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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?

    Barclay • 12/17/2019, 2:17:43 PM I am currently using a pair of Bose 901 IV, can this AMP300 High Power 2-channel Stereo A/B Amplifier be compatible with the speakers?
    Customer Service • 12/17/2019, 2:17:43 PM
    HI Barclay: I looked at the owner's Manual and did not see anything that suggested this was not the perfect match for these speakers. 8 ohm and rated power between 10 watts and whatever she can see. Would recommend using 14 gauge wire. Then sit back and enjoy. Make sure to follow the setup instructions. TL/4742
    andy • 12/17/2019, 2:17:43 PM How well will this amp do driving 2 cerwin Vega xls 215
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Andy: I think it should do fine driving the single pair of Cerwin Vegas. If you think it needs more punch then you can add a second AMP300 and Bridge both to Mono so you have 435 watts per speaker. But try one first. TL/4751
    Andy • 12/17/2019, 2:17:43 PM I am running 8 speakers with runs of 15 to 50 feet of speaker wire. 3 are outdoor and 5 indoor. I have a zone selector IS S8 into a Yamaha receiver RX-V373, I have added the Amp 300 but it keeps shutting off. What is the process of setting up and why does it keep shutting off?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Andy: I did not see anything about Impedance matching Devices like our SVC300 (Indoor Volume Controls) and OVC300 (Outdoor Volume Control). If you are depending on the ISS 8 zone speaker selector and its internal protection it maybe too much so the AMP300 is shutting down. Do you notice the AMP300 getting hot to the touch? After looking at the Yamaha RX-V373 I am assuming you are connecting to the Audio Output of the Yamaha Receiver. And that you are not using the Receiver for Home Theater just the front end of your whole house audio. Please let me know more about your system. No Volume Controls and are you using the AV Receiver for two channel whole House audio only. Note, typically do not recommend using the ISS series or DSM without Impedance matching Volume Controls. And based upon what you have told me our TSM8 eight zone speaker selector with selectable protection might be a better choice. The protection on the ISS and DSM when enabled cuts your power handling in half 140 to 70 watts. So let me know; TL/4775
    Steve • 12/17/2019, 2:17:43 PM hello, looks like you have everything I need/want ! I want to connect( 2) amp300 to your pre-amp. I have a turntable , an FM tuner , and cd player. I also have two sets of stereo speakers and an unpowered sub. I am new to all this , and want to know if I am going the right direction. Thanks, Steve
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Steve: The AMP300 with the Pre One are a great combination. But you will have an issue connecting your passive sub woofer unless it has an internal passive crossover. The AMP300 will be plenty to power your two pair of speakers and your multiple sources connected to the Pre One. But check out the SMP250 a dedicated Sub woofer amplifier needed to drive your passive sub woofer. It would help to know what two pair of speakers you will be driving as well as the passive sub woofer. Maybe you can let me know what components you have (Brand and model)., then I can be more specific. It also seems like you have a couple more input options including the fourth input on the pre one and a second input on the AMP300. TL/4817
    Rickey • 12/17/2019, 2:17:43 PM Hi my name is Rickey I am using a onkyo TX-NR676 to power my surround sound/stereo speakers in my living room. I am adding a pair Polk atrium 8's and a pair of Polk atrium 6's to my back patio. I would like to add a out door sub down the road and some bed room,kitchen speakers. I recently purchased the AMP 300 and the ISS6 with Independence matching.I am also using 100 watt volume would you recommend wiring this set up and what kind of power am i going to see to my out-door setup. Thanks in advance
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Rickey: It is pretty simple, the ONKYO TX-NR676 has Zone 2 pre amp that you would connect to the AMP input #2 using a stereo RCA patch cord. Then you need to connect to the input connector of the ISS6 from the Speaker A output of the AMP300. I am assuming you purchased one of our Whole house audio bundles with an AMP300, ISS6 Speaker Selector and 6 SVC100 Volume Controls. technically to make this work you need an impedance matching volume control for each zone you have connected. So zone one for the Atrium 8, zone 2 for the Atrium 6 , zone 3 for the kitchen, zone 4 for one of the bedrooms (usually the master bedroom). The trick is the atrium outdoor speakers should have an OVC300 outdoor volume control for each pair (unless you will be mounting the volume control inside the house). You have to run the wire from the Zone output connector (There are three dual zone output connectors; Zone 1 & 2, 3 & 4 and 5 & 6). The easiest is to use a four conductor cable like a 16/4 CL3/FT4 rated cable run to each volume control. This is a single cable with four individual color coded jacketed conductors (red, black, white and green). Then from the volume control you you connect two conductor cables like our 16/2 CL3 rated cables. One to each speaker. one right and one left both (+/-). These are color coded red and black. Now depending on how many speakers you have connected you set the impedance matching on the Volume control either 1/2x, 4x or 8x. If you were just doing the two pair of speakers you would set the Impedance matching to 1/2X. When adding the kitchen and bedroom all would be set to 4X. This should get you started, if you need additional help please contact me at TL/4818