This is a demo store. No orders will be fulfilled.

Shop by Brand Deals Under $150 Frontboards LED Dance Floors Sound Packs DJ Starter Packs
QSC RMX 850a 2-Channel Power Amplifier

QSC RMX 850a Two-Channel Power Amplifier

SKU #: RMX850
$749.99

Notify me when in stock

We'll let you know once this product is back in stock. Simply add your email address and click the "Notify Me" button. As soon as we have more you will receive a notification.

Item Backordered

Expected June 30, 2025

Only at IDJ NOW

Fast Shipping

Fast Shipping

Most products ship same-day

30-Day Price Protection

30-Day Price Protection

Find a lower price, you're covered.

8000+ Reviews

8000+ Reviews

95%+5-star reviews>

30-Day Returns

30-Day Returns

Don't Like it? Return most items.

The RMXa Series amplifiers offer true professional-quality performance at an affordable price. With 300 watts per channel into 4 ohms and 430 into 2 ohms, all in a chassis that is less than 16" deep, the RMX850a is perfectly suited for performing musicians and mobile entertainers.

QSC RMX850a Two Channel Power Amplifier Features:

  • Compact 2 rack space size.
  • Up to 860 watts in bridge-mono & 430 watts in stereo mode.
  • 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.

QSC RMX 850a Specifications
 RMX 850a
Power per Channel, Stereo Mode (both channels driven)
8Ω, FTC 20 Hz–20 kHz, 0.1% THD185 W
8Ω, EIA 1 kHz, 0.1% THD200 W
4Ω, FTC 20 Hz–20 kHz, 0.1% THD280 W
4Ω, EIA 1 kHz, 0.1% THD300 W
2Ω, FTC 20 Hz–20 kHz, 1% THD–
2Ω, EIA 1 kHz, 1% THD430 W
Power, Bridge-Mono Mode
8Ω, FTC 20 Hz–20 kHz, 0.1% THD530 W
8Ω, EIA 1 kHz, 0.1% THD600 W
4Ω, EIA 1 kHz, 1% THD830 W
Signal to Noise (20 Hz–20 kHz)-100 dB
Distortion (SMPTE-IM)< 0.01%
Input Sensitivity at 8Ω1.15V (+3.4dBu)
Voltage Gain31.6x (30 dB)
Output CircuitryClass AB
Current Draw (120 V AC)
Typical, 1/8 power pink noise at 4Ω*
Severe, 1/3 power pink noise at 4Ω*
4.5 A
6.6 A
AC Mains Plug
 100/120V
 230V
NEMA 5-15
CEE7/7
Weight
 Net
 Shipping 
35 lb (15.9 kg)
41 lb (18.6 kg) 
Distortion (typical)
 20 Hz–20 kHz, 10 dB below rated power
 1 kHz and below, full rated power
< 0.03% THD, 4Ω and 8Ω
< 0.03% THD, 4Ω and 8Ω
Frequency Response20 Hz–20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed, 8Ω)
Damping Factor (1 kHz and below)> 300 at 8Ω
Input Impedance10 kΩ unbalanced; 20 kΩ balanced
Input Stage Clipping10 V rms (+22 dBu)
CoolingContinuously 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® 
ControlsFront: AC switch; Channel 1 & 2 gain knobs
Rear: 10-position DIP switch 
LED IndicatorsPower on: Green; Signal: Yellow (1 per channel); Clip/Protect: Red (1 per channel)
Amplifier ProtectionFull short circuit, open circuit, thermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
Load ProtectionTurn-on/off muting; AC coupling (850, 1450); Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
Dimensions3.5” (8.9 cm) tall; 2 rack spaces
Power Requirements100, 120, 230 V AC (factory configured), 50–60 Hz

The RMX 850a Box Includes:

(1) QSC RMX 850a Amplifier
(1) Quick Start Guide
(1) Adhesive Rubber Feet Kit (For non rack-mount applications)
(1) Rear Rack Ear Mounting Kit
(1) IEC Detachable Power Cord

loader
Loading...