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    SKU: OSD-AMP300

    OSD AMP3002-Channel 350W Per Channel, High Current Class A/B Stereo Amplifier Toroidal Transformers

    Purchase 2-Channel 350W Per Channel, High Current Class A/B Stereo Amplifier Toroidal Transformers - AMP300
    • Outdoor Speaker Depot SKU: OSD-AMP300 stereo-amplifer
    • In Stock


      Compare at: $665.99
      You Save: $316

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    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.

    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.

    Warning: California's Proposition 65


    This product can expose you to chemicals, including vinyl chloride, which is known to the State of California to cause cancer. For more information, go to

    • Design Type: Class A/B
    • Peak Power Output: 350 Watts per channel
    • Maximum 8 ohm stereo output power at less than 0.2% THD+N: 150W
    • Maximum 4 ohm stereo output power at less than 0.2% THD+N: 235W
    • Maximum 8 ohm Bridged-Mono output power at less than 0.2% THD+N: 470W
    • Frequency Response: (20Hz to 20kHz) +0.0dB, -0.5dB
    • Impedance: 8 ohm to 2 ohm stable
    • Signal to Noise Ratio: -103dB referred to rated power at 4 ohms
    • Turn on options: manual on, signal sensing, and 12V Trigger mode
    • Unique Automatic Dual Source Priority Switching with Speaker Level Input Option
    • Automatic source switching
    • High Output Toroidal Power Supply, High Capacitance and Ample Internal Heatsink
    • Input and Output Terminals: Interrupting line input, main input/output, 12V trigger, speaker zone A output, speaker zone B output
    • Rack Mountable: Yes
    • Dual Source Switching: Yes
    • Dimensions (Lx H x D): 16.5" x 5.25" x 14"
    • Weight: 40 Lbs
    • Warranty: 2 years
    136 Questions asked
    Have a Questions?

    What's on your mind?

    Hank • 12/17/2019, 2:17:43 PM What is the true continuous power output per channel RMS of this amp, two channels driven at 8 ohms?
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Robert • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Travis • 12/17/2019, 2:17:43 PM 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?
    Customer Service • 12/17/2019, 2:17:43 PM
    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? TL/5215
    Timothy Rogers • 12/17/2019, 2:17:43 PM 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
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Hal • 12/17/2019, 2:17:43 PM 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!
    Customer Service • 12/17/2019, 2:17:43 PM
    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