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 1 of 2 RMX "Heavy Duty" models designed to work as hard into 2-ohm loads as most competing amplifiers will at 4-ohms. With a 3-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 in. 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

Features
Dual mono, high current power supply for increased reliability and performance

3RU chassis only 16 in. 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 in. (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

3-year warranty

Technical Info

Stereo Mode, Both Channels Driven Continuous: Average Output Power Per Channel 
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 EIC 1 kHz 0.1% THD: 850 Watts 
4 ohms EIC 1 kHz 0.1% THD: 1400 Watts 
2 ohms EIC 1 kHz 1% THD: 2000 Watts 

Bridge-Mono: Mode Bridge-Mono Mode Operation 
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: Less than 0.02% 4 ohm, less than 0.01% 8 ohms
1 kHz and below: full rated power: 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 Front: AC power switch, Ch. 1 and Ch. 2 gain control

Controls Rear: 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 Input: XLR female, TRS (1/4 in.), and barrier-strip screw terminals, each channel

Connectors Output: 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 W x H x D: 19 x 5.25 x 15.9 in. (48.3 x 13.3 x 40.39 cm)

Weight: 68 lbs. (30.84 kg) net, 77 lbs. (34.43 kg) shipping