Your not going to leave your McCormacks powered up all the time unless the rest of your associated is gear is left on standby as well, that would be a bit self defeating. You can get a good sense of how much time it takes for the McCormacks to sound their best including your other gear. So I would try and power them up for that period of time prior to a listening session.
Do you leave your McCormack amps powered on 24/7?
I was told that it would be better to leave the amps powered on 24/7 than powering on/off when using it. On my DNA HT1 dlx, there is a standby mode and the amp doesn't get really warm when left on. My DNA1 dlx doesn't have a standby mode and stays pretty warm, not hot but in the middle. What is the reasoning behind leaving it on all the time? Is it really better to leave it on or is it a waste of electricity? Responses are much appreciated.