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Home / Product Category / Outlet Center / CLEARANCE / Amplifiers / OSD Audio AMP120 High Performance 2-channel Stereo Amplifier with Dual Source Switching, 75W x 2, 160 Watts Bridged Mono Output

OSD Audio AMP120 High Performance 2-channel Stereo Amplifier with Dual Source Switching, 75W x 2, 160 Watts Bridged Mono Output

Product code: OSD-AMP120

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Features & Specifications

One of our most popular power amplifiers, the AMP120 is a compact but powerful dual source stereo amp that drives two pairs of speakers (8 ohms) and features dual source switching. Many of our customers add this efficient stereo amplifier to their existing Dolby Surround Sound Systems to bump up the power and improve the overall sound quality, or to power up backyard or patio sound systems with passive speakers. Serving up high power with a small foot print that fits easily under a cabinet or on a patio bar shelf, the AMP120 has features that you just won’t find in this price range.

Dual Source Listening Flexibility

The AMPS120 is dual source capable for greater listening flexibility. What this means is that you can connect two audio sources and toggle between them with the addition of an RCA-to-mini stereo cable (sold separately). Connect your smartphone or other device to source 1 to stream music from your phone or switch to source 2 connected to your laptop’s full digital audio library. Automatic source switching is another nifty feature that automatically switches between connected sources with a priority signal-sensing feature. If your iPhone is connected to input 2, then you decide to stream a movie through a game console, when the console is turned on, the AMP120 will automatically switch to that source.

The AMP120 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 160 Watts (8 ohms). When playing dual sources, switch to stereo mode which reduces the power to 75 Watts per channel.

Price-defying Features

A quality amplifier can have a profound impact on the sound you hear, and the AMP120 does not disappoint. This amp is refreshingly straightforward. The clean, brushed metal front panel includes 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. The rear panel includes an Auto On feature that when set, will automatically power on the amp when a signal is sensed and power it off when a signal is not sensed. Special protection circuitry is designed into the AMP120 to safeguard the amp from a short circuit, and the rear panel includes 5-way speaker wire binding posts that accommodate both bare wire and banana plugs.

The AMP120 offers 75 watts RMS per channel of power, with bridgeable outputs for up to 160 watts RMS. A, B, or A+B speaker selector switches make managing connected outputs easy and line 2 also offers a powered line out for connecting a subwoofer to your secondary source.




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50 Questions & 51 Answers
from LA asked:
October 10, 2018
Can this amp push 2 volume controls run with 4 conductor wire and 2 speakers on each volume control run in 2 conductor? Looking at running four AP640's with two volume controls pushed by amp120. Thanks!
1 Answer
Hi Nic: We have discontinued the AMP120. Its direct replacement is the XMP100 which is also less money and will work better for you application as well. The four conductor CL3 16/4 is ideal for connecting Amplifier to the Volume Controls. Speaker A to the first Volume Control and Speaker B to the second Volume Control. Note just like the AMP120 the XMP100 A/B speakers switches can both be pushed in at the same time to play both A and B at the same time. The difference is the XMP100 will play both A and B at the same time (4-ohm load) whereas the AMP120 had issues when playing less than an 8-ohm load. If you are using Impedance matching Volume Controls the setting for both would be 1/2X. The VSK120 (non-Impedance matching, Resistor based version) will work for this application as well. They would show a 4-ohm load to the XMP100 in your application (and arguably sound better). Good luck TL/5237
Submitted by: Tim Leahy on October 11, 2018

from Pittsburgh asked:
April 5, 2018
Will this amp power a pair of ap850s?
1 Answer
Hi Robert: The AMP120 would not be the best match for the AP-850. It is a chip amp that does not have a lot of head room. The best choice and value would be the AMP200 and add a second pair of AP-850 to drop the amp down to a 4 ohm load doubling the output power. Not only is this amp a High Current Power Amplifier but is stable down to 2 ohm. It weights 24 pounds versus 9 pounds for the AMP120. The AMP200 is considered a true Audiophile quality amp. The AMP120 is an application amp recommend to drive one pair of 8 ohm speakers at a time. No comparison...step up to AMP300 and more than double the power. TL/4891
Submitted by: Tim Leahy on April 17, 2018

from New York asked:
February 28, 2018
Hi, i am getting a Denon x4300h receiver with 9 channels of amplification. I need to add a 2 channel amp to it for a 7.1.4 setup. Would this be a good amp for that purpose? Thank you.
1 Answer
HI Jay: I believe the XMP100 would be a better choice for your application. We will be adding an XMP200 as well with double the power in the next couple of months. TL/4825
Submitted by: Customer Service - Q&A on March 3, 2018

