QSC RMX850a Professional Power Amplifier

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

FEATURES

• 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” (6.3 mm) 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

SPECIFICATIONS

Stereo Mode (both channels driven):

8Ω / FTC 20 Hz – 20 kHz / 0.1% THD: 185 W

8Ω / EIA 1 kHz / 0.1% THD: 200 W

4Ω / FTC 20 Hz – 20 kHz / 0.1% THD: 280 W

4Ω / EIA 1 kHz / 0.1% THD: 300 W

2Ω / EIA 1 kHz / 1% THD: 430 W

Bridge-Mono Mode:

8Ω / FTC 20 Hz – 20 kHz / 0.1% THD: 530 W

8Ω / EIA 1 kHz / 0.1% THD: 600 W

4Ω / EIA 1 kHz / 1% THD: 830 W

Signal to Noise (20 Hz – 20 kHz) 8Ω: > -100 dB

Distortion (SMPTE-IM): < 0.01%

Input Sensitivity at 8Ω: 1.15V (+3.4 dBu)

Voltage Gain: 31.6x (30 dB)

Output Circuitry: Class AB

Power Requirements:

Typical, 1/8 power pink noise at 4Ω*: 4.5 A

Severe, 1/3 power pink noise at 4Ω*: 6.6 A

Supplied Plug Type, 100/120V: NEMA 5-15

Supplied Plug Type, 230V: CEE7/7

Weight:

Net: 35 lb (15.9 kg)

Shipping: 41 lb (18.6 kg)

Distortion (typical):

20 Hz – 20 kHz: 10 dB below rated power: < 0.03% THD / 4Ω and 8Ω

1.0 kHz and below: full rated power: < 0.03% THD / 4Ω and 8Ω

Frequency Response: 20 Hz – 20 kHz: +0/-1 dB

Damping Factor (1 kHz and below): > 300 at 8Ω

Input Impedance: 10k ohms unbalanced / 20k ohms balanced

Input Clipping: 10 Vrms (+22 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 Speakon®

Controls:

Front: AC switch / Ch. 1 & 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) | Protect: Red LED

Amplifier Protection: Full short circuit, open circuit, thermal, 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: 3.5-in (8.9 cm) tall / 2 rack spaces

Power Requirements: 100, 120, 230 VAC, 50 – 60 Hz (factory configured)

CONTENTS

(1) QSC RMX850a Professional Power Amplifier
(1) US Power Cord
(1) Operator's Instructions