Speaking of leaving your amps on or off:
From my own experience and several other A'goners, some Class D amps take a good 2 days of being on before they sound their best. If you listen to them in a store or turn them off while you are away keep this in mind. In my case I use IcePower 250 ASP amps which I know have this issue. You don't have to play music, just keep them on.
Best,
E