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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
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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?

    Maynard • 12/17/2019, 2:17:43 PM 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?
    Customer Service • 12/17/2019, 2:17:43 PM
    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 ( if need be. Good choices TL/4048
    Abel • 12/17/2019, 2:17:43 PM 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!
    Customer Service • 12/17/2019, 2:17:43 PM
    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. TL/4064
    Mark • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Jason • 12/17/2019, 2:17:43 PM 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.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Dan • 12/17/2019, 2:17:43 PM 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!
    Customer Service • 12/17/2019, 2:17:43 PM
    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