Sound not up to snuff yet

brutusvk

I had all my stereo stuff installed in the Z (and my wife's GTI). I am not happy with the sound yet. It does not seem to blend right in either car, especially the singers voices. They have Alpine 927hd HUs, alpine type r 6.75 components. The Z has a JL audio 2 ch amp 75x2 at 4 ohm and a 600 x 1 powering 2 10" W3s in a stealthbox. The GTI has a 5 ch JL amp ading 2 6.75" coaxials in the back doors and a single 10 in the hatch. I really loved my old 505 HU. This is a really complicated stereo with the parametric Eq and time correction. Looking for solutions. In the Z I was considering adding rear speakers somehow and adding the Alpine PXA-H800 processor and remote then having it professionally tuned. I wod do the same wiyh the VW with processor and tuning. It makes me miss my truck. I never realized how nice the stereo was! These are our dream cars except the stereos aren't working out so far. Fixable? Opinions?

Thanks!