help please

[Mike Kidd Hicks]

Looking for the cabin gain in my 2005 impala. Doing my complete built.along with inclosure. The box is my first and is tuned as close as I know to around 36. List of equipment

Rf t1000 bdcp

Rf p3 12 d4 x2

Audiocontrol epicenter

Audiocontrol matrix

For now replaceing

Kicker 6x9s

Pioneer 6 1/2 components.

SSL 4.400 .

But I have been reading how cabin gain can drop your tune. If anyone knows let me know please already did the lo lo 26 htz at 139.9 with a set of massive t12d4s and n4 just to see what would happen. Love the lo Los but not meet for street beaters Lol people get real mad when u break glass at there offices. Will post pics of trunk setup when she's photo worthy and when I figure out how to add pic. Thanks

For no

[TRTC360]

I have absolutely no idea what I just read.