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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


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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
    132 Questions asked
    Have a Questions?

    What's on your mind?

    Robert Gould • 07/09/2021, 0:53:11 AM Does this amplifier require a pre amp just want to run two speakers off of it thax
    Customer Service • 07/13/2021, 4:18:54 AM
    Hi Robert: The Pre-1 is a nice addition adding additional switching options for the AMP300. But it is not mandatory. The Pre-1 is good if you have a Turntable utilizing a Moving Magnetic Cartridge since it has a phono preamp not found in the AMP300. It also has a tape loop for adding an Equalizer, 3 other inputs, a Mono Stereo circuit, Bass, Treble, Midrange, and Loudness contour switches. It also features a 1.5 MA additional gain. Just a little more control for a pure High Current Amplifer that already has automatic Source switching between Line 1 and Line 2 inputs. TimL/OSD Tech Support 7/13/2021
    Brian Durkin • 07/25/2021, 0:17:50 AM I have a Denon AVR-x2100W receiver that has 2 zones. Zone 1 is used for my 5.1 home theater set up in my den and Zone 2 is connected to the ISS8 speaker selector box which connects directly to 8 seperate pairs of speakers. Three pairs are in wall / in ceiling speakers in different rooms in my house. The other 5 pairs are outdoor speakers set up all around my backyard (i.e. pool, fire pit, patio, hot tub, etc.) The system volume is controlled by the Denon app that allows me to select the source for each zone and adjust the volume for each zone. Everything was working great until recently, I am finding That one of the speakers of each of the pairs outside is significantly louder than the other. I am not sure if the Denon amp doesnt have enough juice to support the system or if I may have short circuited the system. I have switched the speakers around and the speakers are all good. I checked all my speaker wire connections and they are all good. Should I get the Amp 300 and connect it to the Denon Zone 2 , then have the AMP 300 feed the ISS8 so my outside zones get enough power ? I dont need individual speaker volume control & still want to use the Denon app to adjust the volume of Zone 2 with the AMP 300. What do you think ?
    Customer Service • 07/26/2021, 6:02:30 PM
    Hi Brian: None of the Japanese AVR manufacturers ever recommend powering more than a pair of 8-ohm speakers off the speaker level output, let alone a speaker selector connected to multiple pairs of speakers. The AMP300 is ideal for connecting to a Zone 2 Preamp output. No problem powering the ISS8 but note that you will need to enable the internal protection switch, especially when playing two or more speakers simultaneously. This directs the signal through the internal resistors, cutting your power handling in half, 140 watts 140 down to 70 Watts. The DENON, if used as a two-channel stereo in the Direct 2 Channel mode, would work, but when you use it, a 5.1 Home Theater Audio/Video Receiver. You are asking the common Power Supply to work overtime plus. Good Luck TL/7/26/21