My friend bought a set of Logitech Z560 speakers about a month ago. About a week and a half ago, he said that the satellites were cracking. I thought it was just the music he was playing. Today, he was going through different songs and in everyone the satellites were cracking. So, I guess that he blew his Z560s that are about a month old. I does not really suprise me though, he regularly listens to them at half volume or louder with the bass at similar levels. I guess that is what you get for listening to loud music all the time.