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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?

    milan • 12/17/2019, 2:17:43 PM how many speakers can i hook up to this amp? how powerful can the speakers be?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Milan: It depends on you application, what are you planning? You can connect three pair of eight ohm speakers directly to A or B speaker outputs. This Amplifier is a High Current Amplifier that is 2 ohm stable. The three pair wired in Parallel would be around 2.6 ohm load. I can give you a better answer depending on what you are trying to accomplish. TL/3691
    Joe • 12/17/2019, 2:17:43 PM I'd like to get more explanation about how to use the 12V Triggers for the AMP300. I would like to control the on/off for this unit with a remote control and I assume that is how the 12V Triggers work. What is the difference between a "signal sensing" and "DC Remote trigger"? Where can I find a remote control device that will work with this unit?
    Customer Service • 12/17/2019, 2:17:43 PM
    HI Joe: The 12 Volt trigger input needs to be hardwired (or physically connected) to a component like a Receiver that would feature a 12 volt trigger output so it would send a turn on or turn off signal to the AMP300. The output 12 volt trigger on the AMP300 allows you to send a turn on or turn off signal to a second AMP300 as an example. So the 12 Volt trigger has to be wired to a component that features a 12 volt trigger output. The signal sensing or auto sensing triggers the amplifier to turn on when it senses a signal on the input side from the source (the Amplifier must have the manual switch in the on position for this to work). When it fails to see a signal after 10 to 15 minutes it goes into stand-By mode waiting for the signal to return. So check the Source or Receiver you want to connect for a 12 volt trigger output or you may have to settle for the signal sensing to do the trick. Good Luck TL/3729
    David • 12/17/2019, 2:17:43 PM I just asked a question about the MX1260 for my application. But it seems this amp might be the best choice but I need help. I have 2 outdoor speakers and 4 indoor speakers. I want to have 2 zones ( outside and inside). Each zone will have the SONOS:CONNECT connected to the amplifier so I can play two different sources at the same time or have all speakers play the same music at the same time. Will I be able to run this setup with this amp or is the MX1260 the better choice. BTW the outdoor speakers will be the AP650's and indoor will be MK650. Thanks
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi David: I have not heard from you since I responded to your first question regarding the MX-1260 versus a AMP300. The best setup would be two SONOS and two AMP200 (2) channel amplifiers. You can power the outside speakers with one AMP200 and SONOS Pre amp and power the inside zone with AMP200 with the SONOS Pre-amp #2, one pair of speakers on speaker A and the second pair on Speaker B. You can play identical source on SONOS 1 and SONOS 2 and you can control both from your smartphone or tablet. Or you can play different source material for zone 1 while playing some thing else on zone 2. The AMP200 is a workhorse and will have no problem playing as loud as you want. TL/3759
    Pedro R. • 12/17/2019, 2:17:43 PM Hi, I want to power two OM-SUB200 and four AP-525 speakers. Which amp is best suited to power the system???
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Joe • 12/17/2019, 2:17:43 PM 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!
    Customer Service • 12/17/2019, 2:17:43 PM
    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