QSC RMX 5050a Power Amplifier

SKU: RMX 5050a

2 channels, 1100 watts/ch at 8Ω, 1800 watts/ch at 4Ω, 2500 watts/ch at 2Ω, 5000 watts/ch at 4Ω (bridged)


About this item



QSC RMX 5050a Power Amplifier

QSC RMX 5050a Power Amplifier; Professional quality performance, incorporating road-proven QSC designs


  • 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-inch (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 the amplifier and speakers
  • 3-year warranty plus optional 3-year extended service contract
 ModelRMX 850aRMX 1450aRMX 2450aRMX 4050aRMX 5050a
Power per Channel, Stereo Mode (both channels driven)
8Ω, FTC 20 Hz–20 kHz, 0.1% tdD185 W260 W450 W800 (650**) W1050 W
8Ω, EIA 1 kHz, 0.1% tdD200 W300 W500 W850 W1100 W
4Ω, FTC 20 Hz–20 kHz, 0.1% tdD280 W400 W650 W1300 W1600 W
4Ω, EIA 1 kHz, 0.1% tdD300 W500 W (0.5% tdD)800 W1400 W1800 W
2Ω, FTC 20 Hz–20 kHz, 1% tdD1600 W2000 W
2Ω, EIA 1 kHz, 1% tdD430 W700 W1200 W2000 W2500 W
Power, Bridge-Mono Mode
8Ω, FTC 20 Hz–20 kHz, 0.1% tdD530 W800 W1300 W2600 W3200 W
8Ω, EIA 1 kHz, 0.1% tdD600 W900 W1500 W2800 W3600 W
4Ω, EIA 1 kHz, 1% tdD830 W1400 W2400 W4000 W5000 W
Signal to Noise (20 Hz–20 kHz)-100 dB
Distortion (SMPTE-IM)< 0.01%< 0.02%
Input Sensitivity at 8Ω1.15V (+3.4dBu)1.23V
(+4.0 dBu)
1.42V (+5.3 dBu)
Voltage Gain31.6x (30 dB)40x (32 dB)50x (34 dB)64x (36 dB)
Output CircuitryClass AB2-tier Class H3-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
NEMA 5-15
NEMA 5-20
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 Response20 Hz–20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bypassed, 8Ω)
Damping Factor (1 kHz and below)> 300 at 8Ω> 250 at 8Ω
Input Impedance10 kΩ unbalanced; 20 kΩ balanced
Input Stage Clipping10 V rms (+22 dBu)6.4 V rms (+18 dBu)
CoolingContinuously variable speed fan, back-to-front airflow
Connectors (each channel)Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
Output: Touch-proof binding posts; Neutrik Speakon®
ControlsFront: AC switch; Channel 1 & 2 gain knobs
Rear: 10-position DIP switch
LED IndicatorsPower on: Green; Signal: Yellow (1 per channel); Clip/Protect: Red (1 per channel)
Amplifier ProtectionFull short circuit, open circuit, thermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
Load ProtectionTurn-on/off muting; AC coupling (850, 1450); Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
Product Dimensions (H×W×D)89 (2 RU) × 482 × 404 mm
3.5 (2 RU) × 19 × 15.9 in
132 (3 RU) × 482 × 404 mm
5.25 (3 RU) × 19 × 15.9 in
Carton Dimensions (H×W×D)610 × 560 × 153 mm
24 × 22 × 6 in
610 × 560 × 229 mm
24 × 22 × 9 in
Net Weight15.9 kg / 35 lb18.2 kg / 40 lb20.2 kg / 44.5 lb30.8 kg / 68 lb33.1 kg / 75 lb
Shipping Weight18.6 kg / 41 lb20.9 kg / 46 lb23 kg / 50.5 lb34.9 kg / 77 lb37.6 kg / 87 lb
Power Requirements100, 120, 230 V AC (factory configured), 50–60 Hz


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