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View Full Version : PLZ HELP for BOX DESIGN OF 6 SUBS



ronrico418
04-18-2008, 01:01 AM
max external dimension are

W 39
H 17
D 31

I am using 6 12" Crossfire BMF's and would like to do all subs up with one single slotted vent port firing back at the lower rear center (aka smd style). Plenty of power going to subs - if possible I would like to do a double baffle. If more room is needed I can fight for a lil more but I think think this should be close.

I'm aimimg for 1.5 cubes per sub
displacement of woofers is .09 each

Any help greatly appreciated Thanks in advance joey

Skip01
04-18-2008, 01:02 AM
I wouldnt do all subs up

Try either 3 up 3 forward or 4 up and 2 forward

Might get to much cancellation with all 6 firing up

DD_Dave
04-18-2008, 01:02 AM
you'll most likely run into phase problems with that many subs

ronrico418
04-18-2008, 01:10 AM
How about 4 18s up in steve meades truck. seems to work there right. If it takes 3 12s to make up 1 18 in cone area should this be okay. I've always found that the closer you mount the subs together the more they act as one increasing total output.

ronrico418
04-18-2008, 01:15 AM
Really shouldn't be a problem with all 6 subs facing up. I just talked to Shawn Fleming from Fi and he laughed. All subs up is fine he said. He would be helping me w/ enclosure as usual is not possible at the moment cuz he is working on a race truck for PINK'S ALL OUT in Gainseville Fl this weekend. So I turn to you guys and again any help is appreciated.

ronrico418
04-18-2008, 02:12 AM
This is what I have come up with

PORT 10X6 12.5"long tuned to 31hz

lil_italy773
04-18-2008, 02:17 AM
I wouldnt do all subs up

Try either 3 up 3 forward or 4 up and 2 forward

Might get to much cancellation with all 6 firing up
so tru im trying to figuer out that with the 6 15s i got goin on.
i had mad cancellation with just one 18"walled in my jimmy had to have the windows all down, then it got really loud then

lil_italy773
04-18-2008, 02:23 AM
How about 4 18s up in steve meades truck. seems to work there right. If it takes 3 12s to make up 1 18 in cone area should this be okay. I've always found that the closer you mount the subs together the more they act as one increasing total output.
his truck also has alot of cabin space for them to develop there wave pattern, but still has to roll this windows down to get loud.

i think the same thing will happen but lets hope it dont but just from what ive done it wasnt as great as i expected

Supergumby5000
04-18-2008, 02:27 AM
This is what I have come up with

PORT 10X6 12.5"long tuned to 31hz

so 60 sq in of port for 6 12's? thats 10sq in per 12 in sub, not nearly enough port area.

my two 18's have right around 180sq in, and it should be more around 200

ronrico418
04-18-2008, 03:03 AM
so 60 sq in of port for 6 12's? thats 10sq in per 12 in sub, not nearly enough port area.

my two 18's have right around 180sq in, and it should be more around 200

It is what crossfire recommends 10" per sub tuned to 31 hz

my 4 18s have 456 sq inches - I know what I'm doin and questioned it myself. I however am going by crossfires BMF manual and wanted to double check - thats why I posted thanks for all the responses. just so ya know the manual says 1.5 cubes per with a pvc port of 3" diameter w/ a length of 10.5 inches. Pie R2 this is what comes up - my bass box pro 6.0 verifies

ronrico418
04-18-2008, 03:09 AM
so tru im trying to figuer out that with the 6 15s i got goin on.
i had mad cancellation with just one 18"walled in my jimmy had to have the windows all down, then it got really loud then

cancellation w/ 1 sub???????? is this with a SPL box???????

lil_italy773
04-18-2008, 07:07 PM
cancellation w/ 1 sub???????? is this with a SPL box???????
9 cu/ft @40hz to small of a cabin space for the sub couldnt get full transmittion line with windows up so had to do windows down to work out right so. not cancellation:crazy: ur right

galacticmonkey
04-18-2008, 07:16 PM
9 cu/ft @40hz to small of a cabin space for the sub couldnt get full transmittion line with windows up so had to do windows down to work out right so. not cancellation:crazy: ur right

WTF are you talking about? :confused:

basshedz06
04-18-2008, 09:10 PM
i don't see how that would be cancellation with 6 subs, hell a buddy of mine and i build a box for 8 p3 10's firing up and port up also and did a 149 on term with about 3000watts granted could have been louder but i think that was mostly box problems too

lil_italy773
04-18-2008, 09:34 PM
well what is it when its loud as fk with the windows all the way down, sun roof open hitting 151.2 on TL @ 46hz on 3447wrms, and when sealed up only hitting 146.8 i have no clue then i thought it was cancellation. the box was fine

Kenneth10483
04-18-2008, 09:40 PM
What kind of vehicle is it going and and what will it be used for daily or comp?

tooloud4tv
04-18-2008, 09:58 PM
it's harder to create pressure when everything is sealed up thats why some vehicles get louder when windows are up and some are with the windows down. like my tahoe get quiter on the upper notes with the windows up. but on the lower notes it hits hella harder with the windows up. it's called cabin gain.

ronrico418
04-19-2008, 12:37 AM
What kind of vehicle is it going and and what will it be used for daily or comp?


WOW thread got way off topic!!!


System is going in a Dodge Magnum. I built the box today and will post pics tomorrow. Box looks like this...

http://venemo.com/images/ca/xfire/perspective.jpg
http://venemo.com/images/ca/xfire/back.jpg
http://venemo.com/images/ca/xfire/inside.jpg
Hope those work
just used for daily.pretty nice install again I will post pics.

Kenneth10483
04-19-2008, 12:54 AM
that box should be fine as long as you got room to have the box about 4-6 inches off the back wall should sound good!

ronrico418
04-19-2008, 01:42 AM
Its at least 5" back. Can't wait to hear it tomorrow....

Slikk
05-17-2008, 09:11 PM
It's been about a month...How did the box/subs turn out???? I will be purchasing a Magnum as well and i'm going to be running 2 9515 off two saz-3000d's wondering how it turned out for you....Any cancellation issues? Got some pics i'm really interested!

ronrico418
05-19-2008, 02:29 PM
came out fine very impressive!!!

http://i130.photobucket.com/albums/p242/Ronrico418/IMG_0350.jpg

Slikk
05-19-2008, 02:33 PM
what are you running for amps??? I've been reading and there are no HO alternators made for the Magnum...If this is true I think im going to have to reconsider my next vehicle purchase :crap: