crackling noise at high volume

For clarification....Tweeters are pretty tough, so it probably is not the music volume per se that is causing the problem. Most likely it is the TOTAL signal level, including bass which never gets to the tweeter, which is causing your power amplifier to "Clip". Cliping distortion generates a lot of high frequency signal which was never part of the original music signal. Cliping kills tweeters.

Eldartford - Can clipping occur even when the amp's rated power output exceeds the max program rating of the speaker? I thought clipping occurred when the amp "ran out of power" and sent a damaging "flat top" sine wave signal to the speakers. Seems like clipping would be more likely where the amp was "underpowered" relative to the speaker it was driving. Happy to be enlighted on this point if I'm in error.

Sandman 012 - I've used Peter Gabriel's "So" CD and its next to last track (We Do What We're Told) as a helpful diagnostic for a blown tweeter. The opening has some high frequency stuff that will cause a "buzzing" distortion from a damaged tweeter. Need to get your ear in line and close to the tweeter perhaps - but if the tweeter is bad it will be noticeable at moderate sound levels. If you have this CD, worth checking...might relieve some concerns for you if the track plays on your system without breaking up.

For those worried about distortion this is quite normal...the tweeters used in most two ways will compress at high levels. 95 db SPL at the listening position is a bit much for most consumer designs. Piano is a good way to hear it becuase the piano is a percussive instrument. Thi susally does not damage the tweeters...provided you don't over do it. Many people listen to this type distortion for years without realizing it....they just think the music is too loud for their ears and do not realize it is the speaker.

Ghosthouse...You are correct that "Clipping" refers to the "clipped off" (square) tops and bottoms of the music (or sinusoidal test signal) waveform which occurs when the waveform peak voltage exceeds what the amp can put out. However, the speaker manufacturer's recommended power amp rating has nothing to do with how much power you can apply to the speaker. The manufacturer is telling you that higher power may result in damage. It would be easy to clip a 100 watt amp driving these speakers. When you do that, an unusual proportion of that power is at high frequency and gets routed to the tweeter.

Most dome-type tweeters can take some punishment, although I have succeeded in blowing out several. The ribbon tweeters such as used by Magneplanar are more fragile, which is why you never want to use a low power amp with them.

OK, Eldarrford, Thanks for the input...amp power rating greater than speaker program rating doesn't eliminate the possibility of being able to drive the amp into clipping.