• 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 amplifier and speakers
  • 3-year warranty plus optional 3-year extended service contract

Please see manufacturer’s product page for more information HERE.

Power per Channel, Stereo Mode (both channels driven)
8Ω, FTC 20 Hz–20 kHz, 0.1% THD800 (650**) W
8Ω, EIA 1 kHz, 0.1% THD850 W
4Ω, FTC 20 Hz–20 kHz, 0.1% THD1300 W
4Ω, EIA 1 kHz, 0.1% THD1400 W
2Ω, FTC 20 Hz–20 kHz, 1% THD1600 W
2Ω, EIA 1 kHz, 1% THD2000 W
Power, Bridge-Mono Mode
8Ω, FTC 20 Hz–20 kHz, 0.1% THD2600 W
8Ω, EIA 1 kHz, 0.1% THD2800 W
4Ω, EIA 1 kHz, 1% THD4000 W
100 V Direct Drive, EIA 1 kHz, 1% THD
Signal to Noise (20 Hz–20 kHz)-100 dB
Distortion (SMPTE-IM)< 0.02%
Input Sensitivity at 8Ω1.42V (+5.3 dBu)
Voltage Gain64x (36 dB)
Output Circuitry3-tier Class H
Current Draw (120 V AC)
Typical, 1/8 power pink noise at 4Ω*
Severe, 1/3 power pink noise at 4Ω*
10.0 A
20.1 A
AC Mains Plug
NEMA 5-15
Distortion (typical)
20 Hz–20 kHz, 10 dB below rated power
1 kHz and below, full rated power
< 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 bybassed, 8Ω)
Damping Factor (1 kHz and below)> 250 at 8Ω
Input Impedance10 kΩ unbalanced; 20 kΩ balanced
Input Stage Clipping6.4 V rms (+18 dBu)
CoolingContinuously 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®
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, tdermal, 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)132 (3 RU) × 482 × 404 mm
5.25 (3 RU) × 19 × 15.9 in
Net Weight30.8 kg / 68 lb
Power Requirements100, 120, 230 V AC (factory configured), 50–60 Hz