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Safety
6
Turn-On/Turn-Off Protection
At power-up,the amplifier stays in the protect mode with outputs disconnected for about
six seconds, while the power supplies charge and stabilize. While the output relays are
open, the ACL LEDs will light. When the power is turned off, the speaker loads immedi-
ately disconnect so that no thumps or pops are heard.
Auto Ramp Signal Control
Whenever a Pro 200 Series amplifier powers up or comes out of a protect mode, the
Auto Ramp circuit activates. While the speakers are disconnected, the Auto Ramp circuit
fully attenuates the signal. After the output relay closes,the signal slowly and gradually rais-
es up to its set level. The Auto Ramp Signal Control circuit has some important advan-
tages over the conventional instant-on circuits:
1. If a signal is present during power-up or when coming out of a protect mode, the speak-
ers 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.
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