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

• 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-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

 ModelRMX 850aRMX 1450aRMX 2450aRMX 4050aRMX 5050aPower per Channel, Stereo Mode (both channels driven)8Ω, FTC 20 Hz–20 kHz, 0.1% tdD

• 185 W

• 260 W

• 450 W

• 800 (650**) W

• 1050 W

8Ω, EIA 1 kHz, 0.1% tdD

• 200 W

• 300 W

• 500 W

• 850 W

• 1100 W

4Ω, FTC 20 Hz–20 kHz, 0.1% tdD

• 280 W

• 400 W

• 650 W

• 1300 W

• 1600 W

4Ω, EIA 1 kHz, 0.1% tdD

• 300 W

• 500 W (0.5% tdD)

• 800 W

• 1400 W

• 1800 W

2Ω, FTC 20 Hz–20 kHz, 1% tdD

• –

• –

• –

• 1600 W

• 2000 W

2Ω, EIA 1 kHz, 1% tdD

• 430 W

• 700 W

• 1200 W

• 2000 W

• 2500 W

Power, Bridge-Mono Mode8Ω, FTC 20 Hz–20 kHz, 0.1% tdD

• 530 W

• 800 W

• 1300 W

• 2600 W

• 3200 W

8Ω, EIA 1 kHz, 0.1% tdD

• 600 W

• 900 W

• 1500 W

• 2800 W

• 3600 W

4Ω, EIA 1 kHz, 1% tdD

• 830 W

• 1400 W

• 2400 W

• 4000 W

• 5000 W

Signal to Noise (20 Hz–20 kHz)

• -100 dB

Distortion (SMPTE-IM)

• < 0.01%

< 0.02%Input Sensitivity at 8Ω

• 1.15V (+3.4dBu)

• 1.23V
• (+4.0 dBu)

• 1.42V (+5.3 dBu)

Voltage Gain

• 31.6x (30 dB)

• 40x (32 dB)

• 50x (34 dB)

• 64x (36 dB)

Output Circuitry

• Class AB

2-tier Class H3-tier Class HCurrent 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 5-20
CEE7/7Weight
Net
Shipping

• 15.9 kg / 35 lb
• 18.6 kg / 41 lb

• 18.2 kg / 40 lb
• 20.9 kg / 46 lb

• 20.2 kg / 44.5 lb
• 23 kg / 50.5 lb

• 30.8 kg / 68 lb
• 34.9 kg / 77 lb

• 33.1 kg / 75 lb
• 37.6 kg / 87 lb

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

• < 0.02% tdD, 4Ω and 8Ω
• < 0.02% 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

> 250 at 8ΩInput 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®

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

Dimensions

• 610 × 560 × 153 mm

• 24 × 22 × 6 in

610 × 560 × 229 mm

24 × 22 × 9 in

Power Requirements

• 100, 120, 230 V AC (factory configured), 50–60 Hz