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HomepageLive SoundPower Amplifiers › QSC RMX4050

The RMXa Series is an update on a proven line of amplifiers line of amplifiers combining legendary QSC reliability, audio performance and affordability. 1400W per channel into 4Ohm

Entertainers and touring users can continue to rely on the RMXa as one of the leading amplifier series in the world. For mid-power applications, the 2RU models offer 4 power ratings from 300 to 800 watts per channel. For premium loudspeaker systems with extremely high power capacity the 3RU models (RMX 4050a and RMX 5050a) are unchallenged.

The RMXa Series amplifiers from QSC offer true professional-quality performance at an affordable price.

Rackspace and Comprehensive Features
Three 2-rackspace models range in power from 430 to 1200 watts per channel at 2 ohms. Two 3-rackspace models provide 2000 to 2500 watts per channel at 2 ohms. All five models feature a compact chassis less than 16" deep.

RMXa amplifiers include a comprehensive set of features including XLR and 1/4" balanced inputs, SpeakonĀ® and binding post outposts for convenient connectivity. User-defeatable clip limiters and selectable low-frequency filters optimize sonic performance.

Sustained Power, Extraordinary Performance and Reliability.
QSC's RMX 5050a power amplifier represents 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 entertainers, the RMX 5050a is optimized to deliver high levels of sustained power, extraordinary audio performance and road-proven reliability.

The RMX 4050a is a "heavy duty" model designed to work as hard into 2 ohm loads as most competing amplifiers will at 4 ohms.

Three-tier, Class H Design
Both the RMX 5050a and RMX 4050a feature a three-tier, Class H design that is extremely efficient at real world power levels. Less AC current is wasted and more available current goes into producing useful audio power. 120 volt versions of the RMX4050a accomplish all this with a standard 15 amp plug
  • Compact size - up to 2500 watts in two rack spaces, or 5000 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)
  • Both the RMX4050a and the RMX5050a feature a dual mono, high-current power supply for increased reliability and performance
  • The RMX4050a's particularly 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 SpeakonĀ® 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
  • Specifications
    8, FTC 20 Hz-20 kHz, 0.1% tdD: 800 (650**) W
    8, EIA 1 kHz, 0.1% tdD: 850 W
    4, FTC 20 Hz-20 kHz, 0.1% tdD: 1300 W
    4, EIA 1 kHz, 0.1% tdD: 1400 W
    2, FTC 20 Hz-20 kHz, 1% tdD: 1600 W
    2, EIA 1 kHz, 1% tdD: 2000 W

    Power, Bridge-Mono Mode
    8, FTC 20 Hz-20 kHz, 0.1% tdD: 2600 W
    8, EIA 1 kHz, 0.1% tdD: 2800 W
    4, EIA 1 kHz, 1% tdD: 4000 W
    Signal to Noise (20 Hz-20 kHz): -100 dB

    Distortion (SMPTE-IM): < 0.02%
    Input Sensitivity at 8: 1.42V (+5.3 dBu)
    Voltage Gain: 64x (36 dB)
    Output Circuitry: 3-tier Class Hz-2

    Current Draw (120 V AC)
    Typical, 1/8 power pink noise at 4*: 10.0 A
    Severe, 1/3 power pink noise at 4*: 20.1 A
    AC Mains Plug 100/120V: NEMA 5-15
    AC Mains Plug 230V: CEE7/7

    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% tdD, 4 and 8
    1 kHz and below, full rated power: < 0.02% tdD, 4 and 8

    Frequency Response: 20 Hz-20 kHz: +0/-1 dB - kHz (LF filter bybassed, 8)

    Damping Factor (1 kHz and below): > 250 at 8
    Input Impedance: 10 k unbalanced; 20 k 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 SpeakonĀ®

    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, tdermal, 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
    Joel Tatelman
    Toronto, ON
    December 15, 2016
    QSC RMX4050a: power and clarity
    An excellent amp in all respects, though probably, at almost 70 lbs., heavier than most would want for touring. But a good linear power supply means big trannies and big weight! I purchased mine for powering stereo subwoofers in a large (18,000 cu. ft.) listening room, and that the RMX-4050a does effortlessly, whatever the output required. My only caveat is that if you are troubled by fan noise, this is not the amp for you. In fairness, though, QSC was not targeting home listeners when they designed the amp. At some point I'll investigate fitting quieter fans.
    Free shipping in Canada. Conditions
    Additional information
    For more information about the RMX4050, please visit the website of QSC
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