RR Copland CD speaker killer?

I am wondering if someone with some know-how would like to guess what my technical problem is. I have Aerial Model 6's. When I play the Fanfare for the Common Man from the RR Copland CD the field drum makes my speakers crackle (that's the best word to describe the sound, which seems to come from the tweeter?!). This phenomena happened while the speakers were being driven by my old 300 watt amp (McIntosh) and still my new Rowland Concentra (the 100 watt version). So is it the amp clipping or is the speaker taking in too much power to try to reproduce the drum, even from the Concentra? (I am not sure what kind of peaks it can produce). As a test I did listen to my disk with headphones, and it does not crackle. At lower levels it also does not crackle on the speakers. I am talking normal listening levels here, as well; nothing ear splitting by any means. So are the speakers wimpy or what? This is the ONLY recording (out of many "heavy duty spectacular" types)I have that can make these speakers do this...any ideas?