Obie- Make sure to check for hiss after the "global" mute has let go:

Play a DVD/CD doesn't matter. Then pause it, then listen for the hiss. Be aware that the newer 950's also might have a "active" mute for digital sources that kicks in 0.5 to 1.0 sec after you stop (or pause) a digital source.

No active mute on analog sources (even if they are A-to-D'ed and D-to-A'ed inside the 950).