bassthrust
April 19th 06, 03:07 AM
I have an obscure question for you. I have two 12" subs that require
1.4 cu ft. air space each and requiring a 4" port 'x' inches long. Due
to the different curves of my trunk and the weight consideration of
using one huge MDF box, I would like to build three different chambers
(boxes). The first chamber (made of MDF front, fiberglass everywhere
else) will be the one actually holding the subs and sits against the
back seat. The chamber includes a 4" wide pvc port with length 'x' per
subwoofer's manufacturer recommendation. It's total net internal volume
is 2 cu ft. (taking into account the port volume, bracing etc). Next I
have two separate identical smaller chambers with MDF fronts and molded
fiberglass everywhere else, each with internal volume of .35 cu ft.
The two smaller chambers are located on either side of the trunk taking
advantage of the shapes of my rear quarter panel area. I connect each
of the small chambers to the larger chamber via a 4" wide pvc pipe of
whatever length is needed for each to reach the large chamber. Let's
assume the internal volume of the two smaller chambers plus the volumes
of the two connecting 4" wide pipes equals .8 cu ft. Connecting them
in this fashion results in a total net internal volume of 2.8 cu ft,
exactly what the subs need. Would connecting the three chambers this
way trick the subs into thinking that the chamber they are in is not
three separate chambers but a single large chamber with a total of 2.8
cu ft. of internal volume? Would the diameter of the connecting pipes
make or break this design? What if I had four 3" wide pipes connecting
each smaller chamber to the larger chamber, theoretically, negating any
airflow restrictions, compliance issues. Would this work? Thanks in
advance. Bassthrust
1.4 cu ft. air space each and requiring a 4" port 'x' inches long. Due
to the different curves of my trunk and the weight consideration of
using one huge MDF box, I would like to build three different chambers
(boxes). The first chamber (made of MDF front, fiberglass everywhere
else) will be the one actually holding the subs and sits against the
back seat. The chamber includes a 4" wide pvc port with length 'x' per
subwoofer's manufacturer recommendation. It's total net internal volume
is 2 cu ft. (taking into account the port volume, bracing etc). Next I
have two separate identical smaller chambers with MDF fronts and molded
fiberglass everywhere else, each with internal volume of .35 cu ft.
The two smaller chambers are located on either side of the trunk taking
advantage of the shapes of my rear quarter panel area. I connect each
of the small chambers to the larger chamber via a 4" wide pvc pipe of
whatever length is needed for each to reach the large chamber. Let's
assume the internal volume of the two smaller chambers plus the volumes
of the two connecting 4" wide pipes equals .8 cu ft. Connecting them
in this fashion results in a total net internal volume of 2.8 cu ft,
exactly what the subs need. Would connecting the three chambers this
way trick the subs into thinking that the chamber they are in is not
three separate chambers but a single large chamber with a total of 2.8
cu ft. of internal volume? Would the diameter of the connecting pipes
make or break this design? What if I had four 3" wide pipes connecting
each smaller chamber to the larger chamber, theoretically, negating any
airflow restrictions, compliance issues. Would this work? Thanks in
advance. Bassthrust