After years of reliable performance by my Crown Macro Reference power amp, I suspect something may be wrong with it. There's been a turn-on pop through the speakers for some time now and a couple times lately the circuit breaker (20 amp) has tripped on turn-on. Although once on the amp performs as well as it ever did, this is making me feel uneasy. It should go in for maintenance, and I don't believe it's anything serious - probably just a change to the turn-on circuit. Even so, I'm thinking about another amp. The QSC PLX series has a lot of appeal to me right now. I need power! Cheap power. But before I take the plunge, I'd like to ask anyone own owns a QSC PLX series amp if: a.) Are there any turn-on/off thumps? b.) Is there any hum through the speakers? c.) How loud are the fans? The amp will be sitting within 4' of my chair. Have you replaced the fans? d.) What do you use for input and output connectors? e.) What is your general opinion of QSX PLX amps for home use? Thanks!