Rear Panel See Appendix E for information specific to model CPA1800.
10. Output Connectors (Two versions, market dependent)
CPA Series amplifiers are supplied with either 5-way Binding Posts or Speakon connectors. Connection to
the binding posts can be made with bare wire, banana plugs, or spade lug terminations. Make connections to
both the Channel A and Channel B terminals for Stereo or Parallel Mode, or a single connection across the
red (“hot”) terminals only of Channels A and B for Bridged Mono Mode. Using Speakon-type speaker
cables, make connections to both the Channel A and Channel B connectors for Stereo or Parallel Mode, or
to the Bridged mode connector for Bridged Mono Mode. See Appendix D and the section on Mode
Selection for more information. NOTE: on the 5-way Output Binding Post version of the CPA1800, two
pairs of 5-way binding posts are provided for each channel, so that paralleling of speakers is possible.
11. Mode Selection Switch.
This recessed, three-position switch configures the amplifier for Stereo, Parallel or Bridged Mono Mode
operation. Amplifiers are factory-configured for Stereo Mode. See Appendix D and the section on Mode
Selection for more information.
12. Signal Ground Lift Switch.
The recessed signal ground lift switch (factory-set to the ‘ground’ [bottom] position) electrically connects signal
ground to the chassis/AC ground. The top position lifts the amplifier’s signal ground. In a properly designed
system (for safety purposes and to minimize noise), amplifiers should be connected to ground through the AC
line cord. Also, whenever possible, the signal source equipment should share the same AC ground as the ampli-
fier. In some cases this may not be possible, and a ground loop results. If this happens, the first step is to move
the ground lift switch to the top (‘lift’) position. In this position, the signal ground is lifted and completely iso-
lated from the chassis/AC ground. Do not change the switch to the ‘lift’ position if the amplifier and the signal
source equipment are on the same AC ground. Should the ground loop problem persist after the ground lift
Crest Audio CPA Series Power Amplifiers Page 7
Models CPA400, CPA600, CPA900, CPA1200, CPA1800
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Never connect a “hot” (red) output to ground
or to another “hot” (red) output!
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