QSC RMX4050HD Power Amplifier

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.

FEATURES

•  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 two-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 •  3-year warranty.

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

•  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%

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-inch), 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 mi