QSC RMX2450a Power Amplifier, 750W @ 4 Ohms

The QSC RMX2450a Power Amplifier offers true professional-quality performance at an affordable price. Three 2-rackspace models range in power from 430 to 1200 watts per channel at 2 ohms. Two 3-rackspace models provide 2000 to 2500 watts per channel at 2 ohms. All five models feature a compact chassis less than 16-in deep. RMXa amplifiers include a comprehensive set of features including XLR and ¼-inch balanced inputs, Speakon and binding post outposts for convenient connectivity. User-defeatable clip limiters and selectable low-frequency filters optimize sonic performance.

QSC RMX2450a Power Amplifier 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 (120 V)
- 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 ¼-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

QSC RMX2450a Power Amplifier Specifications

- Power per Channel, Stereo Mode (both channels driven):
  - 8Ω, FTC 20 Hz–20 kHz, 0.1% THD: 450 W
  - 8Ω, EIA 1 kHz, 0.1% THD: 500 W
  - 4Ω, FTC 20 Hz–20 kHz, 0.1% THD: 650 W
  - 4Ω, EIA 1 kHz, 0.1% THD: 750 W
  - 2Ω, EIA 1 kHz, 1% THD: 1200 W
- Power, Bridge-Mono Mode:
  - 8Ω, FTC 20 Hz–20 kHz, 0.1% THD: 1300 W
  - 8Ω, EIA 1 kHz, 0.1% THD: 1500 W
  - 4Ω, EIA 1 kHz, 1% THD: 2400 W
- Signal to Noise (20 Hz–20 kHz): -100 dB
- Distortion (SMPTE-IM): < 0.02%
- Input Sensitivity at 8Ω: 1.23V (+4.0 dBu)
- Voltage Gain: 50x (34 dB)
- Output Circuitry: 2-tier Class H
- Current Draw (120 V AC):
  - Typical, 1/8 power pink noise at 4Ω: 6.3 A
  - Severe, 1/3 power pink noise at 4Ω: 15.6 A
- Distortion (typical):
  - 20 Hz–20 kHz, 10 dB below rated power: <0.03% THD, 4Ω and 8Ω
  - 1 kHz and below, full rated power: < 0.03% THD, 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
- Input Impedance: 10 kΩ unbalanced; 20 kΩ balanced
- Input Stage Clipping: 10 V rms (+22 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, 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
- Power Requirements: 100, 120, 230 V AC (factory configured), 50–60 Hz

Physical:
- Dimensions (W x H x D): 483 x 89 x 404 mm
- Weight: 20.2 kg