Crest Audio CC 5500, Owner'S Manual

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turn-on/turn-off protection
At power-up, the amplifier stays in the protect mode, with outputs disconnected, for
approximately six seconds while the power supplies charge and stabilize. While the output
relays are open, the ACL LEDs light. When power is removed, the speaker loads immediately
disconnect so that no thumps or pops are heard.
AUTORAMP
™
signal control
Whenever a CC Series amplifier powers up or comes out of a protect mode, the AUTORAMP
circuit activates. While the speakers are disconnected, the AUTORAMP circuit fully attenuates
the signal. After the output relay closes, the signal slowly and gradually raises up to its set level.
The AUTORAMP Signal Control circuit has some important advantages over conventional
instant-on circuits:
1. If a signal is present during power-up (or when coming out of protect), the speakers are
spared a sudden, potentially damaging burst of audio power.
2. Because the gain is reduced until after the output relay closes, no arcing occurs at the
contacts, thereby extending their useful life.
p.
11
protection features
5