You have 6 12" woofers and still want more bass? Sounds like you did something wrong. I'd go over the tuning once more to make sure you're not cancelling out bass with the various knobs on your amps, HU, & whatever processors you do have.6 Fi SSD 12 and 2 IA 40.1
lulz.Btw, the subs are in a sealed box about 1 cu.ft. each. The bass is loud but I want it to be "chest-squeezing" in nature, not more of pounding, if you know what I mean.