Dale Den Herder
from Macungie PA asked:
February 16, 2018
I have a Pioneer cassette deck model CT 822 that I currently have playing through a Samsung HW-J550/ZA soundbar that is also hooked up to a 55" Samsung TV model J5700 TV but the signal from the tape deck is weak ...will this amp act as a push to the sound bar to bring the volume up on the soundbar ?...thanks in advance...Dale DH ?
1 Answer
HI Dale: I do not think this AMP120 will work for you application. What you need is our newest revised Pre One Pre amplifier which will feature a 1.5V output. Our original Pre One only has a .5V so not enough to make a difference. The new one will be in stock in about 60 days, Mid April. TL/4807
Submitted by: Customer Service - Q&A on February 16, 2018

from Virginia Beach, VA asked:
January 10, 2017
I recently ordered (2) 600TTWRS speakers and would like to know if this amp will drive them and if so, how you recommend wiring them to the amp.
1 Answer
Hi Brandon: The basic amp for your application we would recommend our new XMP100 a new Class D 2 channel stereo power amplifier with automatic source switching. Although similar to the AMP120 (a class A/B chip amp) it is more stable when running two pair of 8 ohm speakers. Pushing in speaker A and Speaker B buttons at the same time. The speaker you have selected the ICE600TTWRS although a single Dual Voice Coil speaker it is equal to a pair of 8 ohm speakers. So when you are listening to both speaker A and Speaker B at the same time you have both speakers connected in parallel so the load is half of 8 ohms or 4 ohm load. Due to the efficiency of the Class D amplifier at 93% versus the AMP120 class A/B; 50% there is less heat generated by the additional current draw of 4 vs 8 ohm. The XMP 100 is our newest amplifier and we are so excited about how well it works we are looking to add bigger version of this amplifier with more power. I hope these answer all your questions. Thanks for considering OSD Audio. TL/4174
Submitted by: Customer Service - Q&A on January 12, 2017

from Indianapolis, IN asked:
March 22, 2012
Can I connect my Ipod directly to this amp? If so, how? AP
1 Answer
Hi AP, The Amp120 features two RCA signal level inputs which are dual female RCA connectors for both Input #1 and Input #2. Marked as red for right and white for left. Input #1 takes priority when both are connected and active. When you shut off the source for input #1, input #2 plays. You have two options for connecting your iPod directly to one of the two inputs. The first option you will need is a mini 3.5mm to RCA adaptor cable (see RCA audio cables under the audio/video cables tab). The mini 3.5 connector is plugged into the headphone output of your iPod then the RCA's are connected to one of the inputs of the AMP120. A second option would include adding an iPod docking station such as the Sherwood DS-10 (Go to category/whole- house audio systems/iPort In-Wall Docking Station for iPod/DS-10). This connects to the AMP120 with a standard RCA to RCA patch cord (R&L stereo). You plug your iPod into the dock and not only does it charge the iPod but it also allows you to control the iPod functions with the remote control supplied with the DS-10. When connecting just a single input to the AMP120, use input #2, which features a dedicated pre-amp out that allows you to add a powered subwoofer like our P10. Thank you for considering OSD products. TL/MA
Submitted by: Customer Service - Q&A on March 22, 2012

C John
from DC asked:
October 23, 2017
Hi. Does this amp allow for assigned zone speakers? I have 2 bathrooms with 1 dual voice coil speaker and 1 Bluetooth in-wall receiver in each. The RCA out from each in-wall receiver is sent to a single stereo amp with A/B selectable zone speakers and dual source auto sensing. Everything works, but I am not able to assign speakers to each source. I have to select which zone is active to get music in that specific bathroom and NOT the other. If I have both zones active, then I have music in BOTH bathrooms (disturbing whoever is in the other room and doesn't want to hear anything). I'd like to assign one speaker zone to one input source so that I don't have to physically press the button every time depending on which bathroom is being used. Is this possible with this amp, or do I need to have 2 separate amps to achieve this? Thanks
1 Answer
Hi C John: Based upon what you described you would need a second amplifier to make this work. I am assuming you have two seperate Bluetooth Receivers that do not sync together. So you need a dedicated amplifier for each source. TL/4603
Submitted by: Customer Service - Q&A on October 24, 2017

bob blank
from Maryland asked:
June 23, 2017
Hi, My neighbor says its a little loud for one speaker facing her house, can I bring down the db by placing a resister inline with the speaker. I am an engineer but I don't really work with electronics
1 Answer
HI Bob: How many speakers are you powering with the AMP120? Stereo I am assuming hopefully not bridged Mono. It sounds like you are playing a couple of pair of speakers with the AMP120. Can you add an OVC300 Outdoor Volume Control to connect to a right and left stereo pair, the speaker you are wanting to control and its stereo pair speaker so the volume can be controlled for both? Let me know more about your setup TL/4438
Submitted by: Customer Service - Q&A on June 25, 2017

from San Francisco asked:
November 28, 2016
The auto on sensing does not seem to be working. The back switch is set to auto-on and the front power is set to on. However, the amp will not turn off . I'm assuming it's not off because the front light is lit, it's humming, and it's warm. It remains on even when no music is being played or the RCA inputs are disconnected completely. It works fine while on but won't turn off in auto sensing mode. . This is the case for both of my amps. Any help is would be greatly appreciated.
1 Answer
Hi Ryan: I believe the turn off occurs around 15 minutes after no music or signal is present, not instantly. It comes back on instantly when connected to input #1 and after a short delay on input #2 (as long as input number one is not active or connected). If you connect a single input we recommend using Line 2. Line 2 output is a thru put for line 2 input. So you could connect a powered sub woofer to Line 2 but would only play what is connected to Line 2. If you wanted to connect a powered sub woofer for both line input #1 or Input #2 then you would have to connect to speaker level (speaker B output). You would also need to make sure the Powered Sub had a Speaker (high) level input. Please let me know if this helps... TL/4136
Submitted by: Customer Service - Q&A on November 28, 2016

