I think I may have a ground loop problem. I recently got a Krell Kav 250a and 250p amp and preamp. When I turn on the 2-channel amp, there is a thump sent through my speakers for a second. What do you think will cause this thump. I had previously had an h/k pa5800 amp and Outlaw Mblocks hooked up with no problems. Is it a ground loop problem? I had heard of others with a similar problem but I don not recall the solution. Any recommendations appreciated. Thanks.