QSC RMX850 Amplifier Amplifiers

QSC RMX850 Amplifier Amplifiers 


Two-channel audio amplifier


RMX 850

STEREO MODE, EIA: Both Channels Driven
8 ohms EIA 1 kHz, 0.1% THD
4 ohms EIA 1 kHz, 0.1% THD
2 ohms EIA 1 kHz, 1% THD
8 ohms EIA 1 kHz, 0.1% THD
4 ohms EIA 1 kHz, 1% THD
Signal to Noise, 20 Hz-20 kHz
100 dB
Distortion (SMPTE-IM)
Less than 0.01%
Input Sensitivity @ 8 ohms
1.15v (+3.4 dBu)
Voltage Gain
31.6x (30 dB)
Output Circuitry
Power Requirements
1/8 power pink noise at 4 ohms *
5 A
35 lb (15.9 kg) net
Distortion (Typical)
20 Hz-20 kHz: 10 dB below rated power
1.0 kHz and below: full rated power
Less than 0.03% THD 4 and 8 ohms
Frequency Response 20 Hz-20 kHz, +/- 1 dB, -3 dB points: 5 Hz-50 kHz
Damping Factor, 1 kHz and below Greater than 300 at 8 ohms
Input Impedance 10 k ohms unbalanced, 20 k ohms balanced
Input Clipping 10 Vrms (+22 dB)
Cooling Continuously variable-speed fan, rear-to-front air flow
Connectors, each channel Input: Active balanced; barrier strip, XLR and 1/4" (6.3mm)
TRS tip and XLR pin 2 positive
Output: touch-proof binding posts and Neutrik Speakon
Controls Front: AC switch, Ch. 1 and Ch. 2 gain knobs
Rear: 10-position DIP switch
Indicators Power-On: Green LED Signal: Yellow LED (1 per channel)
Clip: Red LED (1 per channel)
Amplifier Protection Stable into reactive or mismatched loads
Load Protection On/off muting, AC coupling
Dimensions 19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 rack spaces),
15.9" (40 cm) deep (rack mounting to rear support ears)
Power Requirements 100, 120, 230 VAC, 50-60 Hz
* @ 120VAC, both channels driven; multiply current by .5 for 230V units


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[Sep 23, 2007]


Great neutral sound at an economy price. Remarkably low distortion. Great headroom. Great choice of speaker connectors in the rear. Short height. Stackable.


No remote control. Rack mounting ears are not removable.

I bought this amplifier to drive a pair of custom-built dipole systems. The systems sounded great at the lab. But always veiled and somewhat muddy at home. Some other dipole afficionados said I needed more headroom than the 120 watts I was driving them with. My first test of this amplifier was with an OPPO dvd player, playing CDs in stereo. The OPPO is supposed to have some great DACs in it. And I had tried the same setup with the integrated amplifier I subsequently returned because it didn't perform to my expectations. To use it with an A/V receiver, you need preamplifier-outs on the receiver.
For headroom (peak limits), this amplifier is a tough act to follow ... 320 watts at 8 ohms ... 480 watts at 4 ohms ... and 688 watts at 2 ohms. It's as musical as the original ... adding nothing, taking away nothing. It reproduces a piano, a full orchestra, opera, transients, flawlessly. It's neither warm nor cool. It's neutral. It's revealing in that I can discriminate instruments in the orchestra as well as I can at a live performance.

Fan noise is minimal unless you're next to it. To get the unit's full performance, you have to disable the low-frequency filters and the clipping controls with the dip switches provided on the rear of the unit. Connecting cables make a difference. Musical instrument cables didn't seem to perform as well as audio interconnect cables. I settled on 1/4-inch to RCA adaptors and regular audio interconnect cables. Although it's only a two-channel power amplifier, it weighs the same as most 7-channel integrated receivers. It doesn't even get warm after several hours of use.

Customer Service

Haven't used.

Similar Products Used:

Many high end pre-amplifier, power amplifier, integrated amplifier, and A/V amplifier systems.

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