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QSC RMX Series Amplifers

The RMX Series amplifiers from QSC deliver true professional-quality performance at an affordable price. There are four 2-rackspace models ranging in power from 430 to 1200 watts per channel at 2 ohms and two 3-rackspace models that provide 2000 to 2500 watts per channel at 2 ohms. All models feature a comprehensive feature set built on a compact chassis that's only 400mm deep. User-defeatable clip limiters and selectable low frequency filters are included to enable users to optimize sonic performance.

The QSC RMX Series amplifiers give you clean, dynamic power with the legendary QSC sound quality and reliability that professional sound engineers depend on. 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 amplifiers available.

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.

Extensive use of surface mount technology (SMT) triples the small-signal component density, enabling QSC to pack up to 2400 watts of power into the compact chassis. Unlike many other designs, the output devices in RMX Series amplifiers are direct mounted onto the heat sink for optimum thermal coupling and cooling.


  • Professional quality performance utilising road-proven QSC designs.
  • The RMX4050HD and RMX5050 feature a dual mono, high current power supply for increased reliability and performance.
  • Compact size, up to 2400 watts in 2 rack spaces or 5000 watts in 3 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.
  • LED indicator for power on.
  • LED indicator for signal presence for each channel
  • LED indicators for clipping for each channel.
  • Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers.
  • Rugged all-steel 2U or 3U chassis construction.

Panel Layouts

QSC RMX Series Amplifiers Front Panel
QSC RMX Series Amplifiers Rear Panel

Output Power Rating

  8-Ohm Stereo 4-Ohm Stereo 2-Ohm Stereo 4-Ohm Mono
(Per Channel) (Per Channel) (Per Channel) (Bridge Mode)
RMX850 200W 300W 430W 830W
RMX1450 280W 450W 700W 1,400W
RMX1850HD 360W 600W 900W 1,800W
RMX2450 500W 750W 1,200W 2,400W
RMX4050HD 850W 1,400W 2,000W 4,000W
RMX5050 1,100W 1,800W 2,500W 5,000W
  Power in Watts at 1 kHz, 0.1% THD Power in Watts at 1 kHz, 1% THD

Technical Specifications

Frequency Response 20 Hz to 20 kHz +0/-1 dB
T.H.D. < 0.03%, 1kHz and below at full rated power, 4 & 8 Ohms
Signal to Noise Ratio > 100 dB (unweighted 20 Hz to 20 kHz, below rated output)
Input Sensitivity 1.15 Vrms to 1.42Vrms depending on model
Input Impedance 20 k ohms balanced or 10k Ohms unbalanced
Input Connectors 3-Pin XLR and 6.3 mm TRS, tip and pin 2 positive, and barrier strip
Output Power See power chart above
Load Impedance 2 to 8 ohms per channel
Damping Factor > 300 at 8 Ohms
Speaker Connectors Touch-Proof” binding posts and Neutrik Speakon™
Power Supply Required AC input 230 VAC 50 Hz
Ventilation Continuously variable speed fan, back-to-front air flow
Construction Steel panels with black finish


Model ..... RMX850 ... RMX1450 ... RMX1850HD
Width ..... 483 mm ........ 483 mm ........ 483 mm
Depth ..... 400 mm ........ 400 mm ........ 400 mm
Height ..... 89 mm .......... 89 mm .......... 89 mm
Weight .... 15.9 Kg ........ 18.2 Kg ........ 20.2 Kg
Model ..... RMX2450 ... RMX4055HD .. RMX5050
Width ..... 483 mm ........ 483 mm ........ 483 mm
Depth ..... 400 mm ........ 400 mm ........ 400 mm
Height ..... 89 mm .......... 135 mm ........ 135 mm
Weight .... 20.2 Kg ........ 30.8 Kg ........ 33.1 Kg
QSC RMX Series Amplifier Dimensions

Ordering Information

Description Order Code
QSC RMX850 2-Channel Power Amplifier QSC-RMX850
QSC RMX1450 2-Channel Power Amplifier QSC-RMX1450
QSC RMX1850HD 2-Channel Power Amplifier QSC-RMX1850HD
QSC RMX2450 2-Channel Power Amplifier QSC-RMX2450
QSC RMX4050HD 2-Channel Power Amplifier QSC-RMX4050HD
QSC RMX5050 2-Channel Power Amplifier QSC-RMX5050
The information presented on this page is provided by courtesy of QSC Audio Products Inc.
Revised: 16-May-2011 Copyright (C) 2011 Adena Limited