QSC Audio RMX 850 Professional Power Amplifier

The RMX Series amplifiers give you clean, dynamic power with the legendary QSC sound quality and reliability that pros depend on. The RMX Series deliver unmatched performance at a new breakthrough price.

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 us to pack up to 2400 watts of power in a chassis only 2 rack spaces & less than 16" deep. 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:

• The RMX 1850HD provides improved thermal performance that gives you higher continuous power in 2-ohms stereo or 4-ohms bridged applications (a RMX 1850HD exclusive!)
• 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" 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.

Proven Reliability

With over 30 years of building amplifiers for the largest touring companies and venues around the world, you can count on QSC's reputation for designing the most reliable amps available.

Features:

• Compact size--up to 2400 watts in 2 rack spaces
• Professional quality performance--incorporates road-proven QSC designs
• High-current toroidal transformers for greater two-ohm power and low noise
• Independent user-defeatable clip limiters reduce distortion
• Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
• Balanced 1/4" (6.3mm) TRS, XLR and barrier strip inputs
• Binding post and Neutrik Speakon outputs
• Front mounted gain controls for easy access
• Signal and Clip LED indicators to monitor performance
• Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
• 3-year warranty plus optional 3-year extended service contract

RMX SPECIFICATIONS	RMX 850	RMX 1450	RMX 1850HD	RMX 2450
STEREO MODE, EIA: Both Channels Driven
8 ohms EIA 1 kHz, 0.1% THD	200W	280W	360W	500W
4 ohms EIA 1 kHz, 0.1% THD	300W	450W	600W	750W
2 ohms EIA 1 kHz, 1% THD	430W	700W	900W	1200W
BRIDGE MONO MODE
8 ohms EIA 1 kHz, 0.1% THD	600W	900W	1200W	1500W
4 ohms EIA 1 kHz, 1% THD	830W	1400W	1800W	2400W
Signal to Noise, 20 Hz-20 kHz	100 dB	100 dB	100 dB	100 dB
Distortion (SMPTE-IM)	Less than 0.01%	Less than 0.01%	Less than 0.02%	Less than 0.02%
Input Sensitivity @ 8 ohms	1.15v (+3.4 dBu)	1.15v (+3.4 dBu)	1.16v (+3.5 dBu)	1.23v (+4.0 dBu)
Voltage Gain	31.6x (30 dB)	40x (32 dB)	46x (33 dB)	50x (34 dB)
Output Circuitry	AB	AB	Class H	Class H
Power Requirements 1/8 power pink noise at 4 ohms *	5 A	6 A	6 A	7 A
Weight	35 lb (15.9 kg) net	40 lb (18.2 kg) net	44.5 lb (20.2 kg) net	44.5 lb (20.2 kg) net
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, +/- 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 (850, 1450), triac crowbar (1850HD, 2450, on each channel)
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
All Specification Subject to Change Without Notice.

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