Good choices... TL/3809
Submitted by: Customer Service - Q&A on April 11, 2016

Andy
from Ny, ny asked:
January 28, 2018
I am running 8 speakers with runs of 15 to 50 feet of speaker wire. 3 are outdoor and 5 indoor. I have a zone selector IS S8 into a Yamaha receiver RX-V373, I have added the Amp 300 but it keeps shutting off. What is the process of setting up and why does it keep shutting off?
1 Answer
Hi Andy: I did not see anything about Impedance matching Devices like our SVC300 (Indoor Volume Controls) and OVC300 (Outdoor Volume Control). If you are depending on the ISS 8 zone speaker selector and its internal protection it maybe too much so the AMP300 is shutting down. Do you notice the AMP300 getting hot to the touch? After looking at the Yamaha RX-V373 I am assuming you are connecting to the Audio Output of the Yamaha Receiver. And that you are not using the Receiver for Home Theater just the front end of your whole house audio. Please let me know more about your system. No Volume Controls and are you using the AV Receiver for two channel whole House audio only. Note, typically do not recommend using the ISS series or DSM without Impedance matching Volume Controls. And based upon what you have told me our TSM8 eight zone speaker selector with selectable protection might be a better choice. The protection on the ISS and DSM when enabled cuts your power handling in half 140 to 70 watts. So let me know; tim@osdaudio.com. TL/4775
Submitted by: Customer Service - Q&A on February 1, 2018

andy
from Anchorage, Alaska asked:
January 14, 2018
How well will this amp do driving 2 cerwin Vega xls 215
1 Answer
Hi Andy: I think it should do fine driving the single pair of Cerwin Vegas. If you think it needs more punch then you can add a second AMP300 and Bridge both to Mono so you have 435 watts per speaker. But try one first. TL/4751
Submitted by: Customer Service - Q&A on January 18, 2018

Vincent
from Wellington, FL asked:
August 27, 2017
Can you use the left output as a mono signal for LFE for a separate sub woofer amp? Also does anyone know what the delay level switch is for?
1 Answer
Hi Vincent: The output from the AMP300 is not a true LFE (low Frequency Effects). I believe you can only get that output from a AVR Receiver with dedicated LFE output. The LFE by passes the controls of a dedicated sub woofer amplifier. Most AVR output a mono low frequency signal. The Delay switch; this has to do with the time when you turn line 1 off and Line 2 comes on. It adjusts between 3 and 15 seconds. The problem is when you listen to line 1 and there is an extended silent passage the automatic source switcher will think line one has turned off and will now switch over to line 2 but as soon as the silent passage is over it automatically switches back to Line 1. The Automatic Source Switching is found on our lower end amps like the AMP120 and XMP100. The delay is less than 5 seconds and there can be issues with it switching prematurely to line 2. We added the adjustable delay to our AMP200 and AMP300 as an upgrade allowing you to set the delay up to 15 seconds. We typically recommend connecting to Line 2 input when connecting only a single source. Plus Line 2 output only pertains to whatever is connected to Line 2 input. It does not work with Line 1 input. So when you talk about connecting your sub amp it will only work for whatever is connected to Line 2 input. TL/4537
Submitted by: Customer Service - Q&A on September 11, 2017

Keith
from Baton Rouge, LA asked:
April 20, 2017
Will this amp work well with my DTR 40.6 receiver with 7.1 surround and how should I connect the speakers.
1 Answer
HI Keith: It depends on if you are using your Integra as a Surround Sound Receiver and you want to add a second zone out put to control multiple zones connecting to the ZONE 2 Pre amp output. If this is the case you would connect the Zone 2 output to the Input#2 of the AMP300. That if you are using all 7 powered channels for your Home Theater and you want to power a Zone 2 with the Zone 2 Pre amp outputs. You can connect two speakers directly to the AMP300 (Speaker A/B) and have two zones. So you will need to tell me more about what you are trying to accomplish, how many zones, how many speakers etc. tim@osdaudio.com TL/4317
Submitted by: Customer Service - Q&A on May 8, 2017

