QSC RMX850a 2 Channel Power Amp
RMXa Series: Professional quality performance, incorporating road-proven QSC designs
- 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 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
| RMX 850a | RMX 1450a | RMX 2450a | RMX 4050a | RMX 5050a | |
|---|---|---|---|---|---|
| Power per Channel, Stereo Mode (both channels driven) | |||||
| 8Ω, FTC 20 Hz–20 kHz, 0.1% THD | 185 W | 260 W | 450 W | 800 (650**) W | 1050 W |
| 8Ω, EIA 1 kHz, 0.1% THD | 200 W | 300 W | 500 W | 850 W | 1100 W |
| 4Ω, FTC 20 Hz–20 kHz, 0.1% THD | 280 W | 400 W | 650 W | 1300 W | 1600 W |
| 4Ω, EIA 1 kHz, 0.1% THD | 300 W | 500 W (0.5% THD) | 750 W | 1400 W | 1800 W |
| 2Ω, FTC 20 Hz–20 kHz, 1% THD | – | – | – | 1600 W | 2000 W |
| 2Ω, EIA 1 kHz, 1% THD | 430 W | 700 W | 1200 W | 2000 W | 2500 W |
| Power, Bridge-Mono Mode | |||||
| 8Ω, FTC 20 Hz–20 kHz, 0.1% THD | 530 W | 800 W | 1300 W | 2600 W | 3200 W |
| 8Ω, EIA 1 kHz, 0.1% THD | 600 W | 900 W | 1500 W | 2800 W | 3600 W |
| 4Ω, EIA 1 kHz, 1% THD | 830 W | 1400 W | 2400 W | 4000 W | 5000 W |
| Signal to Noise (20 Hz–20 kHz) | -100 dB | -100 dB | -100 dB | -100 dB | -100 dB |
| Distortion (SMPTE-IM) | < 0.01% | < 0.01% | < 0.02% | < 0.02% | < 0.02% |
| Input Sensitivity at 8Ω | 1.15V (+3.4dBu) | 1.15V (+3.4 dBu) | 1.23V (+4.0 dBu) | 1.42V (+5.3 dBu) | 1.42V (+5.3 dBu) |
| Voltage Gain | 31.6x (30 dB) | 40x (32 dB) | 50x (34 dB) | 64x (36 dB) | 64x (36 dB) |
| Output Circuitry | Class AB | Class AB | 2-tier Class H | 3-tier Class H | 3-tier Class H |
| 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 |
6.0 A 9.6 A |
6.3 A 15.6 A |
10.0 A 20.1 A |
13.9 A 26.9 A |
| AC Mains Plug 100/120V 230V |
NEMA 5-15 CEE7/7 |
NEMA 5-15 CEE7/7 |
NEMA 5-15 CEE7/7 |
NEMA 5-15 CEE7/7 |
NEMA 5-20 CEE7/7 |
| Weight Net Shipping |
35 lb (15.9 kg) 41 lb (18.6 kg) |
40 lb (18.2 kg) 46 lb (20.9 kg) |
44.5 lb (20.2 kg) 50.5 lb (23 kg) |
68 lb (30.8 kg) 77 lb (34.9 kg) |
75 lb (33.1 kg) 87 lb (37.2 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 |
< 0.02% THD, 4Ω and 8Ω < 0.02% THD, 4Ω and 8Ω |
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| 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 | > 250 at 8Ω | |||
| Input Impedance | 10 kΩ unbalanced; 20 kΩ balanced | ||||
| Input Stage Clipping | 10 V rms (+22 dBu) | 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 Speakon® |
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| Controls | Front: AC switch; Channel 1 & 2 gain knobs Rear: 10-position DIP switch |
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| LED Indicators | Power on: Green; Signal: Yellow (1 per channel); Clip/Protect: Red (1 per channel) | ||||
| 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” (8.9 cm) tall; 2 rack spaces | 5.25” (13.3 cm) tall; 3 rack spaces | |||
| Power Requirements | 100, 120, 230 V AC (factory configured), 50–60 Hz | ||||
