Hi all. Any ideas if any of the 5 channel amps out there have a sleep mode where they power down on no signal? My Sony Pre doesn't have auto off and I'm forever leaving it switched on meaning the power amp is always running hot and using loads of electricity. Is there an amp that will shut itself off if it doesn't get any input for like 10 minutes? I'm not talking about remote 12v switching, just detecting signal through the inputs and switching itself down if there is none for a while?