Same problem here - popping whenever the auto-mute circuit kicks in. When it switches modes, too long b/w tracks, even when changing presets on the tuner.

It only occurs with my rear/center amp - a Chiro C-500. The fronts, driven by an Odyssey Stratos, does not thump. I switched amps and the thump follows the chiro. Previously, I've used a Denon receiver as a pre-pro, and no thumps there. It's definitely the pre.

When I purchased thr 950, I went thru the same questions with Steve of Outlaw, and almost sent it back.

I've posted this issue on the Forum pages at audiogon.com , and one person suggested it could be related to leaky d/c.

anyway, let's keep this thread alive and find out what the issue is. I love my Chiro, and am very close to selling it. Can't handle the THUMP much longer!

- Dan