Tempest DIY. A few questions please

Discussion in 'Archived Threads 2001-2004' started by Chris_Campbell, Jan 29, 2001.

  1. Chris_Campbell

    Chris_Campbell Stunt Coordinator

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    Hello all, I'm nearing completetion of my tempest sonotube sub, and I have a few questions. But first, here is a little info to help: it's approx 9.2 ft^3, receiving 750 watts, tuned to 20 hz, with ports 15.1 inches long (2x4" diam).
    1. Unfortunately due to build complications (and this being my first DIY) I couldn't get one of the ports to stand exactly verticle in the enclosure. Will this cause a problem? It's tilted about 10 deg to one side.
    2. I'm using plumbers PVC for the ports, and no flares [​IMG] Will this cause problems?
    3. I'm planning to run the speaker in series because my amp (carver pm350) won't do a 4 ohm mono load, but will do 16 ohm mono (interestingly puts out 750x1 @16ohm, and only 350x2 @8ohm stereo). Will this cause any problems over a parallel config?
    4. So far I'm not using any kind of stuffing or batting. Is this really neccessary?
    Thanks folks for all your help the whole way through. I just hope this thing comes out to be more than a hack-job.
    Chris
     
  2. DanWiggins

    DanWiggins Second Unit

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    Chris,
    1. No problem.
    2. You'll lose a bit of output at peaks; for most listening levels, though, it won't be a real problem (typically you'll be running less than 100W into that design; peaks will be higher, though).
    3. No problem with series connection. And the power ratings of the Carver just mean that it's current - not voltage - limited.
    4. I'd recommend some lining. Use either R-9 fiberglass around the inside, or 3 layers of 1" thick polyester batting (like used inside quilts). Personally, I go the poly route, because it's easier to use and less itchy. Also bunches easier, if needed.
    Hope this helps!
    Dan Wiggins
    Adire Audio
     
  3. Chris_Campbell

    Chris_Campbell Stunt Coordinator

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    Thanks Dan, you've been a great help! Do you know where I might be able to acquire this stuff?
     
  4. DanWiggins

    DanWiggