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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|
|Input Sensitivity (Limiter Off)||0.9 ~ 1.1V (±1 dBv)|
|Input Impedance||20 kilohms balanced or 10 kilohms unbalanced|
(at 10dB Rated Output Power)
|20Hz ~ 20kHz (+0, -1 dB)|
|Voltage Gain||28 ±0.5dB|
(Ref. 1kHz, 12.5% Rated Power, A-weighted)
(Ref. Rated Power, A-weighted)
|Crosstalk (Below Rated Power)||> 70dB|
|Damping Factor (1kHz @ 8 ohms)||> 180|
|Power/Output Circuitry||Switching Power Class D|
Full short circuit, Open circuit, Thermal, Ultrasonic,
and RF protection; stable into reactive or mismatched loads;
power on/off muting
Front: Power on/off switch, Channel 1 level, Channel 2 level
Rear: Stereo/Bridge switch, Limiter on/off switch
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)|
PROS: Loud, nice to have choice of 1/4" & xlr for inputs, speakon & 1/4" outputs.
PROS: Slim design
CONS: Noisy for a "studio amp.
No Banana connectors on back.
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
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?!
PROS: Clean sound, excellent value for money
CONS: None I could think of.
PROS: 1U, light, powerful, flexible, bridgeable.
CONS: None so far.
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.