My QSC2402 was rattling as loud as my speakers were playing. very annoying and not acceptable. Not a little rattle, loud rattling. I called QSC to get an RA to send back my QSC 2402. I was told that the amp is never suppose to be placed on a speaker cabinet because "the fragile components will break from the vibration". I said "I better not drive with it in my car then either huh?"(please not sarcasm) He said that(paraphrase) "the amp is not designed to be placed on a sub cabinet and to place it elsewhere." I said, "so can I send it in for repair or can you tell me how to fix it? I looked on the forum and saw the problem posted but no fix." The amp was not made for that application and the fine components will break if you use it in that application" I say "whatever, thanks, buy." So I say, QSC amps must be for home use only, and don't walk to hard next to them unless you have sturdy floors. I place the QSC in a rack with plastic washers, put stuff on it so that it is wedged tight, place it on a p[piece of foam folded over 3 times and 1 carpet sample square and I still get some rattle. I can't take that to a gig, its ridiculous. Anybody know what I can do to make my precious porcelain amp work without ridiculous amounts of rattling?