from US asked:
September 19, 2016
Hi there, I recently purchased an OSD AMP120 via Amazon Canada, and received it yesterday. I'm experiencing an issue where I'm hearing an audible "pop" or "click" from the connected speakers when watching movies or TV that I'm hoping you'll be able to help me with. Here are some details on how my amp is connected: The amp being used to power surround back (rear) speakers in my home-theater setup. It is connected via RCA cables from my receiver's analog output (Denon X4000) to the amp's Line 1 inputs. The speakers are connected via banana plugs to Speaker A. Amp is set to Auto ON, and in Stereo mode The volume of the amp is set to around 75% (3 o'clock position) During quieter moments watching either movies or TV, I hear an occasional pop sound from the surround back speakers. Sometimes, I will hear this pop several times within a short time (within a minute), and other times, it works normally for several minutes. This did not happen when the speakers were previously connected to the internal amp of the Denon receiver. Have you ever encountered this issue? And can you suggest how this problem cal be resolved? Thanks for your support. Terence
1 Answer
Hi Terence: I believe you are having issues with the AMP turning on and off during silent passages. Try connecting the Denon to Input #2 on the AMP120. Then set the Auto On to Normal. You will need to turn the amplifier on and off when you are using to play your surround channels during a movie but the popping noise should not come back. TL/4075
Submitted by: Customer Service - Q&A on September 19, 2016

Mohamed Faizal
from Dammam,Saudi Arabia asked:
August 2, 2016
Do you have any distributor for your products in SaudiArabia. if yes please give their details Regards,
1 Answer
HI Mohamed: Thank you for your interest in OSD products? Are you end user or dealer? We have an International Sales manager who I sent your contact information to; they may be contacting you. TL/4007
Submitted by: Customer Service - Q&A on August 3, 2016

grady childers
from richmond tx asked:
January 23, 2016
do you make a amp.that has blue tooth.can you hook your I phone to this amp.
1 Answer
Hi Grady: We do not currently offer a Bluetooth Receiver that could be connected to the AMP120. We are looking for future options to add Amplifiers with Bluetooth built in or a stand alone Receiver that would work with all of our current Amplifiers. Keep checking back with us... Thank you TL/ 3670
Submitted by: Customer Service - Q&A on January 25, 2016

from boston asked:
June 8, 2015
Can I plug I microphone into this amp? I am looking for a setup to announce little league baseball games.
1 Answer
Hi Tony, Not directly into this amp. This amp will only accept Line level or speaker level input.
Submitted by: Customer Service - Q&A on June 9, 2015

from WI asked:
April 30, 2015
I ahve an onkyo receiver with 2 outputs. I use one for the theater and i am wondering if i can use the second output connected to an amp that is then connected to my multiroom selector to run 3 zones? Is that a crazy thought?
1 Answer
Hi Jason, If your receiver has a pre-amp out or zone 2 out that uses RCA then you can definitely do this. But you would need to run a stronger amp like our AMP200 or AMP300. The AMP120 can only handle playing 1 pair at a time. It's a very common setup for someone to run their home theater receiver into an amp, then the amp to the speaker selector which is connected to the speakers.
Submitted by: Customer Service - Q&A on May 1, 2015

from Indonesia asked:
April 13, 2015
Hello, I'm looking for an inexpensive way to put a couple of speakers out by the pool. This amp seems to be a good solution. This is a holiday rental place, so I would like the system to be as simple as possible. Music either coming from the living room stereo, or from 3.5mm jack nearer the pool. The auto switching sounds great, easy to use. Can you recommend which of your outdoor speakers would work best? They can be mounted under a roof, so don't need to be waterproof. Though generally weather resistant is a good idea. I will keep the amp inside a bedroom by the pool area. And use one of your outdoor volume controls for the volume. Which model is the correct one to order with this amp and speakers? Thanks for your time
1 Answer
Hi Damon, I would definitely recommend our AP650 patio speaker pair! Great sound for a reasonable price of $149.95/pair. You can run the OVC100 outdoor volume control as well.
Submitted by: Customer Service - Q&A on April 15, 2015

from Wisconsin asked:
March 9, 2015
From everything I am reading, if I want to use 2 sets (4) of your RS670-JR's and have them playing at the same time only using one source, I can not do that with this amp, correct. This amp will only do one set of speakers at a time, but not both correct???
1 Answer
Hello Jim, The AMP120 was originally advertised to be able to run both zone A and B simultaneously. This however led to some issues as the amp would start to get hot when both zones ran together for extended periods. Eventually we reworked the amp to run zone A or B, not A and B. Technically the amp can still run A and B simultaneously if both buttons are pushed at the same time, but it is not recommended and would be considered misuse. We recommend our AMP200 to safely run 2 or more pairs of speakers.
Submitted by: Customer Service - Q&A on March 9, 2015

