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QSC RMX-4050 Professional Power Amplifier - click to enlarge

QSC RMX-4050 Professional Power Amplifier

QSC’s RMX 4050HD power amplifier represents the state-of-the-art in professional quality performance at an affordable price. Perfectly suited for a wide range of sound reinforcement applications including professional touring, performing musicians, and mobile DJs, the RMX 4050HD is optimized to deliver high levels of sustained power, extraordinary audio performance, and road-proven reliability.

Like its smaller sibling (the RMX 1850HD), the RMX 4050HD is one of two RMX “Heavy Duty” models designed to work as hard into 2-ohm loads as most competing amplifiers will at 4-ohms. With a three-tier, Class H design, the RMX 4050HD is extremely efficient at real world power levels. Less AC current is wasted and more goes into producing useful audio power. The RMX 4050HD accomplishes all this with a standard 15-Amp plug.

Like all RMX amps, the RMX 4050HD features balanced 1/4" TRS, XLR and barrier strip inputs, binding posts and Neutrik Speakon™ outputs, front-mounted gain controls, plus signal and clip LED indicators to monitor performance.

  • The RMX 4050HD provides improved thermal performance
  • Higher continuous power in 2-ohms stereo or 4-ohms bridged
  • Dual mono, high current power supply
  • 3RU chassis only 16" deep
  • 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 (30 Hz or 50 Hz) protect speakers and increase headroom
  • Balanced 1/4" (6.3 mm) 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
  • 3-year warranty


    STEREO MODE, Both Channels Driven
    8 ohms FTC 20 Hz-20 kHz 0.1% THD
    800 Watts
    4 ohms FTC 20 Hz-20 kHz 0.1% THD
    1300 Watts
    2 ohms FTC 20 Hz-20 kHz 0.1% THD
    1600 Watts
    8 ohms EIA 1 kHz 0.1% THD
    850 Watts
    4 ohms EIA 1 kHz 0.1% THD
    1400 Watts
    2 ohms EIA 1 kHz 1% THD
    2000 Watts

    8 ohms FTC 20 Hz-20 kHz 0.1% THD
    2600 Watts
    8 ohms EIA 1 kHz 0.1% THD
    2800 Watts
    4 ohms EIA 1 kHz 1% THD
    4000 Watts
    Distortion (SMPTE-IM) Less than 0.02%
    Distortion (Typical)
    20 Hz-20 kHz: 10 dB below rated power
    1 kHz and below: full rated power

    Less than 0.02% 4 ohm, less than 0.01% 8 ohms
    Less than 0.02% 4 ohm, less than 0.01% 8 ohms
    Frequency Response

    20 Hz to 20 kHz, 8 ohms, LF filter bypassed, +0/-1 dB
    5 Hz to 50 kHz, 8 ohms, LF filter bypassed, +0/-3 dB
    Damping Factor Greater than 250 @ 8 ohm
    Noise (unweighted) 100 dB below rated output (20 Hz to 20 kHz, 8 ohm load)
    Input Sensitivity 1.25 Vrms for 800 watts into 8 ohms
    Controls Front:
    Controls Rear:

    AC power switch, Ch. 1 and Ch. 2 gain control
    10-pole DIP switch featuring LF filter on/off, LF filter 30/50 Hz, Clip Limiter on/off controls for each channel and switches for selecting Stereo, Parallel, or Bridge mode. Push-button circuit breaker for each channel.
    Voltage Gain 64x (36 dB) for 8 ohm load
    Input Impedance 20 k ohm balanced, 10 k ohm unbalanced

    Power-On: Green LED, Protect: Red LED
    Signal -30dB: Yellow LED, Clip: Red LED
    Connectors Input:
    Connectors Output:
    XLR female, TRS (1/4-inch), and barrier-strip screw terminals, each channel
    Binding posts and Speakon outputs (Ch. 1 Speakon wired for biamp)
    Cooling Continuously variable-speed fan, rear-to-front air flow
    Amplifier Protection

    Short circuit, open circuit, thermal, ultrasonic, and RF protection. Stable into reactive or mismatched loads
    Load Protection On/off muting, DC fault output crowbar
    Power Requirements 100, 120 or 240 Volts AC (+/-10%) 50-60 Hz (factory configured)
    Dimensions 19" 19.0" (48.3 cm) wide, 5.25" (13.3 cm) tall, 15.9" (40.39 cm) overall depth
    Weight 68 lb (30.84 kg) net, 77 lb (34.43 kg) shipping

    Free Shipping

    RMX-4050List price: $1,700.00Your price: $1,399.99



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