300-Watt (150w RMS x 2) Studio Audio Amplifier
    Product # 605030
    300-Watt (150w RMS x 2) Studio Audio Amplifier
    Product # 605030
    In Stock This item should ship tomorrow (10/28/2016) if ordered within 14 hours 33 minutes

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    300-Watt (150w RMS x 2) Studio Audio Amplifier

    Add 300 watts of clean and stable power to your studio rack using this 300-Watt Studio Audio Amplifier from Monoprice!

    This rack-mountable switching Class D amplifier packs 300 watts of power into a compact form factor, which takes up only 1U of rack space. It can be used as a stereo amplifier or can be bridged for mono mode.

    In stereo mode it produces 150 watts per channel RMS (300 watts per channel peak) into a 4-ohm load or 100 watts per channel RMS (200 watts per channel peak) into an 8-ohm load. When driving a 2-ohm load, it can produce 250 watts per channel RMS (500 watts per channel peak). When bridged for mono mode, the amplifier produces 500 watts RMS (1000 watts peak) into a 4-ohm load and 360 watts RMS (720 watts peak) into an 8-ohm load. Additionally, it is stable when using reactive or mismatched loads, so for example, you can connect a 2-ohm speaker to one channel and an 8-ohm speaker to the other without any problems.

    It features an extremely flat 20Hz ~ 20kHz (+0, -1dB) frequency response with less than 0.05% THD+N and more than 96dB signal-to-noise ratio. Built-in protection circuitry includes full short circuit, open circuit, thermal, ultrasonic, and RF protection. It also features power on/off muting function to prevent popping in the speakers when power is turned on or off. There is also a selectable limiter, which serves as a brick wall on volume to prevent high volume levels from driving the amplifier into clipping, which can cause speaker damage.


    • Class D amplifier
    • High current switching power for high power output, low noise, and low distortion
    • Extremely flat 20Hz ~ 20kHz (+0, -1dB) frequency response with less than 0.05% THD+N
    • Balanced 1/4" TRS and XLR inputs
    • Unbalanced 1/4" TS and NL4 speaker twist speaker outputs
    • Built-in optional limiter helps prevent clipping
    • Short circuit, open circuit, thermal, ultrasonic, and RF protection
    • Stable with reactive and mismatched loads
    • Power on/off muting function
    • Separate gain controls for each channel
    • Signal and clipping LEDs for each channel
    • Power and protection LEDs
    • Bridgeable for high-power mono operation
    • 1U height
    • Includes rack mount ears
    Power Specifications (Tolerance ±5%)
    Stereo Mode (RMS/Peak)
    (Both Channels Driven)
    2-ohm load 2x 250W/2x 500W
    4-ohm load 2x 150W/2x 300W
    8-ohm load 2x 100W/2x 200W
    Bridged Mono Mode 4-ohm load 1x 500W/1x 1000W
    8-ohm load 1x 360W/1x 720W
    Electrical Specifications
    Input Sensitivity (Limiter Off) 0.9 ~ 1.1V (±1 dBv)
    Input Impedance 20 kilohms balanced or 10 kilohms unbalanced
    Frequency Response
    (at 10dB Rated Output Power)
    20Hz ~ 20kHz (+0, -1 dB)
    Voltage Gain 28 ±0.5dB
    (Ref. 1kHz, 12.5% Rated Power, A-weighted)
    < 0.05%
    Signal-to-Noise Ratio
    (Ref. Rated Power, A-weighted)
    > 96dB
    Crosstalk (Below Rated Power) > 70dB
    Damping Factor (1kHz @ 8 ohms) > 180
    Power/Output Circuitry Switching Power Class D
    General Specifications
    Protection Features Full short circuit, Open circuit, Thermal, Ultrasonic,
    and RF protection; stable into reactive or mismatched loads;
    power on/off muting
    Controls Front: Power on/off switch, Channel 1 level, Channel 2 level
    Rear: Stereo/Bridge switch, Limiter on/off switch
    LED Indicators Green signal for each channel, Red clipping for each channel
    Blue power, Red protection
    Input Connectors 1/4" TRS balanced, XLR balanced
    Output Connectors 1/4" TS unbalanced, NL4 unbalanced
    Input Power 110 ~ 120 VAC, 50/60Hz ±10%
    Dimensions (WDH) 19.0" x 11.1" x 1.7" (483 x 281 x 44 mm)
    Weight 8.2 lbs. (3.7 kg)

    6 Reviews

    91.67% of the reviewers recommend this product



    • JT,
    •  Los Angeles, CA 
    • 8/12/2016 11:26:06 AM

    Pros: Can't beat the price.
    Definitely powerful up to 20Khz / high end.
    Pretty light for mobile applications (8 lbs)

    Cons: Internal fan is VERY noisy. If they could upgrade the fan (or better just heatsink and make it noiseless) I'd probably be willing to fork over another $50. I would replace fan on my own but I wouldn't want to void the warranty.
    Also the chassis is a little too deep for the portable rack I am filling.

    Great Price. Sonically this amp seemed just a tad crispy to me, the high end sizzled a bit too much, though this could considered a good thing, maybe it's just giving a better represenation of my mixes and I need to cut my top end a little. Definitely brighter sounding than the Carvin DCM200L that it was meant to replace. Unfortunately the fan noise on this monoprice amp is a deal breaker for me so I will be returning it. If you are racking your amp in a separate machine room then go for it!

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    Great Value

    • Matt,
    •  Omaha, NE 
    • 5/25/2016 1:48:41 PM

    Pros: Clean, powerful, and can't beat the price.

    Cons: The original fan is too loud

    I bought the amp to power an old set of B&W speakers for studio monitor. The amp performs wonderfully. The sound is crisp and clear even at full volume.
    To solve the fan noise issue, I replaced the original fan with a 12db computer fan for $8.

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    Good Amp for my passive studio monitors

    • NKTulsa,
    •  ,  
    • 5/18/2016 8:09:28 AM

    Pros: Clean sound, excellent value for money

    Cons: None I could think of.

    I purchased the 300-Watt (150w RMS x 2) Studio Audio Amplifier for my Kustom Passive Monitors. It was a great deal and works great!

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    Versatile 1U Power Amp

    • Uncle Stevec,
    •  Vancouver, WA 
    • 4/11/2016 2:09:44 PM

    Pros: 1U, light, powerful, flexible, bridgeable.

    Cons: None so far.

    I was looking for a 1U power amp to put into a slant rack PA case for a small portable system. For the small venues I expected to use the system for the power rating on this amp would work well. I wound up putting two (2) of them in the case along with an equalizer. The 2nd amp can work as either a backup for the powered mains, power the passive monitors, or to drive a small sub-woofer if needed. So far they have run extremely cool running monitors at 8 ohms. Bought a third just to have in the rack of a larger PA system that uses powered mains and 4 channel power amp for monitors. As I'm using these amps for live sound the relatively minimal fan noise (it's nothing really) is irrelevant. For the "mono"price I just couldn't resist....

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    Great amp for the price

    • Jeff,
    •  riverside, CA 
    • 8/25/2015 11:45:51 AM

    Pros: Loud, nice to have choice of 1/4" & xlr for inputs, speakon & 1/4" outputs.

    I use this to power my guitar cabinet, 4-12" speakers. It works great, really pushes the air. As for fan noise, not a concern in my environment. If you need a PA amp for monitors, keybds, or a digital guitar rig, this is a great alternative.

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