If it is a Pure class A amp like the XA30.8 or XA25, turn in off. These amps pretty much draw full power even when no signal is applied. The heat generated with class A will shorten the life of the parts inside, mostly caps, your electric bill will be noticeably higher, and will add extra heat to the room that will be a problem during warmer months. If the amp is a class A/B, Its your call, class D leave on all the time.
Pass Labs XA-25 on all the time?
My Pass Labs XA-25 stays on most of the day. It does sound its best about an hour after it turns on. I'm thinking of leaving it on all the time. Does this help or hurt the amplifier in some way. I have a PS Stellar S300 in another system that stays on all of the time. It's a class D amp so it uses very little power at idle . PS recommends leaving it on. It sounds better to me that way. Other than the power consumption, is there a downside to leaving the Pass on all the time? Thanks Larry