yes, i sold my mts preludes after replacing many of the drivers, mine also buzzed on piano music and after replacing the drivers i took apart the old ones only to find that the prelude drivers are faulty, the coating that infinity uses on the neo magnets starts peeling off with age and gets trapped between the voice coil and magnets causing the buzzing sounds that you hear, there is no way to repair them once they get like this, i replaced about 6 drivers in my towers and all of them had this same problem, although the 5.25 inch woofers are harder to detect the buzz sound as they are crossed over lower, but they also scrape or buzz, i called infinity and told them of the problem i was having and asked if there was a problem with this happening and of course the said no, they weren't going to tell me that they were faulty, i read about allot of other people that are having the same problems i was having, most of them thinking that they just lost a coil, boy if the only took apart the old driver they would be pissed to find that the magnets failed, as these speakers get older you will hear about it allot more, because IMHO the neo magnets are faulty as they deteriorate with age and peel,causing the buzzing sounds that you hear, too bad as i actually liked the sound of the speaker, what a joke i have a pair of 25 year old infinity's that have neo magnets and they are still like new, since Harmon took over infinity speakers went down hill, they really skimped out on the quality of neo mags used in the prelude.
