[DISCONTINUED] QSC CX404 4-Channel 250W Power Amplifier

The CX Series is designed to meet the specialized needs of sound contractors. Eight 2-channel models have been designed from the ground up, combining the exclusive QSC PowerLight™ technology with specific features to meet the requirements of fixed installations. 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.

QSC CX404 Features

• 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.

• CX404 4-Channel 250W Power Amplifier1
• Three Year Warranty plus optional 3-year extended service contract1

• POWER PER CHANNEL, STEREO MODE (all channels driven)
  • 8Ω, 20 Hz–20 kHz 0.05% THD: 250W
  • 4Ω, 20 Hz–20 kHz 0.05% THD: 4000W*
  • 2Ω, 1 kHz 1% THD: not recommended
• POWER, BRIDGED MONO MODE
  • 16Ω, 20 Hz–20 kHz 0.1% THD: 500W
• Noise, 20 Hz–20 kHz>105 dB
• Input Sensitivity1.22 V rms
• Maximum Voltage Gain31 dB
• Input Clipping10 V rms (+22 dBu)
• Output Circuitry ClassAB+B
• Distortion (SMPTE-IM)Less than 0.01%
• Distortion (Typical) 20 Hz–20 kHz: 10 dB below rated powerLess than 0.01% THD
• 1.0 kHz and below: full rated powerLess 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 Impedance6 kΩ unbalanced, 12 kΩ balanced
• CoolingVariable 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 ProtectionFull short circuit, open circuit, thermal, ultrasonic, & protection. Stable into reactive or mismatched loads.
• Load ProtectionOn/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
• 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 lb (12.3 kg) shipping
• Power Requirements100, 120, 230 V AC, 50–60 Hz