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Thread: Port bracing question

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    Port bracing question

    I am about to build a new ported box. As I was designing my box I was thinking of adding small braces in the corners of the port to smooth out air flow. My question is do the small braces effect port length calculations or box size? I am wondering about the red areas.
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    Re: Port bracing question

    I would add the bracing to help with flow ! Might effect frequency in hZ ( possibly higher frequency ), the "Hit" may be a lil more, if "chuffing" is not a concern , go for it.

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Port bracing question

    Making the air passage smoother is usually a good thing. Just be careful about making the corner wedges too large because then you'll be adding a narrow restriction to the air passage in that spot. The impact on tuning might result in the port behaving as if it were slightly shorter due to the reduced air resistance, but I'm not sure if it would be very noticeable. The 90-degree turn of the port on the inside of the box (top-most red triangle brace) would make the port behave as if it were slightly longer and the effect can be estimated with something called an "end correction" factor.
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
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    Re: Port bracing question

    ^That^ and maybe round nose (Bull nose) over the male section with a router bit?

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    Owner BigAl205's Avatar
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    Re: Port bracing question

    As long as dimension A isn't less than dimension B, you should be good

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Port bracing question

    Quote Originally Posted by BigAl205 View Post
    As long as dimension A isn't less than dimension B, you should be good
    Yeah, that!
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
    Do it for them.

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    Re: Port bracing question

    Cool. Thank you all for the input.

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    Noob JCsAudio's Avatar
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    Re: Port bracing question

    Look into round flared ports too. If you can fit them they offer higher efficiency over slot ports because they have the smoothest air flow. These are what I use most of the time. https://www.parts-express.com/precis...e-kit--268-352
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    Re: Port bracing question

    Quote Originally Posted by JCsAudio View Post
    Look into round flared ports too. If you can fit them they offer higher efficiency over slot ports because they have the smoothest air flow. These are what I use most of the time. https://www.parts-express.com/precis...e-kit--268-352
    I second this recommendation. Smoother airflow = reduced vent noise per vent area compared to ordinary slot ports. There are additional sizes and accessories: https://www.parts-express.com/brand/precision-sound/285

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    Re: Port bracing question

    Quote Originally Posted by Surfer J View Post
    I am about to build a new ported box. As I was designing my box I was thinking of adding small braces in the corners of the port to smooth out air flow. My question is do the small braces effect port length calculations or box size? I am wondering about the red areas.
    Click image for larger version. 

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    I believe that you'll need to slot to vent outside the box...

    IMO...
    At least round over the "A dimension" across from the red bits... that may be more critical than the deep corners where the wind never really is able to get to. The wind should be very stressed there at the male side, and likely to shear away from the sharp corner cause some noise.

    If we take the flared round vent as being superior to slot in terms of smoothness of flow...
    Then in the limit... one gets to a Passive Radiator having the least amount of chuffing, tumble and swirl.

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