JBL CSMA 1120 User Manual

CSMA 180
CSMA 1120
CSMA 240
CSMA 280
CSMA 2120
Commercial Series
Mixer-Amplifier
Operation Manual
CSMA Mixer-Amplifiers
CSMA Commercial Series

JBL CSMA 1120 Specifications

General

Frequency Response	20 Hz - 20 kHz
THD	< 0.5%
Input Impedance (Line)	20 kOhms
Phantom Power	27V DC
Power Output	120W

Summary

Important Safety Information

General Safety Precautions

Explains safety symbols (caution, warning) and general precautions for electrical products.

Electrical Safety and Wiring

Details power cord connection, grounding, and wire color coding for safe electrical hookup.

Operational Warnings

Advises against exposing equipment to liquids, heat, and recommends precautions during storms.

Safety and Compliance Information

UK Mains Plug Warning

Electromagnetic Compatibility

Magnetic Field Considerations

Front Panel Controls and Indicators

Input and Output Controls

Describes the function of input level, output volume, and tone controls on the front panel.

Power and Status Indicators

Rear Panel Controls - Four Channel

Power and Output Connectors

Details the AC power inlet and amplifier output connectors for four-channel models.

Input and Control Connectors

Describes mic/line inputs, RCA inputs, priority input, and VOX adjustment.

Switches and Remote Control

Rear Panel Connectors - Eight Channel

Power and Amplifier Outputs

Details AC power inlet and amplifier output connectors for eight-channel models.

Remote Control and Dip Switches

Explains the RJ45 remote control connector and dip switch functions for routing and operation.

Auxiliary Outputs

Rear Panel Input Connectivity

Mic/Line and RCA Inputs

Priority Inputs and Selection

VOX Adjustment

Setup and Installation

Installation Options

Rack Mounting - Two Half-Rack Units

Rack Mounting - Single Half-Rack Unit

Rack Mounting - Full-Rack Unit

Cooling and Input Connectivity

Input Wiring and Connectors

Output Wiring and Speaker Connection

High Impedance Output Wiring

Wiring Your Audio System

Input Connections

Output Connections

Connecting to AC Mains

Protecting Your Speakers

Amplifier Startup Procedure

Operation Precautions

General Operational Safety

Essential safety precautions for amplifier operation, including wiring and tampering.

Performance Monitoring and Protection

Guidance on monitoring clip LEDs, operating load impedance, and protection features.

Input Routing Configuration

Hi-Z Switch Functionality

Phantom Power and VOX

Priority Muting Operation

Remote Volume Control

Troubleshooting Common Issues

No Power or Low Sound

Lists reasons and solutions for the amplifier not powering on or having low audio output.

Distorted Sound Issues

Identifies causes and remedies for distorted audio, such as high input levels or incorrect settings.

Target Performance Specifications

Output Power and Input Sensitivity

Frequency Response and Signal-to-Noise Ratio