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2561953A
REV. A Printed 8/03
Printed in U.S.A.
Addendum To Operation Manual
Note: This addendum pertains to Section 3 - Setup
Section 5 - Advanced Features and Options
Section 9 - Service
It is important that you review this addendum
before reviewing the Operation
Manual.
Section 3
With reference to the DUAL/MONO mode switch:
Dual mode allows each amplifier channel to operate independently like a stereo amplifier.
Installation is intuitive - input Channel 1 feeds output Channel 1 and input Channel 2 feeds
output Channel 2. To put the amplifier into the Dual mode, turn it off, slide the DUAL/
MONO switch to DUAL, and properly connect the output wiring.
The MONO switch setting is the BRIDGE-MONO mode and is used to drive loads with a
total impedance of at least 4 ohms. For distributed loudspeaker systems, 140 volts (twice the
normal 70- volt output) is produced. To put the amplifier into the Bridge-Mono mode, turn it
off, and slide the DUAL/MONO switch to MONO. Both outputs will receive the signal from
Channel 1 with the output of Channel 2 inverted so it can be bridged with the Channel 1
output. Please note that there is no provision for paralleling the outputs to obtain a
single high-powered 70-volt constant voltage output.
Section 5
Federal Signal will not offer the T- 170V, TP- 170V, or PIP Modules as indicated in Section
5.3 -Options.
Section 9
For any service related issues, please contact Crown Technical Support. Return the unit to
Crown Factory Service, or to a Crown authorized service center if repairs need to be made.