Marshall Juers

I have 2 hds312 subs in 4.25 cubes net tuned 32 htz and subs play real low tried 5 cubes didn't like sound but 4.25 is sweet spot in my book

for starters 2002 ford mustang gt double din jvc Big 3 upgrade 250 amp alternator running hifonics brx 2400.1 with 640.4 both brx changed up build was going to run 1 fi bl 12 dual 1 already ordered and on the way but ran into a fi btl 18dual 2 my game plan is to remove back seat and build sub enclose there web site says 5 to 8 cubes tuned 32 htz got just barely enough room for 7 cubic foot box with amps in trunk lol! Is it possible to get go low end with 5 cubes trying to open a little area other wise the 18 is 3 inches from my head in case I didn't say 18 is sub I will use also do have xs battery coming also I guess im asking for help to design size of box and port size and length my area size I can get 40 wide but don't wanna do 22x22 high and deep ant sugguestions please help

thanks everybody for the help

can someone tell me what basket option yes or no means in recone section got everything else figured out

former says btl 18 dual 1 xmax new and rk I understand what dual 1 and xmax are options but what does new stand for and rk

is it cost effective to recone it

is that ufo model considered newer single stack or under something different

just bought a fi audio 18 inch sub guy told me me btl but not sure I wanna get a recone kit for it but not sure which one it has single layer looks to be split magnet I looked at images on google I think its ufo btl series is their still recons available for it

I used cut sheets to design my box in profile pic

reading fi audio web site