Car Audio works in a unique way as space is small and also location of where we are in the car.
If you own and driven by your staff in 5 or 7 series and spend 90% of your time at the rear then, you should put lots of efforts to the rear.
When you at the driver seat most of the time, then you need to focus on your front speakers. Setup is most important as a good speakers can produce cheap quality sound if installation is wrong. What we want is to have HIFI audio range.
My suggestions are;
Front
- 6.5" Mid Bass with Pioneer Premier TS-C720PRS
- 4" Mid RMS 80watts (Normally a component set - Alpine SPX-107R)
- Power it with Alpine MRP-F450 (2 chn to MB and 2 chn to SPX-107R)
Rear
- 6.5" MB Quart EKA 116
- 10" Sub MTX MXS1004
- MTX TA4252 - to power your EKA
- MTX TA7402 - to power your MXS104
You also need two crossover
Soundstream MTUBE-8
On budget..
Get the followings
Front
MB Quart RCE-213
Clarion SRV303 - Place under your front passenger seat
Rear
MB Quart DSF 216
Hope it help...
More SIFU out there... I am not a SIFU just on the same project as yours