Me heads battered with it all I've searched & read & searched more & read more but now I'm more confused than when I started O.k, A4 b5 saloon. All I want is a relatively straight-forward speaker upgrade. I've bought front & rear adaptor rings from Here. Yes, yes I know they are supposed to be **** but I'm not set up to be making things from mdf so the rings are gonna have to do I'm afraid. I'm not so bothered about the rear, I've a pair of old Infinity Kappa 6.5's that should go in ok. I don't even want new speaker wires if I can help it and plan to just trace the audio wires from the rear plugs and use those. It's the fronts where I'm coming unstuck. I'm getting conflicting info as to what fits, I believe it's 5.25 with a depth of 55mm inc adapter, is this correct? Also I see folk running into trouble with the diaphragm rubber binding against the adaptor, so I can see speaker choice is going to be crucial!. So, anyone recommend a speaker that fits the adaptors in the front? Ive looked at These Alpine SPE-17SF but I want to make sure they fit, I'm also assuming the tweeter will fit ok in the existing hole. I've got a budget of £100 for the front. Also I've been doing a bit of research on this 'Dynamat' stuff and it appears to be nowt more than roofers flash banding and I can get that from B&Q 10m 6" wide for under a tenner so I plan on chucking some of that in the door panels. I really would appreciate a definitive answer on some known to fit speakers please lads Si.