QSC RMX1450a Specifications

RMXa Series

RMX 850a | RMX 1450a |
RMX 2450a | RMX 4050a |
RMX 5050a

Professional Power Amplifiers

RMX 850a | RMX 1450a | RMX 2450a |

RMX 4050a | RMX 5050a

Features

• Professional quality performance—
incorporates road-proven QSC designs

• The 4000 watt RMX 4050a operates on a
standard 15 amp plug (120V)

• Both the RMX 4050a and RMX 5050a
feature a dual mono, high-current power
supply for increased reliability and
performance

• The RMX 4050a provides improved thermal
performance yielding higher continuous
power in 2 ohm stereo or 4 ohm bridged
applications.

• Compact size — up to 2500 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

The RMXa Series amplifiers from QSC offer
true professional-quality performance at an
affordable price. Three 2-rackspace models
range in power from 430 to 1200 watts per
channel at 2 ohms. Two 3-rackspace models
provide 2000 to 2500 watts per channel at
2 ohms. All five models feature 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.

RMX 5050a

QSC’s RMX 5050a power amplifier
represents state-of-the-art in professional
quality performance at an affordable
price. Perfectly suited for a wide range of

RMX Power Amplifiers

Watts per channel

Model 8Ω 4Ω 2Ω* Bridged 4Ω*

RMX 850a 200 300 430 830

RMX 1450a 300 500 700 1400

RMX 2450a 500 800 1200 2400

RMX 4050a 850 1400 2000 4000

RMX 5050a 1100 2000* 2500 5000

8 ohms: 0.1% THD, 4 ohms: 0.5% THD, 2 ohms and 4 ohms bridged: 1 kHz, 1% THD

sound reinforcement applications including
professional touring, performing musicians,
and mobile entertainers, the RMX 5050a is
optimized to deliver high levels of sustained
power, extraordinary audio performance and
road-proven reliability.

RMX 4050a

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.

Both the RMX 5050a and RMX 4050a feature
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.

• 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

RMXa Details

RMX 850a RMX 1450a RMX 2450a RMX 4050a RMX 5050a

Stereo Mode (both channels driven)
8Ω / FTC 20 Hz – 20 kHz / 0.1% THD
8Ω / EIA 1 kHz / 0.1% THD
4Ω / FTC 20 Hz – 20 kHz / 0.1% THD
4Ω / EIA 1 kHz / 0.1% THD
2Ω / FTC 20 Hz – 20 kHz / 1% THD
2Ω / EIA 1 kHz / 1% THD

Bridge-Mono Mode
8Ω / FTC 20 Hz – 20 kHz / 0.1% THD
8Ω / EIA 1 kHz / 0.1% THD
4Ω / EIA 1 kHz / 1% THD

Signal to Noise (20 Hz – 20 kHz) 8Ω > -100 dB > -100 dB > -100 dB > -100 dB > -100 dB

Distortion (SMPTE-IM) < 0.01% < 0.01% < 0.02% < 0.02% < 0.02%

Input Sensitivity at 8Ω 1.15V (+3.4 dBu) 1.15V (+3.4 dBu) 1.23V (+4.0 dBu) 1.42V (+5.3 dBu) 1.42V (+5.3 dBu)

Voltage Gain 31.6x (30 dB) 40x (32 dB) 50x (34 dB) 64x (36 dB) 64x (36 dB)

Output Circuitry Class AB Class AB 2-tier Class H 3-tier Class H 3-tier Class H

Power Requirements
Typical, 1/8 power pink noise at 4Ω*
Severe, 1/3 power pink noise at 4Ω*

Supplied Plug Type, 100/120V NEMA 5-15 NEMA 5-15 NEMA 5-15 NEMA 5-15 NEMA 5-20

Supplied Plug Type, 230V CEE7/7 CEE7/7 CEE7/7 CEE7/7 CEE7/7

Weight
Net
Shipping

Distortion (typical)
20 Hz – 20 kHz: 10 dB below rated power

1.0 kHz and below: full rated power

Frequency Response 20 Hz – 20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed / 8Ω)

Damping Factor (1 kHz and below) > 300 at 8Ω > 250 at 8Ω

Input Impedance 10k ohms unbalanced / 20k ohms balanced

Input Clipping 10 Vrms (+22 dBu) 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

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 3.5” (8.9 cm) tall / 2 rack spaces 5.25” (13.3 cm) tall / 3 rack spaces

Power Requirements 100, 120, 230 VAC, 50 – 60 Hz (factory configured)

1

1.0 kHz sine wave, 1% THD, 1 channel driven

185 W
200 W
280 W
300 W
–
430 W

530 W
600 W
830 W

4.5 A

6.6 A

35 lb (15.9 kg)
41 lb (18.6 kg)

260 W
300 W
400 W
500 W (0.5% THD)
–
700 W

800 W
900
1400 W

6.0 A

9.6 A

40 lb (18.2 kg)
46 lb (20.9 kg)

< 0.03% THD / 4Ω and 8Ω
< 0.03% THD / 4Ω and 8Ω

Output: Touch-proof binding posts / Neutrik Speakon®

Rear: 10-position DIP switch

450 W
500 W
650 W
750 W
–
1200 W

1300 W
1500 W
2400 W

6.3 A

15.6 A

44.5 lb (20.2 kg)

50.5 lb (23 kg)

800 (650**) W
850 W
1300 W
1400 W
1600 W
2000 W

2600 W
2800 W
4000 W

10.0 A

20.1 A

68 lb (30.8 kg)
77 lb (34.9 kg)

< 0.02% THD / 4Ω and 8Ω
< 0.02% THD / 4Ω and 8Ω

1050 W
1100 W
1600 W
1800 W
2000 W
2500 W

3200 W
3600 W
5000 W

13.9 A

26.9 A

75 lb (33.1 kg)
87 lb (37.2 kg)

Specifications subject to change without notice.

1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: [phone]

© 2013 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark

office and other countries. Speakon is a trademark of Neutrik. All other trademarks are the property of their respective owners. Patents may apply or be pending.

please recycle

RMXa Spec Sheet 08/09/2013