Hiend2 is close. The turn on/off thumps are caused by a rapidly climbing or decaying DC signal component being coupled to your speakers. This occures as the ciruit RC constants are charged/discharged. Most equipment is designed as to not allow this, by circuit design, or relays. Turn on your powered speakers last, if that does't work, they are likely defective.
Loud thump when I power on or off
I have some NHT VT3's hooked up to a fairly nice system. The amp is the Mc6850. These speakers have the built in power amps and come with a preamp of they're own. The thumping noise never happened on my last several pairs of speakers with my current Amp. It also seems to of gotten quite a bit worse since I hooked up a turntable a few weeks ago. It is worse when the volume is turned up more.
I don't mean to sound like an idiot but my first few ideas are as follows: Buy a line conditioner, hmm, not sure what else. Do I have a ground issue? Does anyone have any ideas. Thanks,
I don't mean to sound like an idiot but my first few ideas are as follows: Buy a line conditioner, hmm, not sure what else. Do I have a ground issue? Does anyone have any ideas. Thanks,