Need help with box design/calculations

[Slappin709 10+ year member]

I'm thinking about how to design my next box. It will be for 4 12's. I know the sub choice is disappointing but I'm a high school student with little money, just trying to have fun. I've had a single 10" before but it wasn't enough. The subs will be Dual DS12's, just shitty single 4 ohm standard drivers. I was thinking about 7 cubes(1.75 per sub) at 34hz. The plan is subs up, port back, using a 12" sonotube(~113" port area). It will be going in a late 90's Escort wagon. They will be ran off of a Hifonics Brutus BXI1210D @ 1ohm. I'm having problems trying to calculate the box volume/tuning. I don't understand how to tune regarding including or not including the displacements of the bracing, subs and the port. If I'm looking for 7cubes with a final tuning of 34hz how would I go about getting that? Thanks!

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[thehardknoxlife 10+ year member]

I'm thinking about how to design my next box. It will be for 4 12's. I know the sub choice is disappointing but I'm a high school student with little money, just trying to have fun. I've had a single 10" before but it wasn't enough. The subs will be Dual DS12's, just shitty single 4 ohm standard drivers. I was thinking about 7 cubes(1.75 per sub) at 34hz. The plan is subs up, port back, using a 12" sonotube(~113" port area). It will be going in a late 90's Escort wagon. They will be ran off of a Hifonics Brutus BXI1210D @ 1ohm. I'm having problems trying to calculate the box volume/tuning. I don't understand how to tune regarding including or not including the displacements of the bracing, subs and the port. If I'm looking for 7cubes with a final tuning of 34hz how would I go about getting that? Thanks!

How much are those Duals?

 

[Slappin709 10+ year member]

Like $60 CDN a piece haha. Not looking for good numbers clearly haha. There isn't even a comp in my province that I know of. Just a fun building project moreless.

 

[thehardknoxlife 10+ year member]

Like $60 CDN a piece haha. Not looking for good numbers clearly haha. There isn't even a comp in my province that I know of. Just a fun building project moreless.

Screw that. Get these instead.

 

[Slappin709 10+ year member]

Get what instead?

 

[thehardknoxlife 10+ year member]

Get what instead?

Click "these".

 

[Slappin709 10+ year member]

Click "these".

Wow I totallly missed that. I guess i'll decide when the time comes.

Do you know the answer to the box question?

 

[thehardknoxlife 10+ year member]

Wow I totallly missed that. I guess i'll decide when the time comes.
Do you know the answer to the box question?

Well, if you get the PG's then the box you want will be a bit big for those. Also you didn't list your maximum dimensions. That's rule #1 when fishing for a box design.

 

[Pr1m3 10+ year member]

For volume related to tuning you need to subtract bracing, sub displacement, and the space the port takes up.