ngsm13 5,000+ posts
BSEE
Those 8's are GIGANTIC.1.) Get a set of Rainbow tweeters2.) Get a head unit with a lot more procesing
3.) Get a good Active Xover, 4 band
4.) Get a good 30band EQ
5.) Get a good 4 channel amplifer or two good 2 chanel amplifiers
If it where me I would run the Assasin 8's from 50-200Hz, the Aersenals from 200-2000, and the tweeters from 2000-20000. Put all three infront of you. Assasins and 6.5's in the kick or lower door and the tweeters on the dash (to help raise sound stage).
THEN run the Ava18 sealed in the trunk from 50Hz down.
Then start messing with aiming of the tweeters. When you get the sound you like you are ready to move on.
After that is all done start to play with cross over poits and slopes. When it gets sounding good to your ears move on.
Now start EQing. Doing 20-20000Hz sweeps with a mic will tell you where your dips are and you can work them out with the mic and by ear.
Now start messing with time alignment assumeing that is a feature on your head unit.
That is a basic run down of the tuning and set up competition SQ cars go through. Ive never personally set up an SQ car for competition, but that is what Ive have helped do for daily SQ.
I'd go with the AVA18 sealed, 4cubes NET with polyfill.
nG