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QSC RMX Series Amplifiers
SKU: 76
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Overview

Professional quality performance, incorporating road-proven QSC designs

 

FEATURES: 

  • Compact size — up to 2500 watts in two rack spaces, or 5000 watts in three 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

  • The 4000-watt RMX4050a operates on a standard 15 amp plug (120V)

  • Both the RMX4050a and the RMX5050a feature a dual mono, high-current power supply for increased reliability and performance

  • The RMX4050a's particularly exceptional combination of cooling capacity and electrical efficiency provides robust thermal performance suitable for high continuous power in 2-ohm stereo or 4-ohm bridged applications.

  • 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

  • Signal and clip LED indicators for monitoring 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

 

SPECIFICATIONS:

 

 Model

RMX 850a

RMX 1450a

RMX 2450a

RMX 4050a

RMX 5050a

 

Power per Channel, Stereo Mode (both channels driven)

 

8Ω, FTC 20 Hz–20 kHz, 0.1% tdD

185 W

260 W

450 W

800 (650**) W

1050 W

 

8Ω, EIA 1 kHz, 0.1% tdD

200 W

300 W

500 W

850 W

1100 W

 

4Ω, FTC 20 Hz–20 kHz, 0.1% tdD

280 W

400 W

650 W

1300 W

1600 W

 

4Ω, EIA 1 kHz, 0.1% tdD

300 W

500 W (0.5% tdD)

800 W

1400 W

1800 W

 

2Ω, FTC 20 Hz–20 kHz, 1% tdD

1600 W

2000 W

 

2Ω, EIA 1 kHz, 1% tdD

430 W

700 W

1200 W

2000 W

2500 W

 

Power, Bridge-Mono Mode

 

8Ω, FTC 20 Hz–20 kHz, 0.1% tdD

530 W

800 W

1300 W

2600 W

3200 W

 

8Ω, EIA 1 kHz, 0.1% tdD

600 W

900 W

1500 W

2800 W

3600 W

 

4Ω, EIA 1 kHz, 1% tdD

830 W

1400 W

2400 W

4000 W

5000 W

 

Signal to Noise (20 Hz–20 kHz)

-100 dB

 

Distortion (SMPTE-IM)

< 0.01%

< 0.02%

 

Input Sensitivity at 8Ω

1.15V (+3.4dBu)

1.23V 
(+4.0 dBu)

1.42V (+5.3 dBu)

 

Voltage Gain

31.6x (30 dB)

40x (32 dB)

50x (34 dB)

64x (36 dB)

 

Output Circuitry

Class AB

2-tier Class H

3-tier Class H

 

Current Draw (120 V AC)
Typical, 1/8 power pink noise at 4Ω*
Severe, 1/3 power pink noise at 4Ω*


4.5 A
6.6 A


6.0 A
9.6 A


6.3 A
15.6 A


10.0 A
20.1 A


13.9 A
26.9 A

 

AC Mains Plug
100/120V
230V

NEMA 5-15
CEE7/7


NEMA 5-20
CEE7/7

 

Weight
Net
Shipping


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


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


44.5 lb (20.2 kg)
50.5 lb (23 kg)


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


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

 

Distortion (typical)
20 Hz–20 kHz, 10 dB below rated power
1 kHz and below, full rated power


< 0.03% tdD, 4Ω and 8Ω
< 0.03% tdD, 4Ω and 8Ω


< 0.02% tdD, 4Ω and 8Ω
< 0.02% tdD, 4Ω and 8Ω

 

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

10 kΩ unbalanced; 20 kΩ balanced

 

Input Stage Clipping

10 V rms (+22 dBu)

6.4 V rms (+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+)
Output: Touch-proof binding posts; Neutrik Speakon®

 

Controls

Front: AC switch; Channel 1 & 2 gain knobs
Rear: 10-position DIP switch

 

LED Indicators

Power on: Green; Signal: Yellow (1 per channel); Clip/Protect: Red (1 per channel)

 

Amplifier Protection

Full short circuit, open circuit, tdermal, 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 Requirement

100, 120, 230 V AC (factory configured), 50–60 Hz

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