im not having a go here at all but i cant see how that car will sound nice at all.
it may be very loud, but it must sound awful, the soundstaging will be all over the place, you will have high frequencies coming from in front of you, above, and behind you, the imaging would be all over the place with 3 6x9s in each door and 5" mids behind your head.
the kicker square subs must ruin the quality bass coming from the RE subs, because so far, all I have heard from the square subs is noise and no quality.
and surely the mixing of brands cannot help at all, the tonal qualities of each brand will be different.
im sorry if im sounding rude here, im not attacking, its just my opinion and I will be happy to have a listen one day to try and prove my self wrong.
Ad