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QSC RMX4050a Power Amplifier  

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The RMXa Series amplifiers from QSC offer true professional-quality performance at an affordable price. The 3-rackspace RMX4050a provides 2000 watts per channel at 2 ohms. It features a compact chassi... Read More

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The RMXa Series amplifiers from QSC offer true professional-quality performance at an affordable price. The 3-rackspace RMX4050a provides 2000 watts per channel at 2 ohms. It features a compact chassis less than 16" deep. RMXa amplifiers include a comprehensive set of features including XLR and 1/4" balanced inputs, Speakon and binding post outposts for convenient connectivity. User-defeatable clip limiters and selectable low-frequency filters optimize sonic performance.

The RMX 4050a is a "heavy duty" model designed to work as hard into 2 ohm loads as most competing amplifiers will at 4 ohms. It features a three-tier, Class H design that is extremely efficient at real world power levels. Less AC current is wasted and more available current goes into producing useful audio power. 120 volt versions of the RMX4050a accomplish all this with a standard 15 amp plug.

  • Compact size
  • High-current toroidal transformers
  • Independent user-defeatable clip limiters
  • Selectable low-frequency
  • Balanced 1/4" (6.3 mm) TRS, XLR, and barrier strip inputs
  • Touch-proof binding post and Neutrik Speakon outputs
  • Independent DC and thermal overload protection
  • Stereo Mode (both channels driven):
    8Î/ FTC 20 Hz - 20 kHz / 0.1% THD: 800W
    8Î/ EIA 1 kHz / 0.1% THD: 850W
    4Î/ FTC 20 Hz - 20 kHz / 0.1% THD: 1300W
    4Î/ EIA 1 kHz / 0.1% THD: 1400W
    2Î/ FTC 20 Hz - 20 kHz / 1% THD: 1600W
    2Î/ EIA 1 kHz / 1% THD: 2000W
    Bridge-Mono Mode
    8Î/ FTC 20 Hz - 20 kHz / 0.1% THD: 2600W
    8Î/ EIA 1 kHz / 0.1% THD: 2800W
    4Î/ EIA 1 kHz / 1% THD: 4000W
    Signal to Noise (20 - 20 kHz) 8Î: > -100 dB
    Distortion (SMPTE-IM): <0.02%
    Input Sensitivity at 8Î: 1.42V (+5.3 dBu)
    Voltage Gain: 64X (36dB)
    Output Circuitry: 3-tier Class H
    Power Requirements: 10A
    Typical, 1/8 power pink noise at 4Î*: 20.1A
    Supplied Plug Type, 100/120V: NEMA 5-15
    Supplied Plug Type, 230V: CEE7/7
    Weight: 68lb
    Frequency Response : 20 Hz - 20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bypassed / 8Î)Damping Factor (1 kHz and below)
    Input Impedance: 10K ohms unbalanced, 20K ohms balanced
    Input Clipping: 6.4 Vrms (+18 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+)
    Controls: Front: AC switch / Ch. 1 & 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) | Protect: Red LED
    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: 5.25" tall / 3 rack spaces
    Power Requirements: 100, 120, 230 VAC, 50 - 60 Hz (factory configured)


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  • Repair costs covered for up to three years from date of purchase
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Review Snapshot

by PowerReviews
QSCRMX4050a Power Amplifier

(based on 1 review)

Ratings Distribution

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Reviewed by 1 customer

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Love this product, would also buy his big brother !!

By Razor

from Flint , Michigan

About Me Experienced

Verified Buyer


  • Easy To Use
  • Excellent Sound
  • Good Warmth
  • Powerful


    Best Uses

    • Amateur Recording
    • Events
    • Home Studio
    • Mobile DJ
    • Professional Recording

    Comments about QSC RMX4050a Power Amplifier:

    Use for powering some 1000 watt Cerwin Vegas with both channels driven

    Comment on this reviewHelp Icon

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