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Crest Audio CA18 - User Manual

Crest Audio CA18
24 pages
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OWNER’S MANUAL
PROFESSIONAL POWER AMPLIFIERS
Professional Power Amplifier
Professional Power Amplifier
Professional Power Amplifier
Professional Power Amplifier
Professional Power Amplifier
Professional Power Amplifier

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Crest Audio CA18 Specifications

General IconGeneral
Power Output (8 Ohms Stereo)600W
Power Output (4 Ohms Stereo)900W
Power Output (8 Ohms Bridged)1800W
Signal to Noise Ratio>100dB
Connectors (Input)XLR and 1/4" TRS
Connectors (Output)Binding posts and Speakon
Frequency Response20Hz - 20kHz
Input Sensitivity1.4V
CoolingVariable speed fan
Dimensions19" x 3.5" x 17.5" (483mm x 89mm x 445mm)
Input Impedance20 kOhms balanced, 10 kOhms unbalanced

Summary

Important Precautions

Installation and Power Safety

Precautions for unpacking, power connections, grounding, voltage verification, and basic setup.

Operational Environment and Connections

Warnings regarding ventilation, heat sources, liquids, signal levels, and connection hazards.

Usage and Service Safety

Guidelines for switch operation, testing, avoiding hazards, and safe servicing access.

Introduction to CA Series

Product Overview and Design

Introduction to CA Series amplifiers, their design, and quality assurance.

Unpacking and Inspection

Handling Damaged Shipments

Procedures for notifying suppliers of damage and saving packing materials.

Installation and Mounting

Rack Mount Specifications

Details rack space requirements and mounting options for CA Series amplifiers.

Front Panel Components

Indicators and Controls

Description of Signal, Clip, Active, Protect LEDs and Input Attenuators.

Physical Features

Details Rack Mounting Ears, Optional Rack Handles, and Fan Outlet Grills.

Power Switch and Breaker

Description of the front-panel AC Power Switch/Circuit Breaker.

Rear Panel Connections

Output Connectors

Details 5-way binding posts or Speakon connectors for output connections.

Mode Selection Switch

Configures amplifier for Stereo, Parallel, or Bridged Mono Mode.

Signal Ground Lift Switch

Lifts amplifier's signal ground to prevent ground loops.

Input and Configuration Details

Input Connectors and Airflow

Balanced 1/4" (TRS) & XLR Input Connectors and Fan Inlet Ports.

Internal Configuration Options

Input XLR Polarity and Input Sensitivity adjustments.

Amplifier Operation and Connectivity

Power Requirements and Cooling

Details power needs, voltage configurations, and cooling system requirements.

Input and Output Connections

Guidance on connecting audio signals to inputs and speakers to outputs.

Mode Selection Modes

Stereo Mode Operation

Independent operation of both channels with separate level controls.

Parallel Mode Operation

Signal on Channel A outputs to both Channels A and B.

Bridged Mono Mode Operation

Combines both channels into a single, powerful monaural amplifier.

TourClass Protection Features

Active Clip Limiting (ACL)

Limits gain during clipping to protect loudspeakers from square waves.

Impedance Sensing (IGM)

Adjusts gain for safe operation into low impedance loads like 2 ohms.

AutoRamp and Thermal Protection

Gradual gain increase on power-up and output disconnect for overheating.

Fault Protection Mechanisms

Protection against short circuits, DC voltage, and subsonic frequencies.

User Precautions and Cabling

Speaker Protection Guidelines

Warnings about loudspeaker damage from excessive power, clipping, DC, or low frequencies.

Recommended Speaker Cabling

Guidance on selecting appropriate wire gauge for speaker cables to minimize power loss.

Maintenance and Service

Filter Cleaning Procedures

Periodic cleaning or replacement of rear fan intake filters.

User Responsibility and Support

Proper Operation and Wiring

User's responsibility for correct installation, wiring, and operation.

Authorized Service and Repair

All repairs must be done by qualified technicians or authorized service centers.

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