QSC RMX4050a 2 channels, 850w /ch @ 8-Ohm, 1400w /ch @ 4-Ohm, 2000w /ch @ 2-Ohm, 4000w /ch @ 4-Ohm (bridged)
With 1400 watts per channel into 4 Ω and 2000 into 2 Ω, all in a chassis that is less than 16" deep, the RMX4050a is perfectly suited for performing musicians. The RMXa Series is an update on a proven line of amplifiers
Features
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Compact size — up to 2500 watts in two rack spaces, or 5000 watts in three rack spaces
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High-current toroidal transformers, for greater 2-ohm power and low noise
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Independent user-defeatable clip limiters reduce distortion
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Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
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The 4000-watt RMX4050a operates on a standard 15 amp plug (120V)
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Both the RMX4050a and the RMX5050a feature a dual mono, high-current power supply for increased reliability and performance
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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.
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Balanced 1/4-inch (6.3 mm) TRS, XLR, and barrier strip inputs
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Touch-proof binding post and Neutrik Speakon® outputs
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Front mounted gain controls for easy access
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Signal and clip LED indicators for monitoring performance
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Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
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3-year warranty plus optional 3-year extended service contract
| Model |
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% tdD |
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| 8Ω, EIA 1 kHz, 0.1% tdD |
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| 4Ω, FTC 20 Hz–20 kHz, 0.1% tdD |
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| 4Ω, EIA 1 kHz, 0.1% tdD |
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| 2Ω, FTC 20 Hz–20 kHz, 1% tdD |
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| 2Ω, EIA 1 kHz, 1% tdD |
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| Power, Bridge-Mono Mode |
| 8Ω, FTC 20 Hz–20 kHz, 0.1% tdD |
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| 8Ω, EIA 1 kHz, 0.1% tdD |
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| 4Ω, EIA 1 kHz, 1% tdD |
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| Signal to Noise (20 Hz–20 kHz) |
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| Distortion (SMPTE-IM) |
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< 0.02% |
| Input Sensitivity at 8Ω |
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| Voltage Gain |
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| Output Circuitry |
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2-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* |
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AC Mains Plug
100/120V
230V |
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NEMA 5-20
CEE7/7 |
Weight
Net
Shipping |
- 15.9 kg / 35 lb
- 18.6 kg / 41 lb
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- 18.2 kg / 40 lb
- 20.9 kg / 46 lb
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- 20.2 kg / 44.5 lb
- 23 kg / 50.5 lb
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- 30.8 kg / 68 lb
- 34.9 kg / 77 lb
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- 33.1 kg / 75 lb
- 37.6 kg / 87 lb
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Distortion (typical)
20 Hz–20 kHz, 10 dB below rated power
1 kHz and below, full rated power |
- < 0.03% tdD, 4Ω and 8Ω
- < 0.03% tdD, 4Ω and 8Ω
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- < 0.02% tdD, 4Ω and 8Ω
- < 0.02% tdD, 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)
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| Damping Factor (1 kHz and below) |
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> 250 at 8Ω |
| Input Impedance |
- 10 kΩ unbalanced; 20 kΩ balanced
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| Input Stage Clipping |
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6.4 V rms (+18 dBu) |
| Cooling |
- Continuously variable speed fan, back-to-front air flow
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| 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)
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| Amplifier Protection |
- Full short circuit, open circuit, tdermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
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| Load Protection |
- Turn-on/off muting; AC coupling (850, 1450); Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
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| Dimensions |
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610 × 560 × 229 mm
24 × 22 × 9 in |
| Power Requirements |
- 100, 120, 230 V AC (factory configured), 50–60 Hz
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