calculating port area with aero ports?

[imhungnurnot 9]

I hear that areo ports "trick" the box into thinking that it actually has more port area than it actually has. Is there some type of calculation so I can figure out the effective port area of an Aero Port?

Thanks

[hondakilla98 29]

From what I've read. The "trick" is that everyone thinks that you need less port area with aero's.

[slim2fattycake 85]

Man, for a second, I thought this was another how to find area of a circle lol.

Check this out. GlassWolf's Homepage

[KU40 173]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

[GlassWolf 5]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

this.

also try this if you want fast and simple:

flared port/aero port calculator

[hondakilla98 29]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

this.

also try this if you want fast and simple:

flared port/aero port calculator

All that calculator does is account for the flare. It gives you the straight port length and then the flared port length. It doesn't tell you anything about port area.

Here's a link to a recent thread about the same topic. The search function is your friend

http://www.soundsolutionsaudio.com/forum/PSP-port-questionshelp-t39556.html&hl=psp+port

Edited May 28, 2010 by hondakilla98

[imhungnurnot 9]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

Will the 50-75 percent reduction in port area result in a decrease in output?

[1200 bandit 2]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

Will the 50-75 percent reduction in port area result in a decrease in output?

No it will not, do to the smaller enclosure size

[imhungnurnot 9]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

Will the 50-75 percent reduction in port area result in a decrease in output?

No it will not, do to the smaller enclosure size

??? wouldn't the enclosure only be smaller due to the smaller displaced volume of port? so you would still use the same internal volume after sub and port displacement has been subtracted? correct? so the "net" volume would be equal but the "gross" volume would be smaller.. right?

[KU40 173]

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area.

However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size.

But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.

Will the 50-75 percent reduction in port area result in a decrease in output?

No it will not, do to the smaller enclosure size

That has nothing to do with it.

No, the decreased port area won't have any affect on output so long as the area is still sufficient to keep the air velocity through the port down. That's really how more port area (such as in a slot port) helps you, by decreasing air velocity through the port. So if your port velocity is 13 m/s with a 100 sq. inch slot port and 13 m/s with 60 sq. inches of aero port, there should be no difference.

[imhungnurnot 9]

That has nothing to do with it.

No, the decreased port area won't have any affect on output so long as the area is still sufficient to keep the air velocity through the port down. That's really how more port area (such as in a slot port) helps you, by decreasing air velocity through the port. So if your port velocity is 13 m/s with a 100 sq. inch slot port and 13 m/s with 60 sq. inches of aero port, there should be no difference.

THANKS!!!!! So you get more output as you decrease port air velocity? (even if its too small of an increase to hear; i.e. theoretically)

[Impious 1,476]

Man, for a second, I thought this was another how to find area of a circle lol.

Check this out. GlassWolf's Homepage

also try this if you want fast and simple:

flared port/aero port calculator

I see you copy-n-pasted Neil's article on to your site without giving any reference or credit to the author or source;

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

Given the amount of time and associated knowledge and research that it takes to create a write-up such the above, it is generally a polite consideration on the internet to give credit where credit is due rather than plagiarizing the text.

[imhungnurnot 9]

That's messed up GlassWolf, but anyway.. Do you get more output as you decrease air velocity in the port? (even if its too small of an increase to hear; i.e. theoretically)

[KU40 173]

There's a bit of a range of where increasing port area can be helpful and a point of diminishing returns. For example, with an average 12" sub, 5 sq. inches of port area would act more like just a leaky hole in the box and not like a port at all, and you wouldn't see the beneficial gains of having a port. 20-50 sq. inches may be acceptable, and 50 sq. inches may be like .2 db louder than 20. But then as you keep increasing port size, diminishing returns sets in and you can even reach a point where too much port area is detrimental. If you try and put like 500 sq. inches of port area on one 12" sub, it's not going to act like a port at all either, and more like just a giant leaky box or even just free air, since there won't be enough back pressure through the port to help the suspension of the sub keep it in line. So you do need some resistance through the port, but not too much.

[imhungnurnot 9]

There's a bit of a range of where increasing port area can be helpful and a point of diminishing returns. For example, with an average 12" sub, 5 sq. inches of port area would act more like just a leaky hole in the box and not like a port at all, and you wouldn't see the beneficial gains of having a port. 20-50 sq. inches may be acceptable, and 50 sq. inches may be like .2 db louder than 20. But then as you keep increasing port size, diminishing returns sets in and you can even reach a point where too much port area is detrimental. If you try and put like 500 sq. inches of port area on one 12" sub, it's not going to act like a port at all either, and more like just a giant leaky box or even just free air, since there won't be enough back pressure through the port to help the suspension of the sub keep it in line. So you do need some resistance through the port, but not too much.

Great post, Thanks!