from Nashville, TN asked:
January 17, 2015
I have two 6ohm speakers rated at 130watts each. This amplifier cannot bridge and handle 3ohms, so that means I would have to use them in the 6ohm configuration. Would this be sufficient power for these speakers? Does that mean they would get around 60RMS per speaker?
1 Answer
HI Austin: Do you mean you have a pair of 6 ohm speakers or 2 pair (or four individual speakers)? If you have a pair of 6 ohm speakers this amplifier will provide a little more than its rated power (rated at 50W). The lower impedance 6 ohm versus 8ohm will draw a little bit more current. This is OK for a pair of speakers especially rated at 130 watts. Hopefully your speakers sensitivity is 89dB or higher so they are efficient (taking less power to drive them). You can connect a second pair of 6 ohm speakers to speaker B output but this amplifier will not allow you to push both A and B speaker buttons at the same time. So if you can live with playing just A or B then it will work (assuming you meant 2 pair). Another option depending on your budget is to step up to the AMP200. This is a High Current Amplifier that is stable down to 2 ohm and a much better sound quality. I hope that helps TL/3104
Submitted by: Customer Service - Q&A on January 25, 2015

from Australia Perth asked:
November 20, 2014
Hi I am interested in Purchasing one ASD-AMP120 but before I do need to be sure it can do what I want it to. Solve - 1 Does the line input on 1 work with Speaker out A and Line Input 2 with Speaker output B = all independent. in order to play 1 meadia on A and a diferent media on B Solve - 2 Or does Line A & B work as a pair meaning the same output?
2 Answers
Hi Alfred, Actually the AMP120 can only play one zone at a time. So you can either play A or B, but not A and B. The same goes for the sources...either Line 1 or Line 2, but not simultaneously. The only amp we carry that you can do multi-source at the same time is our MX1260, which has 6 zones and each zone can either have its own source or one source altogether for all zones.
Submitted by: Customer Service - Q&A on November 26, 2014
Hi Alfred, Actually the AMP120 can only play one zone at a time. So you can either play A or B, but not A and B. The same goes for the sources...either Line 1 or Line 2, but not simultaneously. The only amp we carry that you can do multi-source at the same time is our MX1260, which has 6 zones and each zone can either have its own source or one source altogether for all zones.
Submitted by: Customer Service - Q&A on November 26, 2014

from New York, NY asked:
October 26, 2014
Does this unit have an auto on and off feature?
1 Answer
Hi Anthony, Yes - You can see on the picture of the back of the amp, there is a switch for Auto or Normal.
Submitted by: Customer Service - Q&A on October 28, 2014

William Rick
from 68516 asked:
August 21, 2014
When I push in both A and B buttons at the same time, the 2 buttons will not come back out. If you push one down, it will pop the other one out, but if you push both down, you cannot get them to pop back out. This is my second amp and both have the same issue. I want to use it for A OR B, OR BOTH. It is now stuck on Both and buttons will not release.
1 Answer
Hi William, The AMP120 uses this mechanism to protect it from being misused. It can only run a single zone at a time, either A or B but not both A and B at the same time. You can pop the buttons out by removing the top of the amp. On the PC board behind the buttons, there is a tiny metal tab that if push to the right with a small screw driver or pen, will release the buttons. If this does not work it may need to be returned for repair.
Submitted by: Customer Service - Q&A on August 26, 2014

from Bethesda, MD asked:
July 21, 2014
Is the OSD-AMP120 what I need to run three pairs of in-ceiling Klipsch 1650 speakers that each have On-Q lyriQ AU5009 keypads? The speaker 's maximum power is just 35 watts RMS (140W peak). The On-Q controls have 2 on-board class D amplifiers but aren't impedance matching. I'm confused by the low power ratings of the speakers versus the need to power three sets. Looks like the OSD AMP200 would deliver too much power? Do I also need a DSM4 speaker selector with amplifier protection to do the impedance matching?
1 Answer
Hi Alan, The AMP120 can only handle 2 pairs of speakers actually. The AMP200 would be a better bet - you can control the output power using the master level volume controls on the back of the amp. The AMP200 will put out about 125 watts per zone, so if you run a 6 speakers off Zone A, you'll have about 20 watts going to each speaker. You can always run 4 speakers off Zone A and 2 speakers off Zone B to get more wattage into each speaker. You can do the DSM4 or ISS4 to give you 4 controllable zones, each with on/off capability and impedance matching, but the AMP200 can handle down to a 2 ohm load per zone anyways, so impedance matching isn't necessary here.
Submitted by: Customer Service - Q&A on July 22, 2014

from york, SC asked:
July 21, 2014
Will the OSD-AMP120 drive a pair of Polk Atrium 60 outdoor speakers? I have no limit on the outdoor and will be able to crank up the volume. Will it be clear at low and high volume? Is there an amplifier like this that has USB port for streaming spotify from my laptop?
1 Answer
Hi Doug, The AMP120 will run about 50-60 watts per channel depending on whether it sees an 8ohm load or 4ohm load. It should do the job for you, but there are more powerful amps, such as our AMP200. No, just RCA inputs for your source. You can run a 3.5mm to RCA cable from the headphone jack on your laptop.
Submitted by: Customer Service - Q&A on July 21, 2014

