I am getting a strange sound from my speakers when I power down my system. I shut everything down (amp, preamp and source) and about 15-20 seconds after that, a sound starts high in pitch and slowly drops in pitch (kind of like a bomb falling from the sky in cartoons) until it stops about 15-20 seconds later. It happens every time I power down. I have no other strange sounds or problems at any time during power up or during listening.
The sound does bother me but not enough to spend a lot of money to fix it.
I do follow the same power up / power down procedure as you described. Actually my Panamax surge suppressor does it automatically for me. It has timed outlets for amps and such.
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