QSC CX254 4 channels, 170 watts/ch at 8ohms, 250 watts/ch at 4ohms, 450 watts/ch at 2ohms.

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EMI Audio
Robbinsdale, MN, United States
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About This Listing


The 4-channel CX amplifiers give you four channels in only two rack spaces, without compromising on power. Choose from three models, a direct 70 volt model and two lowimpedance versions. Each model is equipped with exclusive QSC PowerLight™ switching power supply technology to virtually eliminate noise and hum. With high-output power, versatile loading options, high-thermal capacity and unmatched reliability, the CX Series is the perfect solution to any permanently installed sound system.


  • 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 (33 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
  • 3-year warranty plus optional 3-year extended service contract
  • All CX Series amplifiers meet the European Union's, 2006 RoHS directive to restrict the use of hazardous materials used in electronic devices.
SPECIFICATIONS CX254   POWER PER CHANNEL, STEREO MODE (all channels driven) 8Ω, 20 Hz–20 kHz 0.05% THD 170 W 4Ω, 20 Hz–20 kHz 0.05% THD 250 W 2Ω, 1 kHz 1% THD 450 W 70 V, 20 Hz–20 kHz 0.05% THD - 70 V, 1 kHz 0.05% THD - 70 V, 1 kHz 1% THD -   POWER, BRIDGED MONO MODE 16Ω, 20 Hz–20 kHz 0.1% THD 340 W 8Ω, 20 Hz–20 kHz 0.1% THD 500 W 4Ω, 1 kHz 1% THD 900 W 140 V, 20 Hz–20 kHz 0.1% THD - 140 V, 1 kHz 0.05% THD - 140 V, 1 kHz 1% THD - Noise, 20 Hz–20 kHz >106 dB Input Sensitivity 1.22 V rms Maximum Voltage Gain 29 dB Input Clipping 10 V rms (+22 dBu) Output Circuitry Class AB+B Distortion (SMPTE-IM) Less than 0.01%   ALL MODELS Distortion (Typical)
20 Hz–20 kHz: 10 dB below rated power
1.0 kHz and below: full rated power
Less than 0.01% THD
Less than 0.01% THD Frequency Response (typical) 20 Hz–20 kHz, ± 0.2 dB 8 Hz–50 kHz, +0/-3 dB Damping Factor   Greater than 500 (1 kHz and below)   Input Impedance   6 kΩ unbalanced, 12 kΩ balanced   Cooling   Variable speed fan, rear to front airflow through tunnel heat sink   Connectors, each channel   Input: 3 position Euro-style detachable barrier block, channels 1, 2, 3, 4
DataPort: two HD-15 connectors—Ch 1+2, Ch 3+4
Output: Six-position barrier strip with monitor connections, Ch 1+2, Ch 3+4   Amplifier Protection   Full short circuit, open circuit, thermal, ultrasonic, & protection. Stable into reactive or mismatched loads.   Load Protection   On/off muting, DC-fault power supply protection   Indicators   CLIP/PROT: Red LED (1 per channel)
LEVEL-10 dB: Yellow LED (1 per channel)
LEVEL-20 dB: Yellow LED (1 per channel)
SIGNAL -35 dB: Green LED (1 per channel)   Controls   Controls Front: AC switch, four gain knobs
Rear: Two DIP switch gangs—channels 1 and 2; channels 3 and 4: clip limiter on/off, LF filter on/off, LF filter freq select 33 Hz or 75 Hz for non-V models; 50 Hz or 75 Hz for V models; inputs parallel or stereo; bridge mode   Dimensions   19" (48.3 cm) rack mounting, 3.5" (8.9 cm) tall (2 rack spaces),
14" (35.6 cm) deep (from front mounting rails)   Weight   21 lb (9.5 kg) net, 27 lb (12.3 kg) shipping   Power Requirements   100, 120, 230 V AC, 50–60 Hz

Product Specs

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
Number of Channels
  • 4

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