p.14
Modes
4
Mode Selection
The rear panel Mode Select Switch determines whether the amplifier is in
stereo,parallel or bridged mono mode.Do not operate the Mode Select
Switch with the amplifier on.See the next chapter on Operation for proper
wiring in each mode.
Stereo
For stereo (dual channel) operation,turn the amplifier off and set the Mode
Select Switch to the stereo position.In this mode,both channels operate inde-
pendently of each other,with the input attenuators controlling each channel’s
level. Thus,a signal at Channel A’s input produces an amplified signal at Channel
A’s output,and the same for Channel B.
Parallel
For parallel (dual-channel/single input) operation,turn the amplifier off and set
the Mode Select Switch to the parallel position;both amplifier channels will
now be driven by the signal at Channel A’s input. No jumper wires are needed.
Output connections are the same as in the stereo mode. In the parallel mode,
only Channel A’s input is active;Channel B’s input is not in the circuit.Both
attenuators remain active,permitting different levels for each channel.Power
and other performance specifications are the same as in the stereo mode.
Bridged Mono
For Bridged (single channel/single input) operation,turn the amplifier off and
set the Mode Select Switch to the Bridge position. This Mode straps both
amplifier channels together,making a very powerful single channel.One channel
“pushes” and the other “pulls” equally,effectively quadrupling the power of
either channel alone.As in Parallel mode,signal is connected to Channel A. The
nature of Bridged mode requires that both attenuators be set at the same
level,preferably at 0dB attenuation.The speakers are connected only to the
designated “+” output terminals. Use extreme caution when operating in the
bridged mode,as potentially lethal voltage may be present at the output termi-
nals.
Unlike the stereo and parallel modes,in which one side of each output is
grounded,both sides are hot in bridged mono mode. Channel A’s side is the
same polarity as the input.Never ground either side of the speaker cable when
the amplifier is in bridged mono mode;both sides are “hot.” If an output patch
panel is used,all connections must be isolated from each other and from the
panel.
Constant Voltage
CKi-V and CKi-X Series amplifiers are designed for use with distributed or
constant voltage systems. These amplifiers can also be wired for Bridged Mono
mode operation,however,bridging these models is usually undesirable,as the
output will be approximately 140V (CKi-V) or 200V (CKi-X) There are,how-
ever,specific applications for this configuration.Contact Crest Audio Customer
Service for more information if required.
See – Appendix B for information on recommended distributed line imped-
ance.
Connecting amplifier
outputs to oscillo-
scopes or other test
equipment while the
amplifier is in bridged
mode may damage both
the amplifier and test
equipment!
a
Regardless of operating
mode, NEVER con-
nect amplifier outputs
directly together!
a
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