Alrite. so i'm eventually gonna upgrade from my two ssd 12's to either 2 Fi BL 15's or 2 DC level 4's, just one 15 for now though until i get my electrical up to par. they'll be powered each by there own AQ 1200d. i'm very familiar with Fi's subs but never tried DC, heard great things though. should i try out the Level 4 or just stick with the BL. if you think the DC's are any better then i'll go with those just for the fact of trying out a new woofer.