Now i have system that i'm not really happy with ... i'm looking for high quality deep sound
i have soundstream hdhu 14 HD + hki dsp
evoux 2 800.4 for front ground zero yellow + lids sx690
evoux 2 800.4 bridged for 2 svl200 in the bags
evox 400 for diamond mt075 in the grils

i thought go for front 6.5 diamond neo bridged from 800.4 and lids diamond 6x9 neo also bridged from the sec 800.4
will it be much better ??

the sec question is about the 8 in the bags , understood i'll need to buy 3th amp but i'm confused what should be the speaker choose , the 4 diamond i'll install will have ton of bass , is it right to have the 8 also midrange or must bass woofer ?
midrange will sound good towards the rear wheel ?

 

If you want deep sound, you need 10's in your bags. Plain and simple.
Your GZ fairing and Hertz 690 are also low on power currently. They need more power.
Are you running a DSP?