well, i would have agreed with ecsrun until this past week. I have a pair of 800D, running them with a 200w Rotel amp, was playing them rather loudly but not crazy loud, with choir music, and blew a tweeter. High odds the amp clipped and that blew the tweeter. But since then I've been asking around and plenty of other folks have blown the diamond tweeter with what you would think would be plenty powerful amps, including the Mac 501 mono. I guess if you never play loud, then don't worry, but these B&W speakers sound good loud..too tempting to crank it.