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QSC RMX 1450 Power Amp

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Quick Overview

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 new breakthr...
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 new breakthrough price.

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

  • 3-year warranty plus optional 3-year extended service contract


RMX 850

RMX 1450

RMX 1850HD

RMX 2450

STEREO MODE, EIA: Both Channels Driven

8 ohms EIA 1 kHz, 0.1% THD





4 ohms EIA 1 kHz, 0.1% THD





2 ohms EIA 1 kHz, 1% THD






8 ohms EIA 1 kHz, 0.1% THD





4 ohms EIA 1 kHz, 1% THD





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 *

5 A

6 A

6 A

7 A


35 lb (15.9 kg) net

40 lb (18.2 kg) net

44.5 lb (20.2 kg) net

44.5 lb (20.2 kg) net


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 Response20 Hz-20 kHz, +/- 1 dB, -3 dB points: 5 Hz-50 kHz
Damping Factor, 1 kHz and belowGreater than 300 at 8 ohms
Input Impedance10 k ohms unbalanced, 20 k ohms balanced
Input Clipping10 Vrms (+22 dB)
CoolingContinuously variable-speed fan, rear-to-front air flow
Connectors, each channelInput: 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
ControlsFront: AC switch, Ch. 1 and Ch. 2 gain knobs

Rear: 10-position DIP switch
IndicatorsPower-On: Green LEDSignal: Yellow LED (1 per channel)

Clip: Red LED (1 per channel)
Amplifier ProtectionStable into reactive or mismatched loads
Load ProtectionOn/off muting, AC coupling (850, 1450), triac crowbar

(1850HD, 2450, on each channel)
Dimensions19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 rack spaces),

15.9" (40 cm) deep (rack mounting to rear support ears)
Power Requirements100, 120, 230 VAC, 50-60 Hz
* @ 120VAC, both channels driven; multiply current by .5 for 230V units

All Specification Subject to Change Without Notice.