Not trying to be a wise guy, but if it only takes a 1/2 hour to sound optimum, why bother leaving it on 24/7? Is there a sonic difference? If there isn't does that mean that we're all leaving our gear on to be able to 'save' a 1/2 hour? Here's the thing, I've tried both ways, and I'm hard-pressed to hear the difference. So, even though I've been at this for decades, I'm left with the old basic, rookie insecurities. Namely, is my gear good enough to hear the difference?, is my hearing? I'm curious to read more!;)