port area for a 07 RE XXX 15

[406er 10+ year member]

as the title states, how much cross section port area for a XXX 15

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[SeanDub 10+ year member]

Depends on cubic feet of the box. It's usually like 16 sq inches of port per cubic foot. 15s that are ported usually have about 4 cubes, so around 60 - 70 sq inches.

 

[Immacomputer 10+ year member]

Depends on cubic feet of the box. It's usually like 16 sq inches of port per cubic foot. 15s that are ported usually have about 4 cubes, so around 60 - 70 sq inches.

That's the DD generalization method. The sub plays a HUGE role in determining port area. With my single 12" sub, I can get slight port noise in a 3 cubic foot enclosure with 25in^2 of port area but I don't with two 8s in it. Why? Motor strength, suspension, power handling, excursion, and cone area all play a part as well as enclosure volume. It's NOT just enclosure volume. If that's the case, I'm going to have terrible port noise from my 5ft^3 enclosure with only 36in^2 of port area!

 

[SeanDub 10+ year member]

That's the DD generalization method. The sub plays a HUGE role in determining port area. With my single 12" sub, I can get slight port noise in a 3 cubic foot enclosure with 25in^2 of port area but I don't with two 8s in it. Why? Motor strength, suspension, power handling, excursion, and cone area all play a part as well as enclosure volume. It's NOT just enclosure volume. If that's the case, I'm going to have terrible port noise from my 5ft^3 enclosure with only 36in^2 of port area!

Then educate us on how to use sub specs to determine proper sub enclosures. I'd like to build better suited boxes, and was looking for this information last night.

 

[MemphisCherokee 10+ year member]

lots and lots

..no really, 16 square inches per cubic feet

 

[bonesninja 5,000+ posts]

i just use this generic calculator.......it seems to jive pretty close with some others i've used. the biggest factor it uses, i believe, is the xmax.

i just used the re optimal specs of 4^3@33 htz

 

[bonesninja 5,000+ posts]

thats an awful lot of port tho.....due to that insane 54 mm of Xmax

 

[Immacomputer 10+ year member]

You don't have to worry about that much excursion because it will be **** near impossible to drive the sub to full excursion around tuning, which is where port noise really becomes a problem. If the sub has low motor strength, you can cut back on port area even more. Drivers with high power handling, moderate excursion, and a strong motor will need more port area.

185in^2 is way too much for a 15" XXX.

 

[bonesninja 5,000+ posts]

You don't have to worry about that much excursion because it will be **** near impossible to drive the sub to full excursion around tuning, which is where port noise really becomes a problem. If the sub has low motor strength, you can cut back on port area even more. Drivers with high power handling, moderate excursion, and a strong motor will need more port area.
185in^2 is way too much for a 15" XXX.

i was thinking that a ton of port area.....the fart box i built for whiteice's 18" mt had 200^2. i'd still put 80"-100" on the XXX tho.

 

[90accordman 5,000+ posts]

between 75-80 is what my 15 XXX had and it sounded great

 

[bonesninja 5,000+ posts]

between 75-80 is what my 15 XXX had and it sounded great

sell me that 10" now...

 

[406er 10+ year member]

between 75-80 is what my 15 XXX had and it sounded great

what year of XXX did u have. i think ill aim for 80-100, cause the 168 thats called for is retarded

 

[bonesninja 5,000+ posts]

i think he was one of the first guys here to have the newer style like you have

 

[406er 10+ year member]

ahhh