QSC RMX850a Power Amplifier 300 Watt Two Channel Power Amplifier
QSC RMX850a Power Amplifier 300 Watt Two Channel Power Amplifier

QSC RMX850a Power Amplifier 300 Watt Two Channel Power Amplifier


Precio habitual $549.99 USD



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  • 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 (120 V)
  • 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-inch (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 for monitoring 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
Power per Channel, Stereo Mode (both channels driven)
8Ω, FTC 20 Hz–20 kHz, 0.1% tdD 185 W
8Ω, EIA 1 kHz, 0.1% tdD 200 W
4Ω, FTC 20 Hz–20 kHz, 0.1% tdD 280 W
4Ω, EIA 1 kHz, 0.1% tdD 300 W
2Ω, FTC 20 Hz–20 kHz, 1% tdD
2Ω, EIA 1 kHz, 1% tdD 430 W
Power, Bridge-Mono Mode
8Ω, FTC 20 Hz–20 kHz, 0.1% tdD 530 W
8Ω, EIA 1 kHz, 0.1% tdD 600 W
4Ω, EIA 1 kHz, 1% tdD 830 W
Signal to Noise (20 Hz–20 kHz) -100 dB
Distortion (SMPTE-IM) < 0.01%
Input Sensitivity at 8Ω 1.15V (+3.4dBu)
Voltage Gain 31.6x (30 dB)
Output Circuitry Class AB
Current Draw (120 V AC)  
Typical, 1/8 power pink noise at 4Ω* 4.5 A
Severe, 1/3 power pink noise at 4Ω* 6.6 A
AC Mains Plug NEMA 5-15
100/120V CEE7/7
Distortion (typical)  
20 Hz–20 kHz, 10 dB below rated power < 0.03% tdD, 4Ω and 8Ω
1 kHz and below, full rated power < 0.03% tdD, 4Ω and 8Ω
Frequency Response 20 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 Impedance 10 kΩ unbalanced; 20 kΩ balanced
Input Stage Clipping 10 V rms (+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; 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
Product Dimensions (H×W×D) 89 (2 RU) × 482 × 404 mm
3.5 (2 RU) × 19 × 15.9 in
Carton Dimensions (H×W×D) 610 × 560 × 153 mm
24 × 22 × 6 in
Net Weight 15.9 kg / 35 lb
Shipping Weight 18.6 kg / 41 lb
Power Requirements 100, 120, 230 V AC (factory configured), 50–60 Hz