QSC RMX 4050a Power Amp - 2 x 1400W @ 4 ohms

QSC RMX 4050a Power Amp - 2 x 1400W @ 4 ohms

The QSC RMX 4050a power amplifier is perfectly suited for a wide range of sound reinforcement applications including professional touring, performing musicians, and mobile DJs. The RMX4050a is optimized to deliver high levels of sustained power, extraordinary audio performance, and road-proven reliability.

Like its smaller sibling (the RMX 1850a), the RMX 4050a is one of two RMX "Heavy Duty" models designed to work as hard into 2 ohm loads as most competing amplifiers will at 4 ohms. With a three-tier, Class H design, the RMX 4050a is extremely efficient at real world power levels. Less AC current is wasted and more goes into producing useful audio power. The 120 volt versions of the RMX 4050a accomplish all this with a standard 15 amp plug.

Like all RMX amps, the RMX 4050a features balanced 1/4" TRS, XLR and barrier strip inputs, binding posts and Neutrik Speakon outputs, front-mounted gain controls, plus signal and clip LED indicators to monitor performance.

Stereo (Watts Per Channel)

• 850 watts @ 8 Ohm
• 1400 watts @ 4 Ohm
• 2000 watts @ 2 Ohm

Bridge Mono Mode

• 4000 watts @ 4 Ohm

QSC RMX 4050a Features

• Compact size - 4000 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) 
• Feature a dual mono, high-current power supply for increased reliability and performance
• 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

• Power per Channel, Stereo Mode (both channels driven)
  
  • 8Ω, FTC 20 Hz–20 kHz, 0.1% THD: 800 (650**) W
  • 8Ω, EIA 1 kHz, 0.1% THD: 850 W
  • 4Ω, FTC 20 Hz–20 kHz, 0.1% THD: 1300 W
  • 4Ω, EIA 1 kHz, 0.1% THD: 1400 W
  • 2Ω, FTC 20 Hz–20 kHz, 1% THD: 1600 W
  • 2Ω, EIA 1 kHz, 1% THD: 2000 W
• Power, Bridge-Mono Mode
  
  • 8Ω, FTC 20 Hz–20 kHz, 0.1% THD: 2600 W
  • 8Ω, EIA 1 kHz, 0.1% THD: 2800 W
  • 4Ω, EIA 1 kHz, 1% THD: 4000 W
• Signal to Noise (20 Hz–20 kHz): -100 dB
• Distortion (SMPTE-IM): < 0.02%
• Input Sensitivity at 8Ω: 1.42V (+5.3 dBu)
• Voltage Gain: 64x (36 dB)
• Output Circuitry: 3-tier Class H
• Current Draw (120 V AC):
  
  • Typical, 1/8 power pink noise at 4Ω*: 10.0 A
  • Severe, 1/3 power pink noise at 4Ω*: 20.1 A 
• Weight:
  
  • Net: 68 lb (30.8 kg)
  • Shipping: 77 lb (34.9 kg) 
• Distortion (typical):
  
  • 20 Hz–20 kHz, 10 dB below rated power: < 0.02% THD, 4Ω and 8Ω
  • 1 kHz and below, full rated power: < 0.02% THD, 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): > 250 at 8Ω
• Input Impedance: 10 kΩ unbalanced; 20 kΩ balanced
• Input Stage Clipping: 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, 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: 5.25” (13.3 cm) tall; 3 rack spaces
• Power Requirements: 100, 120, 230 V AC (factory configured), 50–60 Hz