QSC's RMX 4050HD power amplifier represents the state-of-the-art in professional quality performance at an affordable price. Perfectly suited for a wide range of sound reinforcement applications including professional touring, performing musicians, and mobile DJs, the RMX 4050HD is optimized to deliver high levels of sustained power, extraordinary audio performance, and road-proven reliability.

Like its smaller sibling (the RMX 1850HD), the RMX 4050HD 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 4050HD is extremely efficient at real world power levels. Less AC current is wasted and more goes into producing useful audio power. The RMX 4050HD accomplishes all this with a standard 15 amp plug.

Like all RMX amps, the RMX 4050HD 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.

• The RMX 4050HD provides improved thermal performance that gives you higher continuous power in 2 ohms stereo or 4 ohms bridged applications
• Dual mono, high current power supply for increased reliability and performance
• 3RU chassis only 16" deep
• Professional quality performance - incorporates road-proven QSC designs
• 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
• Binding post and Neutrik Speakon™ outputs
• Front mounted gain controls for easy access
• Signal and Clip LED indicators to monitor performance
  
  STEREO MODE, Both Channels Driven
• 8 ohms FTC 20 Hz-20 kHz 0.1% THD 800 Watts
• 4 ohms FTC 20 Hz-20 kHz 0.1% THD 1300 Watts
• 2 ohms FTC 20 Hz-20 kHz 0.1% THD 1600 Watts
• 8 ohms EIA 1 kHz 0.1% THD 850 Watts
• 4 ohms EIA 1 kHz 0.1% THD 1400 Watts
• 2 ohms EIA 1 kHz 1% THD 2000 Watts
  
  BRIDGE-MONO MODE
• 8 ohms FTC 20 Hz-20 kHz 0.1% THD 2600 Watts
• 8 ohms EIA 1 kHz 0.1% THD 2800 Watts
• 4 ohms EIA 1 kHz 1% THD 4000 Watts
  
  Distortion (SMPTE-IM)
• Less than 0.02%
  
  Distortion (Typical)
• 20 Hz-20 kHz: 10 dB below rated power
• 1 kHz and below: full rated power
  
• Less than 0.02% 4 ohm, less than 0.01% 8 ohms
• Less than 0.02% 4 ohm, less than 0.01% 8 ohms
  
  Frequency Response
• 20 Hz to 20 kHz, 8 ohms, LF filter bypassed, +0/-1 dB
• 5 Hz to 50 kHz, 8 ohms, LF filter bypassed, +0/-3 dB
  
  Damping Factor
• Greater than 250 @ 8 ohm
  
  Noise (unweighted)
• 100 dB below rated output (20 Hz to 20 kHz, 8 ohm load)
  
  Input Sensitivity
• 1.25 Vrms for 800 watts into 8 ohms
  
  Controls Rear:
  
• AC power switch, Ch. 1 and Ch. 2 gain control
• 10-pole DIP switch featuring LF filter on/off, LF filter 30/50 Hz, Clip Limiter on/off controls for each channel and switches for selecting Stereo, Parallel, or Bridge mode. Push-button circuit breaker for each channel.
  
  Voltage Gain
• 64x (36 dB) for 8 ohm load
  
  Input Impedance
• 20 k ohm balanced, 10 k ohm unbalanced
  
  Indicators
• Power-On: Green LED, Protect: Red LED
• Signal -30dB: Yellow LED, Clip: Red LED
  
  Connectors Output:
• XLR female, TRS (1/4-inch), and barrier-strip screw terminals, each channel
• Binding posts and Speakon outputs (Ch. 1 Speakon wired for biamp)
  
  Cooling
• Continuously variable-speed fan, rear-to-front air flow
  
  Amplifier Protection
• Short circuit, open circuit, thermal, ultrasonic, and RF protection. Stable into reactive or mismatched loads
  
  Load Protection
• On/off muting, DC fault output crowbar
  
  Power Requirements
• 100, 120 or 240 Volts AC (+/-10%) 50-60 Hz (factory configured)
  
  Dimensions
• 19" 19.0" (48.3 cm) wide, 5.25" (13.3 cm) tall, 15.9" (40.39 cm) overall depth
  
  Weight
• 68 lb (30.84 kg) net, 77 lb (34.43 kg) shipping