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QSC RMX850a 2X300w Power Amplifier (2U)

The RMX Series deliver unmatched performance at a breakthrough price

Key Features:

  • Compact size — up to 2500 watts in two rack spaces, or 5000 watts in three 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
  • continuous power in 2-ohm stereo or 4-ohm bridged applications.
  • Balanced 1/4” (6.3 mm) TRS, XLR, and barrier strip inputs
  • 3 + 3 year warranty

6 year warranty

    view all QSC products

    Product Code: 400022200

    Pre-Order from our next delivery

    £378.00

    The QSC RMX 850a gives 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 QSC RMX 850a 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 850a
    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, FTC 20 Hz–20 kHz, 1% THD
    2Ω, EIA 1 kHz, 1% THD 430 W
    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 (+3.4dBu)
    Voltage Gain 31.6x (30 dB)
    Output Circuitry Class AB
    Current Draw (120 V AC)
    Typical, 1/8 power pink noise at 4Ω*
    Severe, 1/3 power pink noise at 4Ω*

    4.5 A
    6.6 A
    AC Mains Plug
     100/120V
     230V

    NEMA 5-15
    CEE7/7
    Weight
     Net
     Shipping 

    35 lb (15.9 kg)
    41 lb (18.6 kg) 
    Distortion (typical)
     20 Hz–20 kHz, 10 dB below rated power
     1 kHz and below, full rated power

    < 0.03% THD, 4Ω and 8Ω
    < 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
    Connectors (each channel) Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
    Output: Touch-proof binding posts; Neutrik Speakon® 
    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
    • Compact size — up to 2500 watts in two rack spaces, or 5000 watts in three 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
    • The 4000-watt RMX4050a operates on a standard 15 amp plug (120V) 
    • Both the RMX4050a and the RMX5050a feature a dual mono, high-current power supply for increased reliability and performance
    • The RMX4050a's particularly exceptional combination of cooling capacity and electrical efficiency provides robust thermal performance suitable for high continuous power in 2-ohm stereo or 4-ohm bridged applications.
    • 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
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