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

uru975 Details Discussions Posts This discussion Message User 684 posts 12-21-2011 at 01:43am Copy Comment URL Report Comment Edit Delete If you turnoff the preamp before the amp, that could be the cause. Generally you turn on source, preamp(s) amp and turn off amp, preamp(s), source.