About 10 months ago bought an HK AVR435 receiver to drive the 2 Lsi15s and Lsic. The sales person said the HK would do a good job. Wrong!! First the HK is 8 ohm impedance and is only rated for 80 watts per channel. Anyway had very raspy treble when playing singers like Celine Dion. After days of reseach and thanks to this forum I just ordered three Outlaw 2200 mono blocks to fix the problem. Won't know until I get them hooked up if I have damaged the tweeters or not. Do bad I did not have the time for the research when I bought them.