Strange noise after amp's off ???

A line conditioner won't resolve this but the turn-off noise is a non-issue. Switching off power at the conditioner isn't any different than at the amp, but the electronics should be left always on anyway. Lots of threads on this subject are available in the forum archives. A PS Audio unit might exhibit a slow decay shutdown, but I dunno that for a fact & beside that they are expensive & inefficient.

Have you looked to see if there's anybody in there? Safety first!

Sincerely, I remain

Hi. I have a Plinius 8200, which is very similiar. Mine does the same thing. I wouldn't worry about it. Most of the time, I just leave my amp on; it has a stand-by mode and a mute switch, so not much signal is going to the speakers. Have you thought of doing that? I only turn it off when I'll be out of town or if electrical storms are expected in the area (then I also unplug it).

Hope that helps,

Dan

two theories here:

• you’re experiencing “dieseling” that can be corrected with fuel injectors kept very clean;

• when you turn off your system, the sounds from the elevator can once again be heard (see, e.g., nanci griffith, “love at the five and dime.”)

-cfb

My amp has a delayed shut off. I hear a soft sound like that first in the right channel, then the left. For my amp it is normal.