Should a CDP be left on 24/7 or shut off & on?

It may depend on what equipment you have.

I find that the Audio Aero Capitol II does need warm up time.

Isn't the Capitol always, if you don't shut it off from the back, on all the time. My AA Prima is. It is designed to always be on, and the display remains off. Keeps those little tubes toasty. I cannot imagine having any cdp long enough for the display to burn out from being left on.

If solid state, I'd leave it on all the time, unless I was listening to analog, in which case it should be turned off. Certainly doesn't hurt it. With tubes, I prefer to leave it on all the time as well (with the caveat about analog), though it does eventually wear out the glowing bottles. To my ears, digital equipment sounds its best when it's been on a few days at least.

Isn't that a thought?

I leave all my gear on fulltime and turn the dac and cd transport's display's off.

The Capitole is on all the time unless you turn off the switch in the back. I have a friend who has been concerned with lightning strikes, so he turns off his DarTZeel and Capitole II. It's awful. I ask him to put the system on in the morning if I'm coming over at night.

It simply doesn't fill out without being on.

Those players with a tube front end benefit from being on 24/7. But if your not going to play for extented times then it's a good idea to turn them off. This will prolong the life of the tubes. I haven't heard of anyone leaving units with out a tubed front end on 24/7.....