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Protection Features
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 DDT™ LEDs light. When
power is removed, the speaker loads immediately disconnect so that no thumps or pops are heard.
Turn-On/Turn-Off Protection
Whenever a PV® 3800 amplifier powers up or comes out of a protect mode, the RAMPUP circuit activates. While
the speakers are disconnected, the RAMPUP circuit fully attenuates the signal and activates the DDT LED. After
the output relay closes, the signal slowly and gradually raises to its set level. The PWR LED will illuminate and
the DDT LED will turn off when the signal is no longer attenuated. The RAMPUP 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. This extends the contacts’ useful life.
RAMPUP™ Signal Control