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QSC™ CX404 Power Amplifier with Four Channels at 250watts/Channel @ 8Ω

QSC™ CX404 Power Amplifier with Four Channels at 250watts/Channel @ 8&

QSC™ CX404 Power Amplifier with Four Channels at 250watts/Channel @ 8&
Model #: CX404
  • ASL Price: $1600.00
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Product Description

CX 4-Channel Series
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 low impedance versions, each 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.

Amplifier Control and Monitoring
Q-Sys Compatible
Advanced monitoring and control when used with a Q-Sys or BASIS system. Learn more
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.


  • Three models that range in power from 170 watts to 450 watts per channel
  • Compact size-all models 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 Q-Sys and QSControl computer 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 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
  • All CX Series amplifiers meet the European Union's, 2006 RoHS directive to restrict the use of hazardous materials used in electronic devices.

Free Shipping

*Free Shipping applies to UPS Ground Shipping only to the contiguous United States. Offer does not apply to items shipped to Alaska, Hawaii, or internationally. Returned products will have the cost of shipping deducted from any refund or credit. Offer may not be combined with any other offers or discounts.



  MODEL #   CX404
  STEREO MODE, (All Channels Driven)    
  8 ohms 20 Hz-20 kHz 0.05% THD   250W
  4 ohms 20 Hz-20 kHz 0.05% THD   400W*
  2 ohms 1 kHz 1% THD   not recommended

  16 ohms 20 Hz-20 kHz 0.1% THD   500W
  8 ohms 20 Hz-20 kHz 0.1% THD   800W*
  4 ohms 1 kHz 1% THD   not recommended
  Noise, 20 Hz-20 kHz   <-106 dB

Input Sensitivity @ 8 ohms   1.22Vrms
  Gain (for full-rated output power)   31 dB @ 8 ohms

Output Circuitry   AB+B
  Distortion (SMPTE-IM)   Less than 0.01%

Distortion (Typical)   20 Hz-20 kHz: 10 dB below rated power: Less than 0.01% THD 1.0 kHz and below: full rated power: Less than 0.01% THD
  Frequency Response   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   6k ohms unbalanced, 12k ohms balanced

Input Clipping   10 Vrms (+22 dB)
  Cooling:   Variable speed fan, rear to front airflow through tunnel heat sink

Connectors, each channel  

Input: 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 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
  • 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)


Controls 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

  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 lbs (12.3 kg) Shipping
  Power Requirements   100, 120, 230 Vac, 50-60 Hz



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