Dan
from Ontario, Canada asked:
April 10, 2017
I would like to power four pairs of in-ceiling speakers with the AMP300. Our house came wired so that there are volume control knobs in each of the four rooms with speakers. Do I need to purchase a speaker selector like the DSM4? Or could I just wire the four pairs of speakers directly into the two sets of speaker outputs on the back of the AMP300? (I.e. plug two wires into each of the speaker outputs in the back of the AMP300). Thank you!
1 Answer
HI Dan: The Speaker Selector adds more control and in some cases handles the protection of the Amplifier. It gives you the ability to turn each zone on or off as well. It usually is connecting all the wires in Parallel. In your case where you have volume controls you will need to determine if they are impedance Matching controls where they have an impedance switch (typically with settings of 1x, 2x, 4x and 8x). Four rooms with a single pair per room would mean the impedance matching setting would be 4X. And typically the Impedance matching Volume Controls are the primary choice to handle the protection. So you will need to determine if these are Impedance matching volume controls and if so what are they set at before you go to the next step. If they are Impedance matching make sure each one of the Volume Controls are set to 4X. If the Impedance matching Volume controls are handling the protection you need to make sure the protection button is off/disabled. If you are only planning a single source than you could go with the ISS4 speaker selector to save money. TL/4301
Submitted by: Customer Service - Q&A on April 13, 2017

Jason
from Dallas, Tx asked:
January 14, 2017
Is there any way to attach an IR receiver to this Amp? It's the only device I can't turn on/off with my harmony hub.
1 Answer
Hi Jason: Yes, first you need to check if your receiver has a 12 volt trigger (3.5mm connection) which you would hard wire to the 12 Volt input trigger of the AMP300. The second option is to utilize the Auto on which is a music or signal sensing turn on circuit that. In this mode the amp goes into stand by mode when there is no signal present after 5 to 10 minutes. It then comes back on when the music comes back on. I hope that helps TL/ 4180
Submitted by: Customer Service - Q&A on January 19, 2017

Mark
from San Diego Ca asked:
September 18, 2016
I need to power 12 sets of whole house speakers, each speaker is only 50watts. Can I use this amp for that system? Also, I have an 8 speaker selector currently, could I buy an additional 4 speaker selector and connect that to the Speaker B outputs and Run both the A and B speakers at the same time to get whole house audio??? I have impedance matching volume controls in each room location.
1 Answer
HI Mark: A great choice for your whole house audio. You can add the the four zone speaker selector to Speaker B. Make sure you set the Impedance matching Volume Controls to 4X on the four Volume Controls connected to the 4 zone speaker selector. You also need to determine how often you will listen to all zones at once. It is a good habit to turn the zones off at the Speaker Selector especial when not listening to a particular zone for any length of time. If you were to play four or less of the eight zones consistently you could also get away with setting impedance matching setting to 4X on the eight zones as well. The problem is most of the Impedance Matching Volume Controls (unless it is our VC-105 with dedicated on/off switch) do not have a shut off switch when you turn the knob beyond the audible listening of the zone through the respective Volume Control in the zone. Instead you have a Volume Control in the wall that is diverting your signal into the transformer and still active. If you show the discipline to shut off the zones when not in use the system will be much stabler. Good luck TL/4074
Submitted by: Customer Service - Q&A on September 22, 2016

Abel
from Texas asked:
September 12, 2016
Basically I'm running 4- 4ohm 12" subs currently powered by two amplifiers. One pair per amp, not bridged, my question is is what is the actual output of this amp at 4 ohms. I see in the owners manual, it's 235 watt per channel @ 4 ohms, is this rms or peak, yet description lists 350w @ what ohm rating is that? Is that only on two channels or x 4 channels? Current amps are 150 x 2 @ 8 ohms and 250 x 2@ 4ohms. Totally custom setup for my theater room.... Need more power....... Wondering if this amp is a worthwhile upgrade, or just stick with what I already have. Thanks for any input!
1 Answer
Hi Abel: Are you using the Infinity 1260 W Reference 12" or 1262 W? If you are using the 1260 W single voice coil I am assuming you are wiring them in Parallel and are showing a 2 ohm load to the the Amplifier or the more conservative series where you have an 8 ohm load and have cut the output of the amp in half. It sounds like you have a similar amp to the AMP300 already, what amplifier are you using (brand and model)? The AMP300 would be rated at 150 W RMS at 8 ohm and 235 RMS at 235 W. tim@osdaudio.com TL/4064
Submitted by: Customer Service - Q&A on September 22, 2016

