sq = install #1
think about your set up
then mat the car with deader
then start with a good #1 alt then #2a good battery #3 caps on the battery so you can not hit the + #4 0g wire with an fuse under 18" form the battery #5 0gto a block so you can get 4g out fuse with in 18" of the block 4g wire to amps then run your speaker wire to the speakers think and play with the speaker spot
your wires need to be fastend no more then 6" apart thew out the car

 

Kinda freaky what you just said :P your not missing one thing i havent done.

 

thats fine now ask yourself what do I really want compete in SQ or SPL you cand have a kick *** system that sound fantastic and still burp 150's ...
it could be a matter of changing your port lenght if you are using areo ports get an extra pair with longer pipe or make a sleeve for your sloted to change the tuning .have fun with it .

 

my box is tuned at 28hz 3" port x2 for each sub.