Nothing too different with the MOMO 6.5" anymore than any other "higher-end" component system...
My suggestion would be to amplify them with 75w or higher (to each channel)
Some dynamat, and some speaker baffles would help with your mid-bass / sound quality too..and they dont cost much..
I have the C400.4 momo 4channel, powering just the front speakers (each channel to each tweeter / mid-driver) and it sounds incredible IMHO.
What the amp does, is take speaker leads directly from each tweeter or mid-driver and powers them seperatley..
This does mean you will need to run new speaker wires, but its well worth ditching the passive X-OVER to do so..
The highs are very cool (not too bright or tinny) and the mid-bass comes through excellent..
Its nice not having the passive crossover which, again IMO messes with the sound quality...
Oh, and about your subs FYI...
find a sealed box that is
.88 cubic feet for the 12" subs
Good job on the speaker install btw..
Good luck man