Crest Audio CPX 4 Power Amplifier

Crest Audio CPX 4 Power Amplifier

The Crest Audio CPX 4 is a two-channel power amplifier.

Designed for passive loudspeakers, it supports mobile PA rigs and fixed installations. Separate stereo channels can be combined in bridged mono when a single higher-power output is required.

Gain Comparator Limiting reduces gain as clipping approaches. A rear switch enables or defeats GCL, while front LEDs show signal, limiting, thermal protection and power status.

Each channel has a switchable 100 Hz crossover and 40 Hz low-cut filter. Line-level outputs support additional amplification and separate frequency bands.

Main Features

• Stereo and bridged mono operation adapt the amplifier to two-channel or single-load systems.
• Balanced XLR/TRS inputs accept line-level mixer signals.
• Twist-lock speaker connectors secure output cables.
• Independent front attenuators set the level of each channel.
• GCL limiting helps prevent severe clipping at high signal levels.
• Short-circuit, thermal and DC protection safeguard the amplifier and its load.
• Turn-on and turn-off muting reduce switching transients.
• Temperature-controlled cooling responds to the amplifier’s thermal load.

Technical Specifications

• Channels: 2
• Amplifier Class: H
• Power, 2 Ω: 800 W per channel
• Power, 4 Ω: 1600 W per channel
• Power, 8 Ω: 1005 W per channel
• Bridge Power: 3200 W / 8 Ω; 1600 W / 4 Ω
• Power Test Conditions: 1 kHz, 1% THD, repetitive 20 ms bursts
• Minimum Load Impedance: 2 Ω per channel; 4 Ω bridged
• Frequency Response: 12–35000 Hz (+0 / -2 dB, 1 W)
• Input Sensitivity: 1.95 V RMS (rated power, 4 Ω)
• Input Impedance: 10 kΩ, balanced
• Voltage Gain: 32 dB (×40)
• Signal-to-Noise Ratio: >88 dB (A-weighted, rated power, 8 Ω)
• Damping Factor: >400:1 (8 Ω, 20–2000 Hz)
• Maximum Channel Voltage: 97 V RMS
• Inputs: 2 × XLR / 6.3 mm TRS
• Signal Outputs: 2 × 6.3 mm High Out
• Speaker Outputs: 2 × 4-pin twist-lock connectors; bridge via channel A
• Crossover: 100 Hz, 24 dB/oct., Linkwitz-Riley
• Low-Cut Filter: 40 Hz, 12 dB/oct.
• Operating Modes: stereo, bridged mono
• Cooling: 2 temperature-controlled fans
• AC Power: selectable 115 V or 220–240 V, 50/60 Hz; IEC
• Dimensions (H × W × D): 89 × 483 × 413 mm
• Net Weight: 19.5 kg

What’s Included

• Crest Audio CPX 4 power amplifier, 1 unit
• Region-appropriate mains power cord

Who Is It For

For passive PA loudspeakers and subwoofers in live sound or installed systems. Match total loudspeaker impedance to the selected operating mode; the listed power figures use the manufacturer’s burst measurement conditions.

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Contact us: info@stageiq.lt or +370 636 55536.