QSC RMX850 Power Amplifier

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Product Description

The QSC RMX Series Power Amplifiers are an impressive combination of a rugged, high-output design and the latest circuit technology that's made to deliver unmatched performance at an affordable price!
The QSC RMX850 Power Amplifier has balanced XLR and 1/4 inch TRS inputs. Outputs include binding posts and Neutrik Speakon connections. These stereo power amps are only 2 rack spaces tall and 15.9 inches deep. Other features include ultra low distortion (.05% THD), a low-noise variable speed fan with rear-to-front air flow to keep your amplifier and racks cool, and selectable low-frequency filters to protect your speakers and increase headroom. QSC power amps are backed by a 3-year transferable warranty.

Purchase an RMX Series Amplifier from AMS and Recieve QSC's
QSC 6 Year Extended Warranty
after registering your product at QSC.com

Get the clean, dynamic power with the legendary QSC sound quality and reliability that pros depend on.

Muscular Power Plant
The power supply is the heart of an amplifier, converting raw AC power from the wall to clean DC for the audio circuitry. The RMX uses a powerful high-current toroidal transformer and ample filter capacitance to ensure generous energy reserves. This makes a critical difference in sound quality, allowing the amp to effortlessly punch out high level transients, even when driving abusive 2-ohm speaker loads.

Superior Performance
RMX amplifiers deliver true studio-quality sound. A full complementary output circuit using the highest-grade linear output devices delivers ultra-low distortion (<0.05% THD) & a ruler-flat frequency response. SMT (Surface Mount Technology) triples small-signal component density, enabling QSC to pack more power in a smaller chassis than their competitior's design. And unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling & cooling.

Comprehensive Features
The RMX Series is packed full of professional features that increase performance and flexibility:
  • Independent defeatable clip limiters reduce distortion without sacrificing peak performance
  • Selectable low-frequency filters boost system response, protect speakers and ensure low-end tightness by more precisely matching the amplifier's range to the loudspeakers
  • Barrier strip, XLR and 1/4 inch balanced inputs plus Speakon and binding post outputs provide easy connections
  • Low-noise variable speed fans with rear-to-front air flow keep amplifiers and racks cool

Product Specifications


RMX 850

RMX 1450

RMX 2450

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




Bridge Mono Mode


8 ohms EIA 1 kHz 0.1% THD




4 ohms EIA 1 kHz 1% THD




Signal to Noise (20 Hz-20 kHz)

100 dB

100 dB

100 dB

Distortion (SMPTE-IM)

Less than 0.01%

Less than 0.01%

Less than 0.02%

Input Sensitivity @ 8 ohms

1.15v (+3.4 dBu)

1.15v (+3.4 dBu)

1.23v (+4.0 dBu)

Voltage Gain

31.6x (30 dB)

40x (32 dB)

50x (34 dB)

Output Circuitry



Class H

Current Consumption (1/8 power pink noise at 4 ohms @ 120VAC,
both channels driven; multiply current by .5 for 230V units.)




Weight (Net)

35lb. (15.9 kg)

40lb. (18.2 kg)

44.5lb. (20.2 kg)

All Models

All Models

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
Less than 0.03% THD 4 and 8 ohms

Frequency Response

20 Hz-20 kHz, ± 0/-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 (+22dBu)


Continuously variable speed fan, rear-to-front air flow

Connectors (each channel)

Input: Active balanced; barrier strip, XLR and 1/4" (6.3 mm).
TRS tip and XLR pin 2 positive
Output: "Touch-proof" binding posts and Neutrik Speakon


Front: AC switch, Ch.1 and Ch.2 gain knobs
Rear: 10-position DIP switch


PWR-ON: Green LED SIGNAL: Yellow LED (1 per channel)
CLIP: Red LED (1 per channel)

Amplifier Protection

Full short circuit, open circuit, thermal, ultrasonic, and RF protection.
Stable into reactive or mismatched loads.

Load Protection

Turn-on/off muting, AC coupling (850, 1450), triac crowbar
(2450, on each channel)


19" (48.3cm) 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

Helpful Info about the Manufacturer
Phone:  800-772-2834 Warranty:  3 Years; 1 Year on TouchMix; B-Stock is 1 (one) Year only!
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