Adire vented design questions.

Discussion in 'Home Theater Projects' started by JoeFish, Sep 4, 2003.

  1. JoeFish

    JoeFish Stunt Coordinator

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    Hey all. I'm building the Adire 85L vented design for the Shiva III using their reference design. This is my first vented sub, and my first home theater sub.

    When I calculated the actual interior volume of the box in Adire's plans, it was about 89.5l, so that's the value I'm using for my box. My box is about 89l inside, taking into account all of the bracing and whatnot.

    I've got a couple of questions:

    Would it be beneficial to use some kind of damping material on the walls of the box?

    What would I use, jute or something similar?

    Would this change the tuning of the box?

    Any other suggestions before I button it up?

    Thanks!

    -Joe
     
  2. Dave Poehlman

    Dave Poehlman Producer

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    I've heard of people putting modelling clay or dynamat on the interior of their enclosures. This is strictly to deaden the box and provided a large amount isn't used, it shouldn't affect the overall box tuning. However, if you've built a solid, well braced enclosure, I think clay or dynamat is a little extreme IMO.

    Also, if you haven't considered it: HERE is an article from a car audio website that says even ported enclosures will benefit from stuffing with polyester fiberfill.
     
  3. JoeFish

    JoeFish Stunt Coordinator

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    I'm aware that stuffing the box will make it appear larger, but if the alignment of the vented box is designed for 89l, won't stuffing it ruin the alignment?

    I had contacted Adire about this and they said...let me find the email...I had asked them if it was OK to build the box a bit smaller and stuff it. They responded:

     
  4. Chris Tsutsui

    Chris Tsutsui Screenwriter

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    Yeah, I'd go to walmart and pick up 5lbs of polyester fiberfill for about $5-6. Fill the box lightly and keep the stuffing away from the driver or ports. I've heard of cases where stuffing was melted onto the driver. If you fill the ports with polyfil they won't perform the same, and it may just shoot fil out onto the floor. [​IMG]

    I just tried out this new stuff called polyester clusters. It seems to work just as well as polyfil except it's easier to work with.

    When i put fill in a box, it seems to basically tighten up the bass a bit, and slightly reduce boom. I wouldn't coat the sides of the box with anything like dynamat as that most likely won't help.
     
  5. Andrew Pratt

    Andrew Pratt Producer

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    If you run the sims with box's 5-10 percent larger or smaller you'll see that it really won't make that much difference so don't sweat the small stuff and enjoy your sub. I lined my walls and added a little stuffing but it was more because I could then I needed to if you know what I mean.
     
  6. Dave Poehlman

    Dave Poehlman Producer

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  7. JoeFish

    JoeFish Stunt Coordinator

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  8. JoeFish

    JoeFish Stunt Coordinator

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    Hello everyone! I wanted to thank you again for your suggestions, and post some pictures so you could see my progress.

    The sub is now in my living room, performing like a champ. On movies like the Two Towers, the bass is immense, especially the flapping dragon wings. On music, the bass is tight and clean, and not overpowering. I'm happy with it, to say the least.

    Click here to see the build process.

    -Joe
     
  9. Dave Poehlman

    Dave Poehlman Producer

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    It looks great, Joe! Looks like a monster!

     
  10. JoeFish

    JoeFish Stunt Coordinator

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    I'll be naked for a little while [​IMG] I plan on veneering it and putting a chessboard top on it to use as a coffee table.

    We'll see how soon that gets done [​IMG]

    -joe
     
  11. JoeFish

    JoeFish Stunt Coordinator

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  12. Frank Carter

    Frank Carter Screenwriter

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    I hope that's a typo Joe[​IMG] [​IMG] [​IMG].
     
  13. JoeFish

    JoeFish Stunt Coordinator

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    Nope [​IMG] I do wonder why the neighbors don't visit so much lately, though...

    -Joe
     

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