Crest Audio CA4 - User Manual

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Product Description

The Crest Audio CA4 professional power amplifier is designed

to achieve unsurpassed sonic performance and long-term reliabil-

ity—even when operating under extreme stress—in touring or

fixed installation applications.

Absolute sonic accuracy is the hallmark of every Crest amplifier.

Bass is solid and defined to the limits of audibility, with ample

current reserves delivered by an “over-engineered” power supply

and advanced Class AB output circuit design. Wide-bandwidth

output devices assure detailed, transparent high frequency

response. And, thanks to Crest’s exclusive IGM circuit, the CA4

will drive 2Ω loads

safely without compromise in performance.

Construction and Quality Control

The CA4 is built exclusively in Crest’s own USA manufacturing

facility, with internal components selected for premium quality

and proven durability. Each modular subassembly is pre-tested,

and the assembled CA4 receives a rigorous “hot room” burn-in

before thorough final checkout on precision test equipment.

CA4 Features

• Crest’s legendary “overbuilt” power supply

• Toroidal power transformer

• Latest generation of high-speed, wide-bandwidth output

devices

• Twin tunnel cooling with back-to-front air flow

• Dual, variable speed DC fans

• Massive, extruded aluminum heat sinks

• Balanced XLR and 1/4-inch (TRS) inputs

• 5-Way binding post outputs or Speakon™ connectors

(market dependent)

• Stereo/parallel/bridged mono mode selector switch

• Ground lift switch

•

TourClass

protection circuits:

- ACL (Active Clip Limiting) prevents speaker damage with

gentle gain reduction at clip threshold.

- IGM (Instantaneous Gain Modulation) monitors speaker

loads to detect conditions that may overstress output

devices, allowing safe operation into nominal 2Ω imped-

ances.

- AutoRamp gradually increases gain to attenuator setting

level when amplifier is turned on.

- TourClass also includes comprehensive thermal manage-

ment, and short circuit, DC voltage, turn-on/off transient,

current inrush and sub/ultrasonic input protection.

• Input sensitivity selection

• Recessed, stepped attenuators

• Front panel circuit breaker switch

• Modular construction

• Five-year warranty*

Power Specifications 8Ω Stereo 4Ω Stereo 2Ω Stereo 8Ω Bridged 4Ω Bridged

1kHz, 0.01% THD+N 250W 435W 500W 830W 1100W

20Hz-20kHz, 0.1% THD+N 245W 400W 450W 800W 900W

Figures are watts per channel, both channels driven.

4Ω Stereo CA2 CA6 CA9 CA12 CA18

1kHz, .01% THD+N 250W 600W 900W 1200W 1800W

20Hz-20kHz, 0.1% THD+N 200W 500W 800W 1100W 1700W

Power Specifications:

Other CA Series Power Amplifiers

CA4 POWER AMPLIFIER

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Crest Audio CA4 Specifications

General

Type	Power Amplifier
Signal-to-Noise Ratio	> 100 dB
Input Impedance	20 kOhms balanced, 10 kOhms unbalanced
Connectors (Input)	XLR and 1/4" TRS
Connectors (Output)	Binding posts and Speakon
Power Output (8 Ohms)	200 Watts
Power Output (4 Ohms)	300 Watts
Power (8 ohms bridged)	600 Watts
Frequency Response	20Hz - 20kHz
Input Sensitivity	1.4 V
Cooling	Convection
Dimensions	19" x 3.5" x 12" (483mm x 89mm x 305mm)