Thanks mdrew. Warfer, you're probably right and thanks for the info. Wid mentioned to me just last night that I need more space to let my receiver breathe. I'm going to rewire my system (thanks Wid), look into this Fluke gadget, buy a new tweeter, get more space over the receiver and then decide whether or not to get the receiver checked. It would be a pain in the ass to get that receiver checked (time/logistics) and I have to weigh opportunity costs here. If I don't get it checked I risk frying another tweeter but maybe the above will solve my problem.