Posted May 6, 200718 yr I am hoping some one can help me design a ported box for a single 12" QI am going to run it off of a DLS A6, 1200 watts rms x 1 @ 1 ohmthe DLS amp only has a subsonic filter fixed at 25 Hz.The dimensions that will fit in the trunk of my 2003 Nissan Altima are:33" Length x 14" Height x ? Depth is the only variablemy front stage consists of DLS UP6 (6.5" components, mid in doors and tweeters in A-pillars)the front stage is bi-amped and ran off of a Tru Technology B-745 ( 100 watts rms x 4)my goal is for the sub to blend well with the front stage and to sound musical and dynamic.