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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?

    Michael • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    CJ • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Kenny Bailey • 12/17/2019, 2:17:43 PM buyer has to pay return shipping? thanks
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Jor • 12/17/2019, 2:17:43 PM Can I hook up an Onkyo TX-8050 to this amp and how?
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Mark • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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