i ended up doing the 6x9 conversion by accident. I was on crutchfield looking for speakers, and it says 4" for the rear deck. I bought some, and they looked too small (I didnt see the tweeter until later).. So I took the 4" back and bought 6X9's. After I noticed the 6x9 4 ways I bought would not fit, I took the backing off the cover and found the tweeter. I took the tweeter out, and tried fitting the 6x9 back in... With a couple of mods to the housing, the 6x9's fit, so I didnt have to buy the adapter kit that I saw referenced here.
But I need to know how to wire these puppies up. I just bought a Pioneer DEH-P7800MP so I am waitiong for that as well. I'll be a few days without a radio anyway, so if someone could help me with the wiring, I would greatly appreciate it. Please tell me I dont need to re-wire the car with an aftermarket amp. I am running out of cash, and I fear the bimmer is gonna need some repairs at the next inspection (this month).
Also - does anyone use that pre-amp filter from crutchfield when installing an aftermarket HU or is that thing worthless?