How does internal port bracing affect the tuning

[vehementSPL 10+ year member]

Say you your port is 30x12 inches. 6 inches deep. Now if you do a brace top to bottom in dead center of the port to make sure minimum flex . so say the brace is 1 inch thick by 3 inches deep by 12 inches tall (the full height of the port). Now the brace is shorter than the full length of the port so technically not two ports. How does this affect the tuning? does it do anything?

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[vehementSPL 10+ year member]

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[hoxie08 5,000+ posts]

i cant know

 

[audioholic 5,000+ posts]

Why does your port require such extensive bracing anyway?

Maybe its just late, but your description is very hard to visualize. It sounds like you are putting a bracing wall down the middle of most of the length of the port. I say just use some threaded rod, or round wooden dowel material, strategically placed within the port. Take up much less airspace, reduce your tuning concerns, and Im confident would be adequate.

To answer your question, your port would be choked down to a smaller port area size. How much should be easy to calculate.

 

[vehementSPL 10+ year member]

Why does your port require such extensive bracing anyway?
Maybe its just late, but your description is very hard to visualize. It sounds like you are putting a bracing wall down the middle of most of the length of the port. I say just use some threaded rod, or round wooden dowel material, strategically placed within the port. Take up much less airspace, reduce your tuning concerns, and Im confident would be adequate.

To answer your question, your port would be choked down to a smaller port area size. How much should be easy to calculate.

Well that is what I am saying. say you take one 200sq in port vs 2 100 sq inch ports the 2 ports tune higher. And that is my concern. Putting something in the port. How does this honestly affect the tuning. In general on all boxes. and yes you were correct

 

[audioholic 5,000+ posts]

I thought you said the bracing will be sized/placed in such a way so as to not create two separate ports?

 

[vehementSPL 10+ year member]

Well from the front of the port looking into it. will be Port brace port. So going from top to bottom does divide them in theory. Just a lot shorter than the normal port. I have always wondered this

 

[audioarsonal 10+ year member]

If you seperate them your gonna need to double the length to achieve the same tuning freq.

 

[maldecido33 10+ year member]

To brace a port wall, instead of bracing in the middle of the actual port, just brace between the port wall and wall(s) contained in the chamber of the box.

If you have that much flex in your port alone, I think the rest of the box design is going to need some revamping.

 

[maldecido33 10+ year member]

Well from the front of the port looking into it. will be Port brace port. So going from top to bottom does divide them in theory. Just a lot shorter than the normal port. I have always wondered this

It's overall a bad idea; it will disrupt airflow, throw tuning off a small amount (it takes away from port area), but it actually won't divide the port into two separate ports. There are far more effective ways to brace a box.