Levinson turn-on thump... normal??


My dealer let me borrow one of his Levinson 431's (I am ampless at the momeny - looong story) to play with for the weekend.

I noticed that when I take it out of stand-by there is a horrible turn-on thump that comes through the aerials. This happens even when there are no single ended connectors attached (ie no input thumps which could be coming from my Unidisk pre-amp). It's really unpleasant and I'm afraid it's going to damage the 10T's. Is this normal with Levinson gear? I certainly didn't expect it.

I am using a single pair of speaker terminals which are firmly snugged down under the binding posts.

Another thing I noticed was that after the thump the woofer stayed in the "out" position. Not completely pushed out - but further out than it's typical "resting" position (amp off). It seems to only happen on one of the Aerials. I switched to the other channel of the Levinson and it still did it. Any ideas? Is it possible that the resting state is not the "neutral" position of the voice-coil?

Other than those two oddities I am in love with this thing. It really creates a 3 dimensional sound and everything just sounds "right". Bass response is absolutely stunning.

Thanks in advance.
jim_swantko
I've owned several Levinson amps (23, 27.5, 335) and none
of them thumped at power on. Sounds like something else
is going on. I'd check with the dealer and see if he can
suggest ideas. As an addendum, I think Levinson amps are
terrific.
Dear Jim: No, it is not normal. It looks like exist a severe off-set at the Levinson amp, this means that is out of specs/design and needs to be fixed.

Regards and enjoy the music.
Raul.
Sounds defective. Levinson doesn`t design in thumps. They`re frowned on in this price range.