from Long Island, New York asked:
July 15, 2014
Im looking for an amplifier to power a pair of Bose Free Space 51 outdoor speakers (40 watts at 4 ohms each) plus a an outdoor subwoofer ( OM sub 200). Could this amplifier handle that? If not what would you recommend? Also how would you wire the subwoofer?
1 Answer
Hi Jim, This may not be the best amp to use, as it can only handle down to a 4ohm load in total. Since you have 4ohm speakers, adding on the sub would lower that impedance load to around 2ohms or so, which wouldn't be stable for the AMP120. It would be best to run the AMP200 in this case, but if you are on a budget, the AMP150 could possibly work.
Submitted by: Customer Service - Q&A on July 16, 2014

from Long Island, NY asked:
June 28, 2014
Hi - I have this connected to an Onkyo HTRC260 receiver using zone 2 line out. I can only control the volume from the amp but since the amp doesn't have IR I have to physically go to it every time to do so. How can I get the volume to be controlled from the receiver?
1 Answer
Hi Dan, That would all depend on the type of signal output from the receiver. Some outputs are static and the volume will not affect it. Check with the maker of your receiver to see what your options are. Thanks.
Submitted by: Customer Service - Q&A on June 30, 2014

from Montreal asked:
June 20, 2014
Hi, Could you please recommend an amp for the following. Would the AMP120 be sufficient? I m looking for an amplifier to play music on 2 sets of 2 speakers, separately (A&B) or at the same time (A or B). The speakers are Reference Audio RAW 5, with the following specs: 50Hz-20kHz Sensitivity: 89dB Impedance: 8 ohm Maximum Amplifier Power: 120 watts Thanks Eric
1 Answer
Hi Eric, If you want to have the ability to run both sets of speakers simultaneously but with different sources, I believe what you'll need is something like the SW-RX4105 or SW-RX5502. Our OSD brand amps can only run one source at a time but will give out more power than the too aforementioned receivers.
Submitted by: Customer Service - Q&A on June 20, 2014

from Charlotte, NC asked:
May 21, 2014
Am I able to bridge 2 RS790 speakers with the AMP120, one on Chanel A, and one on channel B? If A & B are both on will both speakers work? Will the each receive 150 watts? If not, is there a more efficient way to use both channels to power the two speakers at a higher output than just using one channel?
1 Answer
Hi Brian, I believe only one zone works in bridged mode. If you need more power, you'd have to step up to the AMP200 which is a high-current amp. BM 2704
Submitted by: Customer Service - Q&A on May 22, 2014

from Brooklyn, NY asked:
May 16, 2014
Can I hook this amp up to a speaker selector? I'd like to use zone 2 from my receiver for three pairs of room speakers. One room is the kitchen and the next is the Livingroom. At no time would more then two rooms be on at a time and it's just for background music not crazy volume. Here is my planned setup. 1. Pre amp RCA from receiver 2. Amp 3. Speaker selector 4. Volume control 5. One 2ch in ceiling speaker kitchen 6. One pir of small bookshelf speakers in living room 7. Backyard speakers wired directly to the powered zone 2 from receiver. Ideas?
1 Answer
HI Shaun, This amp unfortunately won't work for your application, as it can only run a pair of 8 ohm speakers on each of the 2 zones. What will work for your setup is our AMP200. It's a high current amp that can handle up to 3 pairs of speakers on each of the 2 zones or a speaker selector. Let us know if you have further questions. Thanks. BM 2685
Submitted by: Customer Service - Q&A on May 16, 2014

from Long Island NY asked:
May 4, 2014
I have an Onkyo RC260 receiver with one pair of line out connections for its second zone. I need to power 4 pairs of 8 ohm speakers (no more than two pairs at at time max). The AMP120 only does two. Could I use the line out on the AMP120 to daisy chain two AMP 120s together? Would I be able to control which speaker pairs were on? Thanks!
1 Answer
Hi Dan, Yes, you can run the 1st AMP120 directly off the receiver and then run the 2nd AMP120 from the Line out of the 1st. You can choose whether you want A, B, or A + B active. Another option would be to just run a single AMP200. BM 2660
Submitted by: Customer Service - Q&A on May 5, 2014

