port size fro tuning

[CHUCKmfnNORRIS 10+ year member]

i'm building an enclosure for my 12" and have a set of dimensions but need help on the port size to have it tuned to 33Hz. the enclosure is 14.5 tall 29 wide and 16 deep.

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[pro-rabbit 5,000+ posts]

what size wood and were do you want the port?

 

[CHUCKmfnNORRIS 10+ year member]

its 3/4 mdf and i would like a slot port on the left side.

 

[pro-rabbit 5,000+ posts]

with out much thought or double checking I would say 13H x 2.5W port that is around 27ish long..but I'm on my phone(so that was just figured up in my head) so that may be a bit off

 

[speakerdude123 10+ year member]

13"X2" and about 17" long will get you 33hz tuning

 

[CHUCKmfnNORRIS 10+ year member]

thanks for the quick reply guys

 

[Ronin775]

You can't tune a fro,only pick it.

 

[pro-rabbit 5,000+ posts]

what sub are you running? that will change tuning as well...hard to guess displacements.

 

[CHUCKmfnNORRIS 10+ year member]

i'm running an Incriminator Audio 12" Lethal Injection running at 750watts.

 

[pro-rabbit 5,000+ posts]

Those subs like around a 2.5ft3 box for a 12 and that is on the large side.(after all displacements)

 

[pro-rabbit 5,000+ posts]

I would do 3ft3 before displacements. Then do a 13x2 port 21.5" long. That is 33hz and after all displacements will be right around 2.5. Again this was done on a phone, but it should be correct.

 

[CHUCKmfnNORRIS 10+ year member]

i have very little space to put the sub in. i have a '99 wrangler with the rear seats removed and a bestop extendatrunk installed, it turns the back into a trunk. the inside is 15"tall 34"wide and 23deep. i talked to nick who is one of the owners of IA and he said it should be in a 2.5 box tuned to 33hz. here are a few pics of the trunk system with my old sub and amp(.95ft3 box 10"sub)much much smaller than what i have now(1.5ft3)

 

[pro-rabbit 5,000+ posts]

PMed

 

[CHUCKmfnNORRIS 10+ year member]

pm received

 

[CHUCKmfnNORRIS 10+ year member]

i can fit a 2.5ft3 but that only leaves 1.5ft3, does it matter how much space is left in the trunk?