QSC CX254 Four-Channel Amplifier 170 Watts/Ch @ 8 ohms 250 Watts/Ch @ 4 ohms


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Dale #:QSC-CX254

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  • The CX404 gives you four 170W (8 Ohm) channels in only two rack spaces-without compromising on power. Equipped with our exclusive 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.

    With PowerLight technology, CX amplifiers take your sound to a whole new level. Not only does it give you tighter bass and clean transparent highs, PowerLight also cuts waste heat, boosts reliability and gets rid of unwanted noise and hum. PowerLight is a revolutionary switching power supply technology that provides ample current to the audio power circuitry by charging the supply rails 230,000 times a second through an ultra-low impedance circuit. So unlike amplifiers that use conventional supplies, the audio signal is never starved prematurely and remains crisp and clean.


    • Compact size-all only 2 RU and 14" deep for reduced rack cost and floor space
    • Channels 1&2 and 3&4 bridgeable for maximum flexibility
    • Active Inrush Limiting eliminates AC inrush current, removing the need for expensive power sequencers
    • HD15 DataPort connector for QSControl computer control
    • 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 on non-V models, 50 Hz or 75 Hz on V models)
    • 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
    • Light weight-all models only 21 pounds (9.5 kg) for easier racking and shipping
    • 3-year warranty plus optional 3-year extended service contract
    • RoHS compliant
  • STEREO MODE, Both Channels Driven
    8 ohms 20 Hz-20 kHz 0.05% THD170W
    4 ohms 20 Hz-20 kHz 0.05% THD250W
    2 ohms 1 kHz 1% THD450W
    16 ohms 20 Hz-20 kHz 0.1% THD340W
    8 ohms 20 Hz-20 kHz 0.1% THD500W
    4 ohms 1 kHz 1% THD900W
    Noise, 20Hz-20kHz<-106 dB
    Input Sensitivity1.22Vrms
    Gain (for full-rated output power)29 dB @ 8 ohms
    Input Clipping10 Vrms (+22 dB)
    Output CircuitryAB+B
    Distortion (SMPTE-IM)Less than 0.01%
    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 FactorGreater than 500 (1 kHz and below)
    Input Impedance6k ohms unbalanced, 12k ohms balanced
    CoolingVariable speed fan, rear to front airflow through tunnel heat sink
    Connectors, each channelInput: 3 position Euro-style detachable barrier block, Ch 1,2,3 & 4
    DataPort: HD-15 Connector, Ch 1+2, Ch 3+4
    Output: Six-position barrier strip with monitor connections, Ch 1+2, Ch 3+4
    Amplifier ProtectionFull short circuit, open circuit, thermal, ultrasonic, & protection. Stable into reactive or mismatched loads.
    Load ProtectionOn/off muting, DC-fault power supply protection
    IndicatorsPARALLEL INPUTS: Red LED
    BRIDGED: Yellow LED
    PWR-ON: Green LED

    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)
    ControlsControls Front: AC switch, Ch.1 and Ch.2 gain knobs
    Rear: DIP switch for Ch.1 and Ch.2: 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
    Dimensions19 (48.3 cm) rack mounting, 3.5 (8.9 cm) tall (2 rack spaces),
    14 (35.6 cm) deep (from front mounting rails)
    Weight21 lb (9.5 kg) net, 27 lbs (12.3 kg) Shipping
    Power Requirements 100, 120, 230 Vac, 50-60 Hz
    Idle current (Multiply currents by 0.5 for 230V units.)0.7A
    1/8 Power (Pink Noise)
    (typical of program material
    at maximum unclipped power)
    8 ohms - 5.8A
    4 ohms - 9.2A
    2 ohms - 14.3
    1/3 Power (Pink Noise)
    (typical of program material with severe clipping)
    8 ohms - 8.8A
    4 ohms - 14.2
    2 ohms - 21.7A
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