300-Watt (150w RMS x 2) Studio Audio Amplifier
    Product # 605030
    300-Watt (150w RMS x 2) Studio Audio Amplifier
    Product # 605030
    $115.99
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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.

    Features:

    • 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
    Specifications
    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
    THD+N
    (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)
    4.6 / 5.0
    7 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    4
    3
    0
    0
    0
    Great amp for the price
    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.

    PROS: Loud, nice to have choice of 1/4" & xlr for inputs, speakon & 1/4" outputs.
    August 25, 2015
    Great Value
    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.

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

    CONS: The original fan is too loud
    May 25, 2016
    Good Amp for my passive studio monitors
    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!

    PROS: Clean sound, excellent value for money

    CONS: None I could think of.
    May 18, 2016
    Versatile 1U Power Amp
    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....

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

    CONS: None so far.
    April 11, 2016
    Pretty Decent Amp
    If you're looking for an amp to power a good size control room or office, this one is worth a look. The slim 1 space rack design is perfect for those situations where space is a premium. It powers my 2way 8" passive JBL monitors quite well. Price is outstanding....it's, well, Monoprice! That being said, the unit cools down with fans instead of heatsink, which makes it a bit noisy compared to typical higher end studio amps. Also a bit frustrating that the rear connectors are speakon/neutrik and 1/4". Had to do a little wire clipping and soldering to hookup my speakers. Both the fan and the connectors suggest that this amp is not made for studio, but small venuepossibly for highs in a tri-amp situation. Bottomline: if you're in a critical listening environment, this is probably not the amp for you. It's no old school Hafler Amp. But if you've still got some passive studio monitors hanging around and you can put up with a little noise and speaker connectivity issues, this is a decent amp at a great price. This amp is in my backup listening environment and will do a fine job there.

    PROS: Slim design

    Decent power

    Good price

    CONS: Noisy for a "studio amp.

    No Banana connectors on back.
    August 12, 2015
    Make this amp nicer by replacing stock fan with...
    I actually bought two 605030 for $66 each at the 10/22/16 local MP Warehouse Sale. Fan was too noisy for the way I was going to use them. I purchased 4 Enermax T.B.815 (also 80x80x15mm) 18dBA fans, 2 3-pin Y Adapter Bare Wire and 2 3 to 2-pin Adapter (type D, to match the amp's fan only connector) from "CoolerGuys" and installed 2 fans in each amp. Stock fan was 2-pin & 0.34A. These T.B.815 are 3-pin & 0.20 (so 2 of them are almost the same as the factory one, FYI). Of course, I used the one included bracket for the 1st fan then used 4 small (4") black plastic ties to secure it to the other available 'vent' at the bottom. I barely hear it now and the amps remain very cool indeed even when running them at relatively high (8 ohm load, for the record) volume. My amps are in a HT setup, with rubber feet below, etc. so the tiny protrusion underneath from the plastic ties remains 99% invisible and don't bother me at all. I do have a rack, I actually tested both there first, and just by pushing the amp slightly down I was able to install it temporarily using 4 10-32 rack screws with another component right below. I wish I could include a couple of pics to better show/ilustrate the work but it's not an option here, sorry. I paid under $20 average for each amp and got free shipping because I took advantage and bought some other stuff I needed and reached the minimum needed. Conclusion: I am MUCH happier now with the amps noise level and still 'cool performance'!

    PROS: price paid, 1 rack slot, lightweight...

    CONS: for a 'Studio' amp I wished it had RCA inputs and even binding posts for the speakers...asking too much?!
    November 4, 2016
    Reasonable
    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!

    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.
    August 12, 2016
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    Browse 2 questions Browse 2 questions and 3 answers
    I'm looking for a cost effective way to power two 15", 4 ohm sub-woofers in my home theater. I guess the amp is not stable to two ohms when brided so, Bridged and running my speakers in series should give me 360 watts RMS at ohms. MY A/V receiver will set the crossover point during setup. Will this amp handle the Job?
    A shopper on Nov 27, 2016
    BEST ANSWER: First off, the amp has a cooling fan so it's going to be a little noisy for audio applications. As far as bridging the amp, I don't think this amp will produce 360 watts. I got one and I believe it's 150 watts per channel into 8 ohm. In bridged mode you'll probably get upwards of 300 watts. I ran mine bridged into a 10" coaxial driver and it pumps pretty good. I'm not sure how well it would handle sub frequencies though. It's not a real expensive unit though and you could return it if it doesn't work out I guess.
    I have a closet for my components. Will I be able to hear the fans if I close the closet door?
    A shopper on Nov 28, 2016
    BEST ANSWER: The fan is fairly quiet. Should be inaudible behind a closet door. If it starts to get too hot the fan will go faster and may be louder. Possibly due to running high volume (so you probably won't hear it anyway) or the amp needs more air.
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