QSC RMX 2450 Series Amplifier



Back to Hire Price List



QSC Audio Products - Hear the Power of TechnologyQSC Audio Home Page


RMX Series


2RU models: RMX 850  |  RMX 1450  |  RMX 1850HD  |  RMX 2450
3RU models: RMX 4050HD  |  RMX 5050

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 breakthrough price. And with QSC's free 6 year warranty, the RMX is an even better value. *


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) and 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 and less than 16" deep. And unlike other designs, RMX output devices are direct-mounted to the heat sink for optimum thermal coupling and cooling.

Comprehensive Features

The RMX Series is packed full of professional features that increase performance and flexibility:

  • The RMX 1850HD provides improved thermal performance that gives you higher continuous power in 2 ohms stereo or 4 ohms bridged applications (a RMX 1850HD exclusive!)

  • Independent defeatable clip limiters reduce distortion without sacrificing peak performance.

  • Selectable low-frequency filters boost system response, protect speakers and ensure low-end tightness by more precisely matching the amplifier's range to the loudspeakers.

  • Barrier strip, XLR and 1/4" balanced inputs plus Speakon and binding post outputs provide easy connections.

  • Low-noise variable speed fans with rear-to-front air flow keep amplifiers and racks cool.

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.


  • Compact size - up to 2400 watts in 2 rack spaces

  • Professional quality performance - incorporates road-proven QSC designs

  • 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" (6.3mm) 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 on each channel automatically protects amplifier and speakers




RMX 850

RMX 1450

RMX 1850HD

RMX 2450


STEREO MODE (Both Channels Driven)

8 ohms
  FTC 20 Hz - 20 kHz, 0.1% THD
  EIA 1 kHz, 0.1% THD

185 W
200 W

260 W
280 W

350 W
360 W

450 W
500 W

4 ohms
  FTC 20 Hz - 20 kHz, 0.1% THD
  EIA 1 kHz, 0.1% THD

280 W
300 W

400 W
450 W

550 W
600 W

650 W
750 W

2 ohms
   EIA 1 kHz, 1% THD

430 W

700 W

900 W

1200 W



8 ohms
  FTC 20 Hz - 20 kHz, 0.1% THD
  EIA 1 kHz, 0.1% THD

530 W
600 W

800 W
900 W

1100 W
1200 W

1300 W
1500 W

4 ohms
   EIA 1 kHz, 1% THD

830 W

1400 W

1800 W

2400 W

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 *







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

10k ohms unbalanced, 20k ohms balanced

Input Clipping

10 Vrms (+22 dB)


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®


Front: AC switch, Ch. 1 and Ch. 2 gain knobs
Rear: 10-position DIP switch


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)

Power Requirements

100, 120, 230 VAC, 50-60 Hz


19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 RU),
15.9" (40 cm) deep (rack mounting to rear support ears)


35 lbs (15.9 kg) net

40 lbs (18.2 kg) net

44.5 lbs (20.2 kg) net

44.5 lbs (20.2 kg) net

* @ 120VAC, both channels driven; multiply current by 0.5 for 230V units

All Specification Subject to Change Without Notice.

Speakon is a trademark of Neutrik

Back to Hire Price List