Always ON?

I have always turned my system off after every listening session. It seemed that the sound would improve after 20 to 30 minutes. I was told it was not my imagination. In a smaller forum, there was a two person concensus that you should leave your electronics on 24/7. My vandersteen subs dont have on off switch so they are always on. Front end: Carver pre, Hca-2 and a Music Hall 25 mod.

So Audiogon, whatdayathink?