PLEASE HELP ME DESIGN A T-LINE ENCLOSURE

[Hansom Raj Sarwan]

hi guys.. i currently got 2 12" T3 Audio T600 subs

sub is rated 600rms, has a QTS: 0.54 and the fs is 35hz

built an enclosure for them (slot port) box before displacement was 3.4cuft and after sub and port displacement the internal volume was 2.75cuft. and sounded way better than the manufacturer specs

a friend suggested that i try the T-line enclosure and after researching im confuse about how to really properly design one

so hoping someone could do a step by step on how to design a box for atleast 1 or for the 2 subs.

all help is greatly appreciated..

as for space

14.5" (height) by 22" (depth) by 38" (length)

depth could be bigger if necessary

thanks