yes  build this box . en Yes its hits loud
in a car  ( suzuki swift)  on this moment it hits a 141 db  on dash
but  the freq is to LOW   141@ 36 hz  with the termlab sensor
any1 that can tell  how too  get a freq rise ?
thinking to make the rear chamber smaller ?
but wil do that that trick .

sorry for my my english  

i think  whe got it

next weekend we will test some things .
hope that freq wil rise to about 42 hz  .so music sound still
great but ugly loud

ps: it fun to see the kids face here when it hits  the low note`s
at BAch`s toccata

the suzuki swift is just a project for a friend of mine .
trying to get that car loud  for  dbdrag Bassrace
playing with 2    12inch groundzero  radioactive
and only 500 watt  its  already i nice  score
.
My project is something else
my ride a subaru vivio  realy small car .
wil be loaded with a  Planet audio  BB12dvc
and the 1/2  of the WO . but with the full horn .
and will get 2250   watt @ 1 ohm  
on this moment the woofer hits 145.7  vented
and i think it will be louder  in the WO