Why do i hear a thud when i shut down the system?

HI, System--audio researh classic 60 and preamp sp15,triangle celius speaker and two vandersteen sub woofers. THANKS.

maxhammer412-21-2011 12:47am

amthanh Details Discussions Posts This discussion Message User 34 posts 12-21-2011 at 02:37am Copy Comment URL Report Comment Edit Delete As you mentioned your system has 2 sub woofers, I think the thud comes from your sub, it could happen when you turn off your system even with the amp first because the sub still connect to the pre-amp output. Try to turn off the sub first and see what's happen.
philjolet Details Discussions Posts This discussion Message User 2,306 posts 12-21-2011 at 04:04am Copy Comment URL Report Comment Edit Delete if I remember right, it is a capacitor(s) discharging
rrog Details Discussions Posts This discussion Message User 1,958 posts 12-21-2011 at 06:34am Copy Comment URL Report Comment Edit Delete I have owned Vandersteen subwoofers with an Audio Research Classic 60 and never had a turn off thump. Amthanh, Vandersteen subwoofers do not connect to the preamp out. They connect to the outputs on the amplifier.