5x7... hummm
I'm not sure if I want to go with a sub or not, probably amp'ed front splits and amp'ed 6x9's for bass out back.
What do you think Jello? I'm looking to save boot space as its my reliable daily drive.
If you wanna enjoy yr sound system, definitely 6" splits in the front (+sound deadening in front door for better mid bass and lesser rattling), a 12" sub, any half decent rear speakers and a decent Head unit (pref with 3 RCA outs for future expansion). Head units are cheap now. You can even buy a decent 4 channel amp, run the front speakers off the ch 1 & 2 and bridge 3 & 4 to run the sub.
I like all things round (hmmm......), hence I'll avoid all 6x9 or 5x7 etc.
But seriously, rounded speakers produce better sound quality with less distortion.
Anyway, that's my 2 cents.
FYI, I've tried running just 6 x 9" in front door, it fits but it's lot of work and the low bass is just missing.