Crown CH4 Instruction Manual download pdf (Page 5)

page 5

CH and CL Series Power Amplifiers

Operation Manual

1 Welcome

Congratulations on your purchase of a Crown

CH or CL Series commercial power amplifier.

The CH and CL Series is a complete family of

amplifiers with a wide range of power output

capabilities and output configurations.

CH Series amplifiers can directly drive “con-

stant voltage” lines, so you can avoid the

expense of adding step-up transformers for

distributed loudspeaker systems. CL Series

amplifiers offer low-impedance compatibility

for applications where high-power, low-imped-

ance loads are the primary requirement.

All CH and CL Series amplifiers feature

Crown’s exclusive SST (System Solutions

Topologies) expansion system. The SST expan-

sion system makes it easy to tailor your ampli-

fier to a specific application or to add future

technology as it develops (see Section 4.3.2 for

descriptions of available SSTs).

Modern power amplifiers are sophisticated

pieces of engineering capable of producing

extremely high power levels. They must be

treated with respect and correctly installed if

they are to provide the many years of reliable

service for which they were designed.

In addition, CH and CL Series amplifiers

include a number of features which require

some explanation before they can be used to

their maximum advantage.

Please take the time to study this manual so

that you can obtain the best possible service

from your amplifier.

1.1 Features

• The CH and CL Series amplifiers are

designed specially for fixed installation,

and include the following features:

• CH Series provides for both low imped-

ance and high impedance loads, with the

choice of 4/8 ohm or 70V operation for

each channel. The output mode of each

channel can be set independently, allowing

unique or mismatched loads to be driven

by each channel.

• CH Series includes a 70-Hz high-pass fil-

ter for each channel (when used in 70V

mode) providing necessary low-frequency

roll-off to eliminate saturation of constant

voltage step-down transformers typically

used in 70V distributed systems.

• CL Series includes high power 2-ohm

operation, for jobs where low impedance is

the only requirement.

• A red five-way Fault LED for each channel

blinks during amplifier power-up, and

upon the following fault conditions: exces-

sive heatsink temperature; transformer

thermal protection; short at amplifier out-

put; output stage non-operational.

• An RJ11 connector allows external circuits

to monitor the status of the Fault circuit.

• Detented level controls are located on the

back panel for security, and allow for accu-

rate level settings.

• Barrier strip output connectors allow for

quick easy connection regardless of the

load, and accept up to 10 AWG crimp-on

terminal forks.

• SST modules provide flexible input

options, such as onboard crossover con-

figurations.

• Stereo/Bridge switch allows conversion

from Stereo mode to Bridge mode for

higher-powered single-channel operation.

• Advanced protection circuitry guards

against: shorted outputs, open circuits,

DC, mismatched loads, general overheat-

ing, high frequency overloads and internal

faults.

• Three Year, No-Fault, Fully-Transferable

Warranty completely protects your invest-

ment and guarantees its specifications.

1.2 How to Use This Manual

This manual provides you with the necessary

information to safely and correctly setup and

operate your amplifier. It does not cover every

aspect of installation, setup or operation that

might occur under every condition. For addi-

tional information, please consult Crown’s

Amplifier Application Guide (available online at

www.crownaudio.com), Crown Technical Sup-

port, your system installer or retailer.

We strongly recommend you read all instruc-

tions, warnings and cautions contained in this

manual. Also, for your protection, please send

in your warranty registration card today. And

save your bill of sale — it’s your official proof

of purchase.

Output Power

Output Power at 1 kHz at rated THD; Stereo mode, per channel with both channels driven.

STEREO MODE BRIDGE MODE

2 Ohms 4 Ohms 8 Ohms 70V 4 Ohms 8 Ohms 140V

CH1 450W 275W 300W 900W 600W

CH2 660W 400W 600W 1320W 1200W

CH4 1400W 1200W 600W 1200W 2400W 2400W

CL1 560W 450W 275W 1100W 900W

CL2 975W 660W 400W 1950W 1320W

CL4 1800W* 1200W 600W 3600W* 2400W

* ≥ 200VAC Line Voltage

2800W

Output Power

Output Power at 1 kHz at rated THD; Stereo mode, per channel with both channels driven.

STEREO MODE

BRIDGE MODE

1 2 3 4 5 6 7 8 9 10 ... 43 44

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Crown CH4 Instruction Manual Page 5

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