Untitled Document
QSC RMX1450a Stereo Power Amplifier
Professional quality performance—incorporates road-proven QSC designs
• The 4000 watt RMX 4050a operates on a standard 15 amp plug (120V)
• Both the RMX 4050a and RMX 5050a feature a dual mono, high-current power supply for increased reliability and performance
• The RMX 4050a provides improved thermal performance yielding higher continuous power in 2 ohm stereo or 4 ohm bridged applications.
• Compact size — up to 2500 watts in 2 rack spaces or 5000 watts in 3 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
• 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
• 3-year warranty plus optional 3-year extended service contract
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RMX 850a |
RMX 1450a |
RMX 2450a |
RMX 4050a |
RMX 5050a |
| Stereo Mode (both channels driven) |
185 W |
260 W |
450 W |
800 (650**) W |
1050 W |
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| 8Ω/ FTC 20 Hz – 20 kHz / 0.1% THD |
200 W |
300 W |
500 W |
850 W |
1100 W |
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| 8Ω/ EIA 1 kHz / 0.1% THD |
280 W |
400 W |
650 W |
1300 W |
1600 W |
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| 4Ω/ FTC 20 Hz – 20 kHz / 0.1% THD |
300 W |
500 W (0.5% THD) |
750 W |
1400 W |
1800 W |
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| 4Ω/ EIA 1 kHz / 0.1% THD |
– |
– |
– |
1600 W |
2000 W |
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| 2Ω/ FTC 20 Hz – 20 kHz / 1% THD |
430 W |
700 W |
1200 W |
2000 W |
2500 W |
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| 2Ω/ EIA 1 kHz / 1% THD |
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| Bridge-Mono Mode |
530 W |
800 W |
1300 W |
2600 W |
3200 W |
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| 8Ω/ FTC 20 Hz – 20 kHz / 0.1% THD |
600 W |
900 |
1500 W |
2800 W |
3600 W |
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| 8Ω/ EIA 1 kHz / 0.1% THD |
830 W |
1400 W |
2400 W |
4000 W |
5000 W |
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| 4Ω/ EIA 1 kHz / 1% THD |
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| Signal to Noise (20 Hz – 20 kHz) 8Ω |
> -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 |
| Power Requirements |
4.5 A |
6.0 A |
6.3 A |
10.0 A |
13.9 A |
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| Typical, 1/8 power pink noise at 4Ω* |
6.6 A |
9.6 A |
15.6 A |
20.1 A |
26.9 A |
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| Severe, 1/3 power pink noise at 4Ω* |
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| Supplied Plug Type, 100/120V |
NEMA 5-15 |
NEMA 5-15 |
NEMA 5-15 |
NEMA 5-15 |
NEMA 5-20 |
| Supplied Plug Type, 230V |
CEE7/7 |
CEE7/7 |
CEE7/7 |
CEE7/7 |
CEE7/7 |
| Weight |
35 lb (15.9 kg) |
40 lb (18.2 kg) |
44.5 lb (20.2 kg) |
68 lb (30.8 kg) |
75 lb (33.1 kg) |
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| Net |
41 lb (18.6 kg) |
46 lb (20.9 kg) |
50.5 lb (23 kg) |
77 lb (34.9 kg) |
87 lb (37.2 kg) |
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| Shipping |
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| Distortion (typical) |
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| 20 Hz – 20 kHz: 10 dB below rated power |
< 0.03% THD / 4Ωand 8Ω |
< 0.02% THD / 4Ωand 8Ω |
| 1.0 kHz and below: full rated power |
< 0.03% THD / 4Ωand 8Ω |
< 0.02% THD / 4Ωand 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 |
> 250 at 8Ω |
| Input Impedance |
10k ohms unbalanced / 20k ohms balanced |
| Input Clipping |
10 Vrms (+22 dBu) |
6.4 Vrms (+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+) |
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Output: Touch-proof binding posts / Neutrik Speakon® |
| Controls |
Front: AC switch / Ch. 1 & 2 gain knobs |
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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” (8.9 cm) tall / 2 rack spaces |
5.25” (13.3 cm) tall / 3 rack spaces |
| Power Requirements |
100, 120, 230 VAC, 50 – 60 Hz (factory configured) |
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 WARNING: This product contains chemicals including Styrene which is known to the state of California to cause cancer, and Bisphenol A (BPA), which is known to the state of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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