QSC RMX-850 Power Amplifier
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QSC RMX-850 Power Amplifier

QSC RMX-850 Power Amplifier

Item# RMX-850

Product Description

RMX 850
2 Channels, 200 Watts/Ch at 8 ohm, 300 Watts/Ch at 4 ohm, 430 Watts/Ch at 2 ohm

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.

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.

  • Professional quality performance
  • High-current toroidal transformers for greater two-ohm power and low noise
  • Independent user-defeatable clip limiters reduce distortion
  • Selectable low-frequency filters (30Hz or 50 Hz) (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
  • 3-year warranty plus optional 3-year extended service contract

    RMX 850
    RMX 1450
    RMX 1850HD
    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
    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
    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
    Class H
    Class H
    Power Requirements
    1/8 power pink noise at 4 ohms *

    5 A

    6 A

    6 A

    7 A
    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
    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

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