QSC CX254 4-Channel Power Amplifier - USED

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The QSC CX 4-channel series is a line of four channel amplifiers designed for installation applications requiring premium sound quality and high output. Recognized by sound contractors worldwide for their reliability, CX 4-channel amplifiers feature PowerLight™ power supply technology reducing weight, eliminating AC mains hum and improving audio quality. The highly efficient power supply also draws less power and produces less heat resulting in added energy savings. CX 4-channel amplifiers also feature advanced amplifier control and monitoring via the Q-SYS™ network audio platform.


  • Compact size — only 2 RU and 14" deep for reduced rack cost and floor space
  • Bridgeable channels 1 + 2 and 3 + 4, for maximum flexibility
  • Active inrush limiting eliminates AC inrush current, removing the need for expensive power sequencers
  • HD15 DataPort connector for Q-SYS networked control and monitoring
  • Custom integrated security cover for tamper-proof installations
  • Variable-speed fan for low noise
  • 1-dB detented gain controls for fast and accurate gain settings
  • Detachable Euro style input connectors
  • DIP switch control for clip limiters, high pass filters, bridge mono and parallel operation
  • Exclusive PowerLight switch-mode power supply technology for high performance and compact size
  • Selectable high-pass filters protect speakers and prevent speaker transformer saturation with minimal effect on program material (50 Hz or 75 Hz)
  • Comprehensive front panel indicators including signal, clip, protect and QSC's exclusive bridge mono and parallel input LEDs
  • Barrier strip output connector
  • Comprehensive protection circuitry including DC, infrasonic, thermal overload and short circuit protection
  • High-performance Class AB+B complementary bipolar output circuitry
  • Lightweight—all models only 21 pounds (9.5 kg) for easier racking and shipping
  • All CX Series amplifiers meet the European Union's, 2006 RoHS directive to restrict the use of hazardous materials used in electronic devices.
Power Amplifier
Number of Channels 4
Power Rating 2 Ohms:
450 W per Channel
4 Ohms:
250 W per Channel
900 W Bridged
8 Ohms:
170 W per Channel
500 W Bridged
16 Ohms:
340 W Bridged
Protections Security Cover
Frequency Response 20 Hz to 20 kHz ±0.2 dB
8 Hz to 50 kHz +0/-3 dB
Damping Factor >500
Input Sensitivity 1.22 Vrms
Input Impedance 12 Kilohms (Balanced)
6 Kilohms (Unbalanced)
Max Gain 29 dB (at 8 Ohms)
Signal Processing
Filters 2 x High-Pass:
33 Hz / 75 Hz
I/O 1 x Barrier Strip 6-Pin Output
4 x Euroblock 3-Pin Input
Digital I/O 2 x DE-15/DB-15 DataPort Input
Current Consumption 120 VAC, 2 Ohms:
14.3 A
120 VAC, 4 Ohms:
9.2 A
120 VAC, 8 Ohms:
5.8 A
Display & Indicators 1 x Green LED (Power)
2 x Yellow LED (Bridged Mode)
2 x Red LED (Stereo Mode)
4 x Red LED (Clip/Protect)
8 x Yellow LED (Level)
4 x Green LED (Level)
Cooling Fan (Variable Speed)
Dimensions 19.0 x 3.5 x 14.0" / 483.0 x 89.0 x 356.0 mm
Weight 21 lb / 9.5 kg
Packaging Info
Package Weight 27 lb
Box Dimensions (LxWxH) 24 x 18 x 5.5"

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