Dan S
from Long Island NY asked:
April 12, 2014
Hi - Wanted to check if this setup makes sense.. I have an Onkyo receiver with a second zone and a set of preamp out jacks. I was planning on getting the AMP120 and the ATM7 speaker selector to power the following: a set of 8 ohm ceiling speakers in my dining room and another set in my study and a set of outdoor speakers (haven't bought them yet). I would only run one of those pairs at a time, the in ceiling pairs would only be used for light background music and the only set where I would need any significant sound from would be outside. I also can't run volume control selectors at all. Are the AMP120 and ATM7 the right choices for the job? Thanks!
1 Answer
Hi Dan, Very good question. Typically the ATM-7 is used in applications where up to 7 pairs of speakers are running, but that doesn't mean it needs to run that many zones. However, with the AMP120 powering it, you can power one pair of speakers off the ATM-7 at a time, but I wouldn't try running two pairs at a time as that would drop the load to 4ohms or below and that could affect the AMP120. Let us know if you have any further questions. Thanks! -BM 2607
Submitted by: Customer Service - Q&A on April 14, 2014

from az asked:
April 5, 2014
I'm a little confused about the output capability of this amp. I see that thus amp is rated at 60W RMS per channel x 2 = 120W, but has a total of 4 speaker outputs (Channel A R+L, Channel B R+L). And in the manual it says that it can be run with A+B (4 total speakers) at the same time. So if I have 4 8ohm speakers hooked up and run A+B together, will I get 60W output to all 4 speakers? Or will the power be split between A and B giving me just 30W RMS per speaker?
1 Answer
Hi James, If you run both A + B together the load will drop to 4ohms, giving you 60 watts into each speaker. The higher the db sensitivity of the speaker, the more volume you will get per watt, so for best results, try using speakers with 90+ db sensitivity. Hope that helps! Thanks. -BM 2597
Submitted by: Customer Service - Q&A on April 10, 2014

from Vegas asked:
March 21, 2014
I would like to have an amp that will power 4 pairs of speakers like the RX550 using a speaker selector with volume control like the SSVC4. Will this little amp do that? My goal is to have a SONOS powered system, so I was thinking of using the SONOS connect with this amp. Would the SONOS connect amp drive all of these speakers and eliminate the need for this amp?
1 Answer
Hi Jim, The AMP120 or the SONOS connect would not be enough to power 4 pairs of RX550's. I recommend going with the AMP200, or the AMP300 if you plan on adding more speakers in the future. CS 2553
Submitted by: Customer Service - Q&A on March 24, 2014

Alan Piazzi
from MIAMI asked:
March 16, 2014
I bought 4 pair of AP640 High Performance OSD-AP640wht 6.5" Patio Speakers I want to now by 4 single RS800 rock speakers for a total of 12 speakers. I would like to buy a AMP120 amplifier and a OSD-ISS6 speaker selector to control 6 different zones. I would like these speakers to all be on at the same times some of the time. Will this set up work? TX
1 Answer
Hi Alan, Yes that set up will work. I would recommend getting the AMP200 so you have some more power for your speakers as the AMP120 may not be enough for 12 speakers. CS 2541
Submitted by: Customer Service - Q&A on March 17, 2014

from Texas asked:
March 9, 2014
I have a Vizio TV with only one output source. I want the TV and two sets of exterior speakers to be connected. I want the ability to turn off the TV sound and to determine which set of exteriors speakers that I want sound to come from. Can this system do that?
1 Answer
Hi Sherry, You will be able to connect your TV to the AMP120's input as a source, then run 2 pairs of speakers from the AMP120. You will be able to connect each set of speakers to channel A or B and switch between those channels to choose which speakers you want to use. CS 2527
Submitted by: Customer Service - Q&A on March 10, 2014

from Triangle, Virginia asked:
February 18, 2014
I am considering purchasing the dual in wall subwoofer (IWS-88) along with an amplifier. If I bridge this amp to a mono signal @ 8 ohms, will it provide enough power to run the subwoofer efficiently?
1 Answer
Hi CG, You can power the IWS-88 subwoofer with the AMP120 but it wouldn't sound right because the AMP120 doesn't have the crossover to separate the lows from the highs. It won't damage the woofer, but it just won't sound great. The SMP250, when back in-stock, will be the perfect amp to run this subwoofer with. Thanks! -BM 2493
Submitted by: Customer Service - Q&A on March 5, 2014

Bobby Brown
from Virginia asked:
December 11, 2013
I have a only RC 360 receiver.I have 5 of OSDs ICE 850 hooked in a 5.1 sub yet. I have 3 Polk audio RC6 s in ceiling stereo speakers in my dining room....upstairs hall and upstairs bath. My question is what do I need amp and or speaker selector wise and would I really need a amp 200 to supply three stereo speakers. Thank you for any imput.
1 Answer
Hi Bobby, Running a single stereo speaker (dual tweeter) is similar to running a pair of speakers, thus you are running a load that is equal to 3 pairs of speakers. The AMP120 is really only built to handle a pair of speakers on each zone, and that is even putting a lot of stress on the amp, as it is intended to run one zone at a time. Thus, I would definitely recommend the AMP200 in your application. -BM 2390
Submitted by: Customer Service - Q&A on February 11, 2014

from Singapore asked:
December 8, 2013
1. For the Line 2 Out, is it a variable line out such that it's volume is affected by the volume control? I would like to connect my subwoofer to it. 2. The wall power socket in my region gives 230V at 50 Hz. do I need a transformer/adapter to use this?
1 Answer
Hi Edwin, 1- No the line 2 output is a fixed output in a loop with line 2 input. 2. The power requirements for the AMP120 are 120VAC 60Hz 4.2A so you would need an adapter to run the amp at 110-120V
Submitted by: Customer Service - Q&A on March 6, 2014

