I am going to make a box with aeroports for a 15" Fi Q powered by a SAZ-1500. My deminsions that I have available are 34"x30"x14". I was able to get 4 4" aeroports with both sides flared from someone which should fit in the 12-16 of area per cubic foot. I was looking at a box that had outer deminsions of 32"x28"x13" to get just over 4 cu. ft. after sub and port displacements tuned to 32 hz. After doing the calculations for the box I have found out that I am suppose to use 29-30" long aero ports and that will not be able to fit so I was thinking of tuning a little higher. I was wondering what is the rule on the distance the aeroport should be from the back wall so I can see how high I would have to tune it? If anyone has any suggestions on a different way to go about this your suggestions are highly welcomed.

You can always put a bend in the ports, no need to keep them straight. Plumbing shops have pvc elbows.

The distance from the port to the back wall should be at least equal to the diameter of the port.

a key rule that you didnt mention that i follow when designing for aeros, you only require just a little more than half the surface area using aeros than you do using slot ports.

try 2 or 3 aero's and see the length that it gives you.

-Robin

a key rule that you didnt mention that i follow when designing for aeros, you only require just a little more than half the surface area using aeros than you do using slot ports.

try 2 or 3 aero's and see the length that it gives you.

-Robin

thats the first time I've read or heard anywhere .

aside from the fact that a slotted port has portarea losses in the corners because of the extra turbulence and often doesnt have kerfed ends (what actually alows you to keep the port shorter) , I see no reason why an aeroport would require half the surface-area , ofcourse the inner suface of an slotted port needs to be smoothed to minimize air-turbulence in the port and that is what what a lot of people forget to do ....

the way I see it : the purpose of an aeroport defeats itself when you need more than 2 of them , inner-port surface area is key , offcourse if you want to do more than 2 for aesthetic reasons or because you're to lazy to smoothen a slotted port , I've got nothing against it ... both works just fine .

oh one more note , I've seen tenth's gained by smoothing an aeroport , so those aren't that smooth eighter (tuning practically did not change) .

a key rule that you didnt mention that i follow when designing for aeros, you only require just a little more than half the surface area using aeros than you do using slot ports.

try 2 or 3 aero's and see the length that it gives you.

-Robin

thats the first time I've read or heard anywhere .

aside from the fact that a slotted port has portarea losses in the corners because of the extra turbulence and often doesnt have kerfed ends (what actually alows you to keep the port shorter) , I see no reason why an aeroport would require half the surface-area , ofcourse the inner suface of an slotted port needs to be smoothed to minimize air-turbulence in the port and that is what what a lot of people forget to do ....

the way I see it : the purpose of an aeroport defeats itself when you need more than 2 of them , inner-port surface area is key , offcourse if you want to do more than 2 for aesthetic reasons or because you're to lazy to smoothen a slotted port , I've got nothing against it ... both works just fine .

oh one more note , I've seen tenth's gained by smoothing an aeroport , so those aren't that smooth eighter (tuning practically did not change) .

I have never tried aeroports before but a friend had some and asked me if I wanted to try them out so I figured I would and if I dont like it then I can go back to my current box.

Could you explain the part of having more than 2 defeats the purpose of aeroports? Are you saying it would be better if I could get 2 6" ports from him instead of using the 4 4" ports?

a key rule that you didnt mention that i follow when designing for aeros, you only require just a little more than half the surface area using aeros than you do using slot ports.

try 2 or 3 aero's and see the length that it gives you.

-Robin

thats the first time I've read or heard anywhere .

aside from the fact that a slotted port has portarea losses in the corners because of the extra turbulence and often doesnt have kerfed ends (what actually alows you to keep the port shorter) , I see no reason why an aeroport would require half the surface-area , ofcourse the inner suface of an slotted port needs to be smoothed to minimize air-turbulence in the port and that is what what a lot of people forget to do ....

the way I see it : the purpose of an aeroport defeats itself when you need more than 2 of them , inner-port surface area is key , offcourse if you want to do more than 2 for aesthetic reasons or because you're to lazy to smoothen a slotted port , I've got nothing against it ... both works just fine .

oh one more note , I've seen tenth's gained by smoothing an aeroport , so those aren't that smooth eighter (tuning practically did not change) .

In-depth way of calculating the required length of a flared port - SSA Car Audio Forum

This thread has all the math and explanations you need

The exact % is roughly 56% less port area with aero ports.

this calculation aplies too all ports that are flared ... up to the point where port-compressionbecomes an issue .

I was referring to the walls of a port , when air flows close to a surface its will always be turbulent because the air tries to stick to that suface which acts like a cushen and thus makes the effective portarea smaller .

the higher the speed of the air the thicker that cushen gets . the less surface there is that the air is to cling to the less turbulence there is close to that suface , the smoother that surface the less turbulent also .

That is why I'd try to minimize the number of ports

difficult for me to type out this stuff because english is not my native language, hope you all get my point

this calculation aplies too all ports that are flared ... up to the point where port-compressionbecomes an issue .

I was referring to the walls of a port , when air flows close to a surface its will always be turbulent because the air tries to stick to that suface which acts like a cushen and thus makes the effective portarea smaller .

the higher the speed of the air the thicker that cushen gets . the less surface there is that the air is to cling to the less turbulence there is close to that suface , the smoother that surface the less turbulent also .

That is why I'd try to minimize the number of ports

difficult for me to type out this stuff because english is not my native language, hope you all get my point

try using just 2 4" aeros instead