QSC RMX 4050a Power Amplifier

Rely on this workhorse QSC amplifier to power your passive PA system. With the super-efficient RMX 4050a, you get 1400 watts per channel into 4 ohms.

The QSC RMX 4050a Power Amplifier is a heavy duty amp designed for mid-size to large systems and works as hard into 2 ohm loads as most competing amps will at 4 ohms. The three-tier, Class H design is extremely efficient at real world power levels so you always get a powerful, clean sound. QSC designed the RMX 4050a so that less AC current is wasted and more available current goes into producing useful audio power. All this is accomplished with a standard 15 amp plug.

Check out our overview of the QSC RMX 4050a Power Amplifier:

Huge Wattage on a Standard 15 Amp Circuit

The RMX 4050 operates on a standard 15A circuit, using the enclosed detachable IEC power cord. Note that the 4000-watt rating is when the amp is driven in Bridge Mode at 4 Ohms. Bridge Mode combines both channels into a single channel with twice the output power. Use only the first channel's input and Gain control. Set the second channel's Gain control at minimum. The load must be rated for the higher output power and is connected as shown in the Outputs section. Clip limiters on each channel can be engaged using the rear on-off switches. Clip limiters are recommended and should be used to protect high frequency drivers, especially at higher volumes.


- Professional quality performance -- incorporates road-proven QSC designs
- 4000 watt RMX 4050a operates on a standard 15 amp plug (120V)
- 1400W per channel at 4 ohms
- Dual mono, high-current power supply for increased reliability and read more performance
- Improved thermal performance yielding higher continuous power in 2 ohm stereo or 4 ohm bridged applications
- 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 inch 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 to monitor performance
- Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
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- Power Output:
- Stereo Per Channel
-- 8-ohms: 850W
-- 4-ohms: 1400W
-- 2-ohms: 2000W
- Bridged Mono:
-- 4-ohms: 4000W
- Dimensions: 5.25 inches (13.3 cm) tall / 3 rack spaces
- Weight: 68lbs (30.8 kg)
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 79.5 lbs
Shipping Dimensions: 26 x 22 x 8 in
Manufacturer Part Number (MPN): RMX4050a
Blemished, USED
Shipping Weight: 79.5 lbs
Shipping Dimensions: 26 x 22 x 8 in
Manufacturer Part Number (MPN): RMX4050a

For support or warranty questions, please contact the manufacturer:
Phone: 800-772-2834
Web: http://qsc.com/support


  • 18 x
  • 12 x
    $150.00 with zZounds
  • 8 x
    $225.00 with zZounds
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