Aero Port position help

[Masted85]

I’ve got a box I already had made for a different sub but it works with my new one. I don’t want to make another box so will this setup work? I’m just not sure of how the port will sit near the sub like drawn.

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[Masted85]

This the box I'm working with.

 

[wew lad 5,000+ posts]

It'll work, but the port is too close to the driver. I've done something similar and it did work but it effectively made the volume around the port unused. It's hard to explain.

Wouldn't you be down to nearly 1 cube net after displacement of the port and driver?

 

[audioholic 5,000+ posts]

It'll work, but the port is too close to the driver. I've done something similar and it did work but it effectively made the volume around the port unused. It's hard to explain.

You are correct. In an ideal situation, the port mouth is on the opposite end of the enclosure as the driver is. This allows a more even compression/decompression of the entire airspace within the enclosure. With the port very near the driver, it can create a tunneling effect of airflow and the perceived volume of the enclosure will go down.

And in an enclosure with multiple speakers utilizing the same airspace, ideally each driver will be equidistant from the mouth of the port. This is an error I see in homemade/custom enclosures here a lot. Not really related to this thread, but I felt this was worth adding to the above comment.

 

[Jeffdachef 5,000+ posts]

plug the hole up and move it all the way down towards the bottom more for a quick fix.

with a sub up, port back its ideally positioned like this with the sub far away from the interior port mouth.

 

[wew lad 5,000+ posts]

If you can fit the port sticking up, you could also do that and just have it flush with the top of the box and the whole port sticking out

 

[Masted85]

So like this? How far from the bottom of the box should it be? Where should the hole be positioned? How much of the port should I use?

 

[Masted85]

View attachment 23468So like this? How far from the bottom of the box should it be? Where should the hole be positioned? How much of the port should I use?

Or even coming out the side facing the camera. I just don’t know how much port to use and how far from the wall. Seems like the distance between port end and basket would be about the same.

 

[2RZ-FE 10+ year member]

6" port diameter I like to keep them 6" away from any walls. 4" port = 4" away, etc

I also like to keep the port end away from the sub magnet, whatever the sub diameter is sounds like a good minimum distance to me...

 

[Masted85]

6" port diameter I like to keep them 6" away from any walls. 4" port = 4" away, etc

I also like to keep the port end away from the sub magnet, whatever the sub diameter is sounds like a good minimum distance to me...

So either facing up or out the side would work? Also how long does the port need to be?

 

[Masted85]

If you can fit the port sticking up, you could also do that and just have it flush with the top of the box and the whole port sticking out

If I did as you said I would add the volume of the port to the volume of the box?

 

[hispls 5,000+ posts]

6" port diameter I like to keep them 6" away from any walls. 4" port = 4" away, etc

Port openings being a port length away from anything else is good practice if you want them to perform as predicted.

 

[Masted85]

Port openings being a port length away from anything else is good practice if you want them to perform as predicted.

So as the reply above states flush mount the end and have the entire port sticking up?

 

[wew lad 5,000+ posts]

If I did as you said I would add the volume of the port to the volume of the box?

No. You would calculate the net volume of the box as the internal volume (remove the width of the walls from your measurements, and subtract around .2 cubes for the driver.

 

[Masted85]

No. You would calculate the net volume of the box as the internal volume (remove the width of the walls from your measurements, and subtract around .2 cubes for the driver.

The volume with nothing subtracted is 2.188 FT^3. Sub is .11 ft^3, 2 braces I have are 0.0143 ft^3.