hispls 5,000+ posts
CarAudio.com Veteran
Original paper drivers were shredded, this is in my 2000 Corvette. And no, not yet, the car isn't even totally back together (door panels still off, etc). I haven't touched EQ or TA. Still messing with xovers and slopes. I will use this for a while and then decide on doing speakers in the rear quarter panel spot or doing a small sealed sub. I originally went 2 way active with a small 4 channel to keep the budget down.
For now though Ill accept the fact im not going to get sub bass out of my mids and raise the xover to 80 or 100hz with a 12db slope and go from there.
Most people that want real "full range" use 7 or 8" woofer + tweeter and really even those won't do so much below 60hz. If you want to just throw different drivers at it search around some home audio forums for "full range" or 2 way monitor type projects and see what's popular and more importantly see what people say about low extension of such drivers.
It's a real sticky wicket in that by the time you have a woofer that plays low, the very qualities that'll make it play low well make it junk for up high and vice versa. Home audio gets away with it by having a proper cabinet (typically ported) and using larger format tweeters than may be practical in a car. Supposedly there are some that do both reasonably well, but they never hold a lot of power (think 30W) and mostly you see 7 or 8" for true "full range" drivers.
Also you can simply use the fader to see if it is a phase issue with your low frequency, as has been mentioned just the acoustics of the car could be creating a null. If each side on its own is just as loud or louder than the two together, reversing phase on one may help. Running one or both tweeters out of phase is another popular trick if you have any wierd peaks, nulls or issues around crossover point.