Port Area (Port Diameter)

[billy18bm 10+ year member]

Ive looked at lots of threads and everyone seems to say that port area (diameter) needs to be 12-18 in^2 for each cubic foot..

Is this just a known fact or are there calculations that are involved for the "ports diameter"(I understand port area and length affect the tuning). Also how does going higher or lower on the ports diameter affect the boxes performance.

and do these "RULES" apply to AERO ports flared and unflared?..

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[azimuth 5,000+ posts]

for flared aero's, you can do about 1/2 the port area as a slot.

 

[billy18bm 10+ year member]

so are those numbers 12-18 in^2 correct?

 

[snb778 5,000+ posts]

12 is for more SQ LSQ subs... 16-18 for SPL/ street beaters

 

[billy18bm 10+ year member]

Type-X... = SQ

L7 and W7 = street beater right?...

im tuning my box at 36hz and i think a 2 type-x's would sound great any thoughts?

 

[billy18bm 10+ year member]

anyone else have input on this TOPIC..

 

[Notloud00 10+ year member]

type r is much louder then type x. if ur doin aeros do 2 or 3 4" aeros and 2 audioque sd 2.5's in 4 cubes tuned around 36hz. it would dominate type x's.

 

[Louisiana_CRX 5,000+ posts]

go type R's

 

[azimuth 5,000+ posts]

type r is much louder then type x. if ur doin aeros do 2 or 3 4" aeros and 2 audioque sd 2.5's in 4 cubes tuned around 36hz. it would dominate type x's.

i disagree that a single type R is much louder than a single type x. the type x won't perform well as an spl sub, but in a box made for a daily driver, i'd take the type x any day.

 

[billy18bm 10+ year member]

how much port area should i have if im using flared aero ports for around 4.5 cubes.

 

[skmfkr 5,000+ posts]

i would do 3 4"

 

[competitiveaudi 10+ year member]

so with a wall that has 12 cuft i need to do around 144sq in? if im tuning my box to 38 hrz how long would that port need to be?

 

[Seth_3515 10+ year member]

if its a 12 by 12 vent it will need to be 13.17 inches long...btw thats with three type r's in a 12 cu enclosure

 

[competitiveaudi 10+ year member]

if its a 12 by 12 vent it will need to be 13.17 inches long...btw thats with three type r's in a 12 cu enclosure

mine will be with 2 18s. the port will more then likely be 4 x 36" so would i still do 13.7" deep?

 

[chunky cumz 10+ year member]

4 6" ports the end /thread