PLZ HELP for BOX DESIGN OF 6 SUBS

[ronrico418 10+ year member]

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

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[Skip01 5,000+ posts]

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 10+ year member]

you'll most likely run into phase problems with that many subs

 

[ronrico418 10+ year member]

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 10+ year member]

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 10+ year member]

This is what I have come up with

PORT 10X6 12.5"long tuned to 31hz

 

[lil_italy773 10+ year member]

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 10+ year member]

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 5,000+ posts]

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 10+ year member]

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 10+ year member]

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 10+ year member]

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 5,000+ posts]

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? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[basshedz06 10+ year member]

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 10+ year member]

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