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QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier
  • QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier
  • QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier
  • QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier
  • QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier
  • QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier
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QSC RMX-850A 300 W/CH 830 W Bridged Power Amplifier

Manufacturer: QSC

Item #: QSC-RMX-850A   •   MFG #: RMX-850A


List Price:$479.99
Our Price:$399.99

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Availability: Usually ships in 3-10 business days
This item is currently out of stock and will ship the minute we receive it – normally 3-10 business days. Need it sooner? Call 800-522-2025 and we'll make it happen,or email Customer Service for expedited delivery options. Certain Non-Stock Items Valued over $50.00 may Ship FREE UPS GROUND in the Continental US. Multiple quantities of the same non-Stock Item Valued below $50.00 may be ordered to meet the $50 minimum order requirement to qualify for Free UPS Ground Freight. This offer does not apply to certain freight-intensive or hazardous items. Certain restrictions may apply.
  • Special Order Item: non-cancelable, non-returnable, non-refundable.



The RMXa Series is an update on a proven line of amplifiers line of amplifiers combining legendary QSC reliability, audio performance and affordability. 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 4O 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. 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, Speakon and binding post outposts for convenient connectivity. User-defeatable clip limiters and selectable low-frequency filters optimize sonic performance.

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.
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.

  • Features

    • Compact size - up to 2400 watts in 2 rack spaces
    • 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" (6.3mm) 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
    • Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
    • 3-year warranty plus optional 3-year extended service contract
  • Specifications

    • Distortion (Typical)
    • 20 Hz - 20 kHz: 10 dB below rated power
    • 1.0 kHz and below: full rated power
    • Less than 0.03% THD, 4 and 8 ohms
    • Less than 0.03% THD, 4 and 8 ohms
    • Frequency Response 20 Hz-20 kHz, ±1 dB
    • -3 dB points: 5 Hz - 50 kHz
    • Damping Factor, 1 kHz and below Greater than 300 at 8 ohms
    • Input Impedance 10k ohms unbalanced, 20k ohms balanced
    • Input Clipping 10 Vrms (+22 dBu)
    • Cooling Continuously variable-speed fan, rear-to-front air flow
    • Connectors, each channel Input: Active balanced; barrier strip, XLR and 1/4" (6.3mm)
    • TRS tip and XLR (pin 2 positive)
    • Output: touch-proof binding posts and Neutrikr Speakonr
    • Controls Front: AC switch, Ch. 1 and Ch. 2 gain knobs
    • Rear: 10-position DIP switch
    • Indicators Power-On: Green LED
    • Signal: Yellow LED (1 per channel)
    • Clip: Red LED (1 per channel)
    • Amplifier Protection Stable into reactive or mismatched loads
    • Load Protection On/off muting, AC coupling (850, 1450), triac crowbar (1850HD, 2450, on each channel)
    • Power Requirements 100, 120, 230 VAC, 50-60 Hz
    • Dimensions 19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 RU),
    • 15.9" (40 cm) deep (rack mounting to rear support ears)

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