If you are visually impaired and are having difficulty navigating this site, please call our Customer Support line via our toll free number 1 (877) 271-2592.
    Monoprice 300-Watt (150w RMS x2) Studio Audio Amplifier
    Product # 605030
    Out of Stock ETA: 10/18/2018


    Due to limited supply, all products are sold on a first-come first-serve basis.  Auto Notification does not guarantee either availability or price. All prices are subject to change without notice.

    *Your information will only be used to notify you when this item becomes available.

    Volume Pricing (Log In to see Member Pricing)

    Volume Pricing

    Qty: 1 $99.99
    Qty: 2-9 $99.99
    Qty: 10-19 $99.99
    Qty: 20-49 $99.99
    Qty: 50+ $99.99

    To see and take advantage of our member pricing sign up for a business account or contact our sales team.

    Learn more about Monoprice Business


    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)

    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 10 questions Browse 10 questions and 21 answers
    Is it possible to get the user manual for this?
    A shopper on Feb 6, 2018
    BEST ANSWER: yeah, it comes with user manual. Awesome amplifier... I love it, and it's a great price for it.
    Please help. I ordered one of these amps. but need to bridge it to a mono-4 ohm subwoofer that uses unbalanced connections. The receiver the amp is receiving a signal from is unbalanced also, and mono. What is the best way to connect this amp? I planned to send the signal from the sub output of the receiver, through a Harrison FMOD 70 hz low-pass filter, into the amp, and then to the sub. Thanks in advance for any technical advice.
    Reginald W on Aug 29, 2017
    BEST ANSWER: Thank you for your interest in this amplifier. You can use an RCA to 1/4" TS or RCA to XLR-M cable to the input of channel 1 on the amp. Switch to bridge mode. You will need a 4-pole NL4 connector. Wire positive lead to the 1+ terminal and the negative lead to the 2+ terminal of the NL4 connector. Connect NL4 to channel 1 speaker output.
    Monoprice 4-pole NL4 Female Speaker Twist Connector
    Monoprice 4-pole NL4 Female Speaker Twist Connector
    Monoprice 10ft Premier Series XLR Male to RCA Male Cable, 16AWG (Gold Plated)
    Monoprice 10ft Premier Series XLR Male to RCA Male Cable, 16AWG (Gold Plated)
    My amp is coming tomorrow. I plan to use it in bridged mono mode for a high power, high excursion, (16mm Xmax.), 4 ohm subwoofer. The input from the receiver to the amp will be limited to frequencies 70 hz and below through use of a Harrison FMOD. since the inputs and outputs are not typical, any advice on how to connect it properly? I have not seen any instructions on the correct or safest way, and am electronically literate and handy. Please give advice, thanks in advance.
    A shopper on Aug 29, 2017
    BEST ANSWER: Thank you for your interest in this amplifier. You can use an RCA to 1/4" TS or RCA to XLR-M cable to the input of channel 1 on the amp. Switch to bridge mode. You will need a 4-pole NL4 connector. Wire positive lead to the 1+ terminal and the negative lead to the 2+ terminal of the NL4 connector. Connect NL4 to channel 1 speaker output.
    Monoprice 4-pole NL4 Female Speaker Twist Connector
    Monoprice 4-pole NL4 Female Speaker Twist Connector
    Monoprice 10ft Premier Series XLR Male to RCA Male Cable, 16AWG (Gold Plated)
    Monoprice 10ft Premier Series XLR Male to RCA Male Cable, 16AWG (Gold Plated)
    Is this for a 70v system?
    A shopper on Nov 28, 2017
    BEST ANSWER: No, this uses standard 8 or 4 ohm speakers. I am using it in a bridged mode to drive speakers for chimes at our church. I am using the bridge mode to increase the power in mono as I did not need stereo.
    Can this amp power 6 ohm speakers?
    A shopper on Jul 21, 2017
    BEST ANSWER: I don't think it would be problem because the documentation says it can deal with a 2 OHM load.
    I have two of these amplifiers and I made two assumptions connecting them. I can clearly see signal on the inputs but, not on the out put so I need to check my assumptions since they are not mentioned in any documentation or support materials. 1. That the product is not limited to 1/4 input to 1/4 output or XLR input to NL-4 output and I can use 1/4" TRS inputs and NL-4 outputs? 2. The proper pinout for NL-4 connectors being used in stereo is +1/-1? I will try 1/4 output connectors with 1/4 input connectors as soon as I have some but, would like to know what I am dealing with in the meantime. Tim
    A shopper on May 13, 2018
    BEST ANSWER: the NL4 and 1/4" speaker outputs are wired in parallel. Both should be working simultaneously with either the TRS 1/4" or XLR inputs. ch1 & ch2 NL4 should be wired +1/-1 for each. You can also use 1 NL4 connector for both ch1&2 inputs wired as +1/-1 & +2/-2 plugged in to the ch1 output.

    If this is not the case you may have a defective unit.

    Please login to your Monoprice.com account. From there on the left hand side, under my account, you can go under request refund/replacement and from there you can process setting up and obtaining your replacement item. I hope this helps. Thank you!
    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.
    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.
    Can anyone give instruction on the new fan installation?
    Victor H on May 23, 2018
    BEST ANSWER: Not sure what you mean by new fan. If you are talking about a mod we do not offer a service manual. We do not recommend opening the amplifier. There are no user serviceable parts inside.
    Does this amp run in constant voltage or constant current? Constant Current is preferred for anything needing punchy sound, constant voltage sounds totally lifeless.
    A shopper on Feb 18, 2018
    BEST ANSWER: This amp runs constant current.
    4.7 / 5.0
    21 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    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
    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
    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
    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
    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
    Great vlue
    Just like everybody said it is noisy but for a rock and roll band you don't notice it!
    May 24, 2017
    1 year ago
    Studio Audio Amplifier
    So far so good. I've only had it a couple weeks but it's been completely reliable. I have a friend who also couldn't resist it at the price and he is happy as well.
    October 16, 2017
    12 months ago
    Decent amp, loud and strange cooling
    Well made, lots of power, pro inputs and outputs (no phono or banana plugs for in/out here - look at the pictures), so be prepared to buy or make adapters if this is your first audio amp with pro connectors. I bought on sale at around $80, and it was a worthwhile purchase.

    Weird (and LOUD) cooling. The cooling fan is angled so that it uses the vents at the bottom of the case. But this is a piece of rackmount gear, which means it will likely be installed directly on top of another piece of rackmount gear, or put on a shelf, and the bottom vents will be TOTALLY blocked. Not sure what they were thinking here.

    Mine will be on a shelf, and I will install rubber feet to give the bottom vents some air.
    October 18, 2017
    12 months ago