Upgrading audio system

[Ben]

Hey all

Looking at upgrading the audio system in my au2 2001 xr8. Was originally fitted with the premium sound but I added a extra amp and 12 inch sub back in 04 from my old XD but its past it used by date now. Have a decent pioneer headunit I will leave in for now.

So my main questions relate to the front door speakers I understand they are 5x7's the same as the rear. I plan on making or buying some adapters to fit some 6-6.5 inch speakers but are there are factors to consider with room to clear the window slides or anything else behind the speaker.

Also I plan to change the tweeters and I would like to run them off an amp and I understand the original wiring for the tweeters taps into the front speakers is anyone able to confirm.

Cheers

Ben