Y'know, if you are concerned about power usage, its really a good idea to turn the stuff off when you are not using it.
I've been interested in solar power for a long time. I was shocked (hah! pun intended) to find out that the length of time it is on often plays a bigger role than how much power it draws.
It is a fact with audio that the hotter stuff often sounds better, as heat is being traded for lower distortion. So if you base a system entirely on heat generation, be prepared that the results may not be aligned with 'best sound for the money'.