Maynard
from CT asked:
September 2, 2016
I want to drive 4 Speakercraft Aim 8 fives with this amp. Will this amp be sufficient? I would like to also run 2 Speakercraft boom tombs off a second AMP300 - how should those be wired?
1 Answer
Hi Maynard: The single AMP300 will work just fine for the AIM 8 five's. Connect a pair to speaker A and a pair to Speaker B. I am assuming they are rated at 8 ohm and should have no problem running in parallel. Regarding the Boomtomb (times 2) you will need a dedicated sub amplifier like our SMP250 to power the Boomtomb since it does not have an internal crossover. You can start with a single SMP250 and connect both Subs in series. Each sub is rated at 4 ohm so by connecting them in series you get an 8 ohm load. Run a two conductor cable to each sub connecting the positive (red jacket) and negative (black jacket) from you component rack. At the component rack connect one of the positive to the SMP250 red output. Then connect the black (-) conductor to the red (+) conductor of the 2 conductor cable coming from the second sub. Then connect the black (-) conductor to the black output connection of the SMP250. If this is not enough output then you will need to add a second SMP250 so each Boomtomb will have a dedicated amplifier. This would be your maximum output. You will want to connect your source to the the Input #2 of the AMP300. Source could be from a Zone 2 output of a AVR or maybe SONOS Connect. The single SMP250 would connect to the Line #2 output of the AMP300. If you add a second SMP250 you would connect to the output of the first SMP250. Plus you could easily wire the speakers since both two conductors are run to the central location I would be more than happy to supply you a wiring diagram (tim@osdaudio.com) if need be. Good choices TL/4048
Submitted by: Customer Service - Q&A on September 8, 2016

Andrew Howard
from TEXAS asked:
August 31, 2016
Will this amp push 4 AP850's like a boss?
1 Answer
Hi Andrew: Run them in parallel off speaker A and drop the impedance down to 4 ohm. You will increase the current demand and get more output of the amplifier. You can run a pair of Speaker A and a second pair off Speaker B and have a little more control. Great combination. TL/4045
Submitted by: Customer Service - Q&A on September 1, 2016

Edmund Cid
from orlando asked:
June 25, 2016
I have just purchased the amp300 and ssvc4. what is the recommended connection between these two pieces of equipment knowing I have four pairs of speakers connected to the ssvc4.
1 Answer
Hi Edmund: You can use our 16/4 four conductor cable between Speaker A output on the right hand of the AMP300 back panel; Right and Left (+ and -). You connect the other end to the Source A input located on the left side of the back panel of the SSVC4. Or you can use 16/2 two conductor; one for right and the other for the left input connections. This is referred to as a Speaker (High) level connection (after the signal has been amplified) versus a signal (low) level pre-amplified signal before it is amplified (this is connection for input to the AMP 300 RCA connections from your source). TL/3953
Submitted by: Customer Service - Q&A on June 27, 2016

Joe
from Chicago IL asked:
April 27, 2016
I am planning on purchasing 6 outdoor rock speakers rated at 250 RMS each, 500w max, and I want to make sure that this can deliver enough power to them. My backyard backs up to a busy street so I need to be able to push louder music during the day. How much power can I expect to receive out of these speakers with this amp? The other option that I have is to purchase 125 RMS, 250 watt max speakers but I don't know if that will be loud enough or put to much strain on the speakers. The backyard is 50x60 with a pool. Thanks!
1 Answer
Hi Joe: Are you planning to connect the three pair of Rock speakers directly to a single AMP300? Are you planning to use Impedance Matching Volume Controls, one of our OVC300 for each pair of Rocks? The Impedance Matching Volume Controls allow you to adjust the Impedance so the Amplifier sees 4 ohm load thus increasing the current and output power of the Amplifier. Plus the volume controls will give you more flexibility in controlling the complete system You might even consider four pair of speakers and adding another Volume Control. The AMP300 weights over 40 pounds due to large Toroidal Power Supply and ample internal Heat-sink needed to handle the High Current draw. A true Audiophile Amplifier featuring total discrete components in the Audio Output Circuit with Fully Complimentary Bi-Polar Devices mounted to the Heat-sink. I would recommend using our DSM4 Speaker Selector to organize your connections with the Amplifier featuring on/off switch and A/B dual source switch per each zone. You could even go with two AMP300 driving two pair of Rocks each, 4 ohm load. Start with a single AMP 300 and see if it is enough. Good choice TL/3845
Submitted by: Customer Service - Q&A on April 28, 2016

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