The speakers in the drivers door of my S3 sound shockingly bad from time to time, mainly when the temperature in the car is quite low, They sound like one or the other has blown, kind of like the speaker is full of rice if that makes sence? These speakers are quite pricey from Audi and as im unsure which one it is ( mid or tweeter ) i dont realy want to pay out the around £100 to get them both, Does anybody have any they have removed i could try/buy? or is there an aftermarket option ? I am sure i read somewhere that the Bose speakers are a diffrent impeadene? to a normal automotive speaker so no straight forward swap with an aftermarket set up is possible??