Turn off thumps occur *usually* because you have a line level signal
processor powering down before the amp.

Some amps do not have a "soft start / stop" feature and thump/pop when
they are turned off. Pyramids are notorious for this.

Garrett

Mike Sims wrote:

My sub woofer goes *POP* when I turn my car off. The amp is brand new.
Is this dangerous, and how can I stop it?