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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
    • Less then 5 - Order Now!


      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?

    Bob • 12/17/2019, 2:17:43 PM Hello - I'm running two OMSub 200s from the B channel of my Sony receiver (100x100 watt) with two LS3 satellite speakers each on them. On channel A are the mains only. The systems works fine and the sounds is very good.  I'm looking for a little more low end "depth" to the sound and am wondering if a more powerful AMP would do it. I'm looking at the AMP 300 or the AMP 200. I'm wondering if either of these could achieve the low to medium end qualityI'm hoping to achieve. I never crank up to high volume levels as this is an outdoor deck system. Let me know your thoughts. Thank you.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Bob:I am still trying to figure out how you wired the two OMSUB200S and two pair of the LS3 and keeping your SONY Receiver happy. The OMSUB200 is a Passive Subwoofer with no internal crossover that we recommend using a dedicated Subwoofer amplifier. The Internal sub of each OMSUB200S rolls off naturally. I am assuming you connect one sub to the Speaker B left and the other to Speaker B right. That would show your SONY Receiver (either the STR-SH130 or the STR-DH-190) a 4-ohm load. That would mean you would have connected the two pairs of LS3 in series from the Receiver or connected in parallel to the OMSUB200S. I would have recommended the OMSUB200 (no S) a Passive subwoofer with built-in crossover (identical to the OMSUB200S) but it is an 8-ohm speaker with thru connections. I would recommend
    Bob • 12/17/2019, 2:17:43 PM Another possibly dumb question. Will this AMP work as a stand alone with out an Pre-Out from another source ? All I am looking to do is connect a Bluetooth receiver to a unit and play Pandora or I tunes play list from phone in an outdoor setting. At the moment, I'm thinking I need more power to drive the speakers. Thank you
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Bob:The AMP300 is a stand-alone amplifier that features Priority Source switching between two source inputs. Line 1 Input takes priority over line 2 Input (there is a variable delay switch 3-15 seconds). It also features a Line 2 output from Line 2 input. We also offer an affordable Preamplifier our OSD Prreamp1 which adds additional front end control including a Mic Mixer, 4 Inputs one of which is for a Phono connection, a perfect match for the AMP300 and AMP200.The real question, will you need this amplifier based upon your application.TL/5581
    Tim • 12/17/2019, 2:17:43 PM My name is Tim I have an amp 300 and a Rotel 6 channel amp with a B/K 3090 preamp and multiply speakers and 3 powered subs which connection is best to run through the amp300 
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Tim:I would like to no more so I could best answer your initial question. What sources are you using (New options like Wi-Fi, Bluetooth, SONOS, Google Chromcast, Apple Play, Alexa or more old school like Turntable or CD, etc.)? How many zones do have and what speakers (brand and model)? Are you looking to have a dedicated subwoofer in three different zones? How are you currently setup with the B/K and Rotel (both excellent components)? Are you presently using Volume Controls?Inquiring minds would like to know; tim@osdaudio.comTL/5589
    Kyle S. • 11/05/2020, 0:11:30 AM Hi! Noticing that there are only peak wattage figures posted, I'm wondering what RMS output wattages are at both 4ohm and 8ohm. Thanks!
    Customer Service • 12/08/2020, 3:44:47 AM
    Hi Kyle: This High Current, High Power Amplifier is rated at 135 watts RMS at 8-ohm, 235 Watts RMS at 4-ohms; 350 watts max output. And 470 watts bridged Mono (one channel connected). The features a Heavy Duty Toroidal power supply, Plenty of reserve Capacitance, all discrete components (no ICs in signal path) and Ample internal Heatsink to help with the increased heat created by the High Current demand. Pure Class AB. Stable down to 2-ohms. I don't know who changed the bullet points (Max power) but check the specs in the AMP300 Owner's Manual. TL/12/8/20
    Ron B • 04/16/2021, 2:21:37 PM Can i hook up a EQ between the cd player and the amp?
    Customer Service • 04/28/2021, 3:23:00 AM
    Hi Ron: Typically a EQ has an input (from the CD player) and a output (that would go to the Amp300). Check out our Pre-1 which allows you to add multiple sources and utilize the Tape Monitor Loop which has a Play (output) and Rec (Input). So when you press the Tape monitor button it activates the tape loop so the EQ works with whatever source is selected. TimL/4-28