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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,
128x128rilands

Showing 1 response by reubent

reubent
6,939 posts
 
Rilands,

Sounds like the typical thump when using a subwoofer amplifier that has an auto-on circuit. When the amp senses a signal, it turns the amp on. I've heard this thump in many setups that have an amp that uses an auto-on circuit.

I would guess that the built-in amp in your NHTs has an auto-on circuit and you are hearing the amp turn on and "thump" the woofer.

TIC
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