I would suspect the manufacturer knows what's best for their equipment.Just a thought.
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Spectron also recommends leaving their amps on.
The reason is that class D amps take much longer to run-in with their IECs and turning them off is akin to turning back the clock on the run-in period where the amp will need on/'run time to sound its best again.
The only time I turn mine off is during bad storms and if I am going to be away for more than a week during thunderstorm season. I do use a Hydra on mine in any event.
Timrhu's right: I turn the amp off for late-night listening. My pattern is to power it down, and then back up in the a.m. It's clear some think that's a bad idea, performance-wise. I can't say that I notice much of a difference, but it's usually been on for an hour or two before I do any listening.
I could turn it off only when using headphones, but figured that since I'm turning it off, I might as well leave it off for the night.
I have the Nuforce 9V3SE amps and power them down anytime I'm not using them unless I plan to use them within a very short time. I honestly can't hear much of a difference between stone cold and on for a while and personally I feel better from a green perspective not keeping the amps turned on when not being used.