I have 2 Klipsch R-28F's hooked up to an Onkyo TX-NR838 receiver. The other day I turned the volume up to 92 for the first time and when I did both of the tweeters on the towers cut out. I turned the volume down and the one came back on, but the other did not. I tried switching the speakers to see if it was my receiver, but that wasn't the case. I was wondering if anyone had any idea what it could be? Thanks, Matt