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Front Panel
1. Rack Mounting Ears.
Two front panel mounting holes are provided on each mounting ear.
2. Rack Handles.
Rack handles are removable by removing screws on back of rack ears.
3. Fan Outlet Grills.
PL Series amplifiers are cooled by two, rear-mounted fans. Cool air flows over the heat sinks and exhausts
through the front grills. Make sure these outlets remain clear to allow unrestricted air flow.
4. AC Power Switch/Circuit Breaker.
PL Series amplifiers have a front-panel combination AC switch and circuit breaker. (No fuses are used.) If
the switch shuts off during normal use, push it back to the “ON” position once. If it will not stay on, the
amplifier needs servicing.
5. Clip LED.
Illuminates at the clipping threshold. Continuous illumination also indicates that ACL (Active Clip
Limiting) protection circuitry is engaged.
6. Signal LED.
Illuminates to indicate that a signal (above a minimum threshold) is present at the amplifier input, and that
the signal is being amplified.
7. Protect LED.
Indicates that the channel is in Protect mode (speakers disconnected by output relay).
8. Active LED.
Indicates that AC power is connected and the amplifier is turned on.
9. Input Attenuators.
Two input attenuators adjust level for their respective amplifier channels. In Bridged Mono Mode, both
attenuators are used to control signal level and must be adjusted to the same setting.
Page 6 Crest Audio PL Series Power Amplifiers
Models PL3301, PL4601, PL6001, PL7001, PL8001, PL9001
-6
-10
-15
-30
-80
-3
-1
0dB
CH A
PROTECT
SIGNAL
CLIP
ACTIVE
CH B
PROTECT
SIGNAL
CLIP
ACTIVE
7001
PROFESSIONAL POWER AMPLIFIER
PL
-6
-10
-15
-30
-80
-3
-1
0dB
7 8 9
1
2 3 54
PL
6
Never try to hold the
circuit breaker/power
switch in the “ON”
position if it won’t stay
there itself!