I got my car last July (Audi S3 2001 with BOSE) and then after about a week I noticed the front passenger speaker was not working.
I took the door card off to find there was not a speaker there! After months of looking on ebay and asking here for a front boase speaker I finaly got a pair from ebay.
So I fitted one and all seemed good for about 1 - 2 months now at low volume you can here the speaker crackerling/vibrating
You cant here it so much on music or if the sound it turned up quite high but you can here it more when people are talking on the radio with music in the backround
Like on Radio 1 news becuase they backing music is quite bassy it sounds bad then
Do you think it's my speaker or possibley the bose amp I here they can cause a few problems