What's this stuff on the back of a PS Audio Outlet

They might be capacitor's (or a simple network)to shunt noise to ground from positive and neutral.

The blue things look like MOV's (Metal Oxide Varistors) They provide overvoltage protection. The black square thing looks like a capacitor, probably for noise reduction.

The blue devices are Y caps used for high frequency filtering. They are connected between line to ground and neutral to ground. The large square device is a surge suppresor connected across line to neutral.

Rich

Answer from Audio Asylum-

http://www.audioasylum.com/forums/psaudio/messages/6629.html

Never did get an answer from the email I sent directly to PS Audio...huh :)

Marty

It was Paul McGowan from PS Audio that responded that they were capacitors, but his response was rather brief. You might want to ask him at that forum what purpose they serve.