from Southern Cali. asked:
July 30, 2013
I am putting in a 7.1 system and want to use this amp to power my two other rooms for a whole house audio setup. If the two other rooms each have 2 speakers in them, will this amp be able to power the 4 additional speaker simultaneously? Also what will be the power output to each speaker with that setup? Thanks!
1 Answer
HI Kevin: The AMP120 has an A and a B speaker switch. It is not recommended playing both at the same time. If you press A in the B switch pops out and vice a versa if you press B, A pops out. This is an Amp that works best at 8 ohm (one pair of speakers playing at a time). When both speakers are playing the load drops down to 4 ohm and increases the current demand which cause the amplifier to heat up. You can press both switches in at the same time so both A and B can play at once but we do not recommend this for this series of AMP's (the AMP60 and AMP120). We would recommend stepping up to the AMP200 which is built more for your application where you can run two speakers all day long and would be a better choice if you choose to add additional rooms or zones. You might also consider adding Impedance Volume Controls to your two zones. TL-2111
Submitted by: Customer Service - Q&A on August 21, 2013

Craig Christophersen
from Kalispell, Montana asked:
June 24, 2013
I have 2 OSD dual tweeter AP550TT speakers. Can I use this amp to run them from my laptop audio jack?
1 Answer
Hi Craig, Yes, the AMP120 will power two AP550TT patio speakers. To connect your laptop, you can purchase one of our RCA to mini cables: CL/MA 2010
Submitted by: Customer Service - Q&A on June 27, 2013

from Canada asked:
May 13, 2013
I have a simple turntable to play my albums (yes I am over 50) and two old honken big speakers. I am simply looking to connect the turntable and the speakers to the AMP120 and rock it that simple?
1 Answer
Hello, Without knowing the specifications of the speakers, it’s hard to say whether it is simple. If you’re connecting one pair of speakers with 8” woofers, the AMP120 should suffice. However, a more suitable amp may be the AMP200 (again, depending on the specifications of the speakers). If the speakers are 8" or smaller, you could also go with a basic receiver made by Sherwood. Take a look at the RX4105. CL/MA 1891
Submitted by: Customer Service - Q&A on May 18, 2013

from Yardley ,PA asked:
May 9, 2013
I would like to place this unit in my sun-room. The Temps in this room can easily reach 90+ degrees during the summer. Also I will have a pair of rock speakers each with about 60 feet of wire. I have doubts that I can use the OSD-Amp120 for this configuration do to the heat. Please advise if I can use this or if there are other options. Thanks...
1 Answer
Hi Scott, The AMP120 is 50 watts RMS with bridgeable outputs for 150 watts. If your rock speakers fall into this range, the amp will work fine. The amp will need to be well ventilated, particularly on hot days. Cooling fans for amplifiers are available and have been used in car stereo installation for decades. For runs 80 feet or under, we recommend 16-gauge wire. CL/MA 1880
Submitted by: Customer Service - Q&A on May 15, 2013

from kansas city,mo asked:
April 27, 2013
If I buy the AP525 Outdoor Music All in One Bundle OSD Audio, can I add the Outdoor Speakers Rock RX640 OSD Audio Pair to the system and run both pairs at the same time? Thanks
1 Answer
Hi Mike, The AMP120 amplifier is designed for one pair of speakers at a time. If you want to use both pairs of speakers at the same time, consider the AMP200 amplifier. We can substitute the amp in the bundle if you would like to pay the difference in cost. Please call to place that order 562-697-2600 CL/MA 1836
Submitted by: Customer Service - Q&A on April 29, 2013

from Greenville, South Carolina asked:
April 24, 2013
I have a pair of TIC ASP120 6.5" speakers that are 8ohm and 75w RMS. Can I bridge the A and B channels for these 2 speakers to up the power?
1 Answer
Hi Josh, We do not recommend doing this. There is a bridge mono switch on this amp; however, if you run two speakers in parallel, the impedance will drop from 8 ohms to 4 ohms. Your could wire them in series but you won’t get the power you need from the amp. We recommend buying a second amp, particularly our AMP120 for your application. CL/MA 1826
Submitted by: Customer Service - Q&A on April 24, 2013

from New York asked:
April 18, 2013
I have a 7.1 , 2 zone Yamaha receiver with 7 in-wall speakers connected for my basement home theater , also 4 additional ceiling speakers for the rest of the basement . The 4 additional speakers are connected into zone 2 of the receiver which is not putting out enough power to drive the speakers so I know I need a separate amplifier also I'm looking to get 2 subwoofers for the basement , one for the theater and one for the other 4 speakers . My basement is around 1200 sq . Please any suggestions on the amp and subs and the best way to set it up .
1 Answer
Hi Christian, If you would like to run both pairs at the same time, go with our AMP200 connected via an RCA output or from your powered zone 2 output into the speaker level input on the AMP200. The PS10 subwoofer is a very popular unit, but if you are looking for something compact our new PS88 home theater sub is a dual 8-inch and a great choice as well. CL/MA 1810
Submitted by: Customer Service - Q&A on April 19, 2013

from Outer Banks, North Carolina asked:
April 17, 2013
I have a set of two Polk Audio Atrium 45's that I'm looking to mount under a second floor deck. I'd like to wire these to it's own power source/volume control, and will primarily be used with an ipod, and potentially using an airport express down the road. I would like to keep the amplifier outdoors permanently in an outdoor kitchen area that's covered by a tin roof. It looks like it'd be easy enough to plug an ipod docking station in or a 3.5 mm to RCA cord. Is this adequate for my needs power wise? It sounds like it's fine to keep outside as long as it's protected? Should I be looking at something different?
1 Answer
Hi Dan, The Amp120 has RCA inputs and a simple cable will connect any of the sources you mentioned. Using an indoor amp outside can be done if the area is covered, dry, and protected from the weather. We also recommend covering the amp with a plastic tarp or cloth when not in use. CL/MA 1808
Submitted by: Customer Service - Q&A on April 18, 2013

from long island, ny asked:
April 11, 2013
Can this amp be left outside? I'm trying to hook up a couple of speakers outdoor for my deck and I can't run wires from an indoor receiver so looking for something I can basically just leave outside. Thanks.
1 Answer
Hi Pat, As long as your deck is enclosed and the unit will not be exposed to direct weather elements, you could leave it outside. Consider using a plastic dust cover when it’s not in use, so it’s protected. Feel free to consult with us on the other sources you’re using with the amplifier. TL/MA-1793
Submitted by: Customer Service - Q&A on April 12, 2013

from Walled Lake, MI asked:
March 26, 2013
In reference to: You can push both buttons in at the same time. You just have to make sure not to overdrive the speakers while both A and B are playing. This Amplifier likes to see an 8 ohm load which is what it sees when one pair of eight speakers are connected to either A or B. When you play both A and B at the same time you have both speakers connected in Parallel which drops the impedance down to 4 ohm. If you play the speakers at better than half volume for an extended period you put a strain on the amplifier. As a safeguard they design the switches so that when you press one in the other pops out and vice versa. Then we tell you have you can play both at the same time while making sure not to overdrive the speakers. TL - 1734 If I hook two 8ohm speakers in series (effectively 16ohm) to a bridged channel does it drop the overall ohms to 8? If so, can I play both A+B on "bridged" mode?
1 Answer
Hi Ben, You only have single bridged output (+/-), not one for A and one for B. It is only the two positive outputs from Speaker A. You could wire both speakers together in series parallel and have single positive and minus connection to the bridged output of the AMP120. You would be limited to playing both pair of speakers at the same time but unable to play either or. We can provide you with a diagram for this connection. Other options include purchasing the AMP200 and you won’t have a problem running your two pair of speakers at the same time. TL/MA-1738
Submitted by: Customer Service - Q&A on April 1, 2013

from Walled Lake, MI asked:
March 25, 2013
When I depress the B speaker switch, A pops out...when I depress A, B pops. How do I get them both to play?
1 Answer
Hi Ben, You can push both buttons of the amp in at the same time. Make sure not to overdrive the speakers while both A and B are playing. This amplifier likes to see an 8-ohm load which is what it sees when one pair of eight speakers are connected to either A or B. When you play both A and B at the same time, both speakers are connected in parallel which drops the impedance down to 4 ohm. If you play the speakers at better than half volume for an extended period, you’ll put a strain on the amplifier. That’s why we design alternating switches, to protect customers from overdriving the speakers. TL/MA 1734
Submitted by: Customer Service - Q&A on March 26, 2013

from Excelsior, MN asked:
March 20, 2013
Will this power one dual coil speaker and one additional pair of 8 ohm speakers.? I bought this and am wondering if I bought the wrong amp for my set up?
1 Answer
Hi John, This Amp120 amplifier should no problem running both of the speakers at moderate levels (60%). You will notice when you push speaker A in the Speaker B button pops out and vice versa. This was done to discourage operating both speakers at the same time. You can push both buttons in at the same, but you do not want to drive the speakers too hard. You might consider choosing speakers that have a sensitivity of 91dB or better as they are more efficient and take less power to drive. TL/MA 1719 1721
Submitted by: Customer Service - Q&A on March 20, 2013

from Mtl asked:
February 27, 2013
I am buying 4 amp 120 to do multi room. Each one will be driving one pair of speaker and will be connected to an airport express. I need three pairs of ceiling speaker(witch model should i take for best result) Bridged or not? 6" 1/2? I also need one pair of outdoor speaker? (Patio wall mount) Thanks vv
1 Answer
Hi W, A solid choice for your in-ceiling speakers would be the 6.5 inch ICE640 speakers. Run them as stereo pairs (not bridged). For the patio speakers, look at the AP640 either white or black. TL/MA 1666
Submitted by: Customer Service - Q&A on March 3, 2013

from Mtl asked:
February 2, 2013
Is this amp good to drive one pair of ceiling speaker? (6")
1 Answer
Hi Vv, Yes, the OSD Audio AMP120 would be a great amplifier for driving one pair of 6.5-inch speakers. CL/MA 1604
Submitted by: Customer Service - Q&A on February 4, 2013

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