Smallest box possible for Shiva?

Discussion in 'Archived Threads 2001-2004' started by Jim A. Banville, Jan 2, 2003.

  1. Jim A. Banville

    Jim A. Banville Supporting Actor

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    What are the dimensions for the smallest sealed box I can make for a Shiva 12" driver that has a Q around 7?

    thanks
    Jim
     
  2. For a q=0.707 with no fill and no leaks and 0.1ohm series resistance, you need 62L.
    For a q=0.707 with heavy fill and no leaks and 0.1ohm series resistance, you need 38L.
    or just follow the white papers for the Shiva at adire.
    ..or get a linkwitz transform and put it in a box the size of an acorn [​IMG]
     
  3. Brian Bunge

    Brian Bunge Producer

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    Or get a Dayton DVC 12" driver and use a 30L enclosure, heavily stuffed.
     
  4. Greg Monfort

    Greg Monfort Supporting Actor

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    After factoring in some VC heating and reducing the cab by stuffing it with 3.0lbs of R-19 fiberglass, 2ft^3 plus driver and bracing. Call it a 16" i.d. cube.

    GM
     
  5. Jim A. Banville

    Jim A. Banville Supporting Actor

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    Thanks guys. I downloaded the PDF file on the .7 Q design which suggests a 54L (1.9 cubic ft.) design. I'm not happy with the 3~4 cubic ft. vented box its currently in. Can someone suggest someplace to buy a pre-fab 2 cubic ft. box? I don't feel like building one [​IMG] By the way, how do I keep the filler material from getting on the amp? Is there some high-temp/fire resistant material I can staple over the amps internal circuitry?
    thanks
    Jim
     
  6. Patrick Sun

    Patrick Sun Studio Mogul

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    Have you considered just plugging up the port, and putting some bricks inside the enclosure to soak up the extra volume? That would at least give you an idea of how the Shiva would perform without paying for an enclosure, and if you were satisfied with a smaller sealed enclosure, you could then go looking for someone to build it for you.
    BTW, Parts Express offers 3 ft^3 enclosures, but they are pricey considering the raw materials involved.
     
  7. Jim A. Banville

    Jim A. Banville Supporting Actor

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    Actually, I think I will cut my current box down to 2 cubic ft. Thanks!
     
  8. AllanRW

    AllanRW Second Unit

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    http://quicksitebuilder.cnet.com/wrn...tics/id15.html
    I built a 14" cube CNC machined for Bob at CSS and was shown at the NW DIY.
    Running the RCM 150 AMP with a 6db boost at 35hz.
    These cabinets will be up for sale in the following month or so.
    Just getting all the info ready for Bob to post.
    But the cost for a cabinet ready to assemble with 45 lock miter joints is very low on the pocket book.
    And best you can assemble with or without clamps.
    And ready for finish of your choice in 2hrs time.Just enough for the glue to dry.
    These can be ordered with or with out driver holes and amp holes cut as well.
    And a option for cutting a second cabinet volume is in the works as well.
    Just by picking the dato you assemble the driver board into will give you different volumes.For different drivers besides the Shiva.
    Good luck with you design.
    Al
     
  9. Ben Ven

    Ben Ven Stunt Coordinator

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    Jim,

    I had my Shiva in a 38 L sealed enclosure. I was not impressed. It was in an 85 L sealed enclosure prior to the smaller box. It is now in a ported 70 L enclosure tuned to about 20 Hz. Much better in a larger box. I was disappointed with the performance in the small sealed box.
     
  10. AllanRW

    AllanRW Second Unit

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    With boost without how much at what frequency???
    I do know this has been in the works with Dan and Bob.
    So I know it is a provine design.

    Al
     
  11. Ben Ven

    Ben Ven Stunt Coordinator

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    No boost. The sound quality in a larger box is much better IMHO. Articulate, tight, deep are words that come to mind. I was just listening to a classic... U2's Achtung Baby..Track #12 Love is Blindness. Never heard that quality bass from the small sealed box. The Babbs don't sound too shabby either-95 dB at my listening position with peaks to 100 dB.
    Maybe with an LT you can get better quality out the the smaller boxes. And 70 L (2.5 ft^3)is not too far off from Jim's 2 ft^3 box idea.
    Don't get me wrong, the small box sounded good but the larger box brings the Shiva to life! Ask my wife, she can't stay in the room anymore!
     

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