My tale involves my SL600's, not the SL6. I found them to be a bit bright, even with my Quicksilver Mono Amps. String tone was always just a tad thin. I also somehow managed to kill two tweeters. Luckily, my dealer was able to install replacements each time. As a side note, one of the speakers fell to the floor, one day. Did I drop it? Or did a Southern California earthquake knock it off its stand? The fall bent one of the speakers' corners, but the thing still worked fine.
Yeah, one more installment in my ongoing saga of stereo woe.