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¢ç 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 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 8¥Ø/ FTC 20 Hz – 20 kHz / 0.1% THD 200 W 300 W 500 W 850 W 1100 W 8¥Ø/ EIA 1 kHz / 0.1% THD 280 W 400 W 650 W 1300 W 1600 W 4¥Ø/ FTC 20 Hz – 20 kHz / 0.1% THD 300 W 500 W (0.5% THD) 750 W 1400 W 1800 W 4¥Ø/ EIA 1 kHz / 0.1% THD – – – 1600 W 2000 W 2¥Ø/ FTC 20 Hz – 20 kHz / 1% THD 430 W 700 W 1200 W 2000 W 2500 W 2¥Ø/ EIA 1 kHz / 1% THD Bridge-Mono Mode 530 W 800 W 1300 W 2600 W 3200 W 8¥Ø/ FTC 20 Hz – 20 kHz / 0.1% THD 600 W 900 1500 W 2800 W 3600 W 8¥Ø/ EIA 1 kHz / 0.1% THD 830 W 1400 W 2400 W 4000 W 5000 W 4¥Ø/ EIA 1 kHz / 1% THD Signal to Noise (20 Hz – 20 kHz) 8¥Ø > -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 8¥Ø 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 Typical, 1/8 power pink noise at 4¥Ø* 6.6 A 9.6 A 15.6 A 20.1 A 26.9 A Severe, 1/3 power pink noise at 4¥Ø* 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) 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) Shipping Distortion (typical) 20 Hz – 20 kHz: 10 dB below rated power < 0.03% THD / 4¥Øand 8¥Ø < 0.02% THD / 4¥Øand 8¥Ø 1.0 kHz and below: full rated power < 0.03% THD / 4¥Øand 8¥Ø < 0.02% THD / 4¥Øand 8¥Ø Frequency Response 20 Hz – 20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed / 8¥Ø) Damping Factor (1 kHz and below) > 300 at 8¥Ø > 250 at 8¥Ø 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+) Output: Touch-proof binding posts / Neutrik Speakon¢ç Controls Front: AC switch / Ch. 1 & 2 gain knobs 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)