QSC RMX 850a
The QSC RMX 850a amplifier 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 breakthrough price.
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.
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) and 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 and less than 16" deep. And unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling and cooling.
Stereo (Watts Per Channel)
- 185 watts @ 8 Ohm
- 300 watts @ 4 Ohm
- 430 watts @ 2 Ohm
Bridge Mono Mode
- 600 watts @ 8 Ohm
- 830 watts @ 4 Ohm
QSC RMX850a Features
- Compact size - 830 watts in two rack spaces
- High-current toroidal transformers, for greater 2-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” (6.3 mm) TRS, XLR, and barrier strip inputs
- Touch-proof binding post and Neutrik Speakon® outputs
- Front mounted gain controls for easy access
- Signal and clip LED indicators for monitoring 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
Specifications
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Power per Channel, Stereo Mode (both channels driven)
- 8Ω, FTC 20 Hz–20 kHz, 0.1% THD: 185 W
- 8Ω, EIA 1 kHz, 0.1% THD: 200 W
- 4Ω, FTC 20 Hz–20 kHz, 0.1% THD: 280 W
- 4Ω, EIA 1 kHz, 0.1% THD: 300 W
- 2Ω, EIA 1 kHz, 1% THD: 430 W
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Power, Bridge-Mono Mode
- 8Ω, FTC 20 Hz–20 kHz, 0.1% THD: 530 W
- 8Ω, EIA 1 kHz, 0.1% THD: 600 W
- 4Ω, EIA 1 kHz, 1% THD: 830 W
- Signal to Noise (20 Hz–20 kHz): -100 dB
- Distortion (SMPTE-IM): < 0.01%
- Input Sensitivity at 8Ω: 1.15V (+3.4 dBu)
- Voltage Gain: 31.6x (30 dB)
- Output Circuitry: Class AB
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Current Draw (120 V AC):
- Typical, 1/8 power pink noise at 4Ω*: 4.5 A
- Severe, 1/3 power pink noise at 4Ω*: 6.6 A
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Weight:
- Net: 35 lb (15.9 kg)
- Shipping: 41 lb (18.6 kg)
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Distortion (typical):
- 20 Hz–20 kHz, 10 dB below rated power: < 0.03% THD, 4Ω and 8Ω
- 1 kHz and below, full rated power: < 0.03% THD, 4Ω and 8Ω
- Frequency Response: 20 Hz–20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed, 8Ω)
- Damping Factor (1 kHz and below): > 300 at 8Ω
- Input Impedance: 10 kΩ unbalanced; 20 kΩ balanced
- Input Stage Clipping: 10 V rms (+22 dBu)
- Cooling: Continuously variable speed fan, back-to-front air flow
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Connectors (each channel):
- Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
- Output: Touch-proof binding posts; Neutrik Speakon®
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Controls:
- Front: AC switch; Channel 1 & 2 gain knobs
- Rear: 10-position DIP switch
- LED Indicators: Power on: Green; Signal: Yellow (1 per channel); Clip/Protect: Red (1 per channel)
- Amplifier Protection: Full short circuit, open circuit, thermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
- Load Protection: Turn-on/off muting; AC coupling (850, 1450); Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
- Dimensions: 3.5” (8.9 cm) tall; 2 rack spaces
- Power Requirements: 100, 120, 230 V AC (factory configured), 50–60 Hz