popping sound

I own the krell fpb200 power amplifier..when I turn it on it makes 3 slight thump sounds then a pop! When I turn it off it makes a pop sound..checked all amp connections,grounding,etc. HELP !!!
Are you using a tube pre amp?
Give Krell tech support a call. Could be a problem with the muting (soft-start) circuitry.
for now don't turn it off and keep it always running. thus you'll probably save your speakers from "nervous" and powerful popin' beast until you resolve the problem with Krell.
If you want to do it yourself you'll probably need a multi-meter, cap-tester, amp circuitry and solid knowlege of electronics.
In the meanwhile before seeking repair .Turn the pre on , wait , press mute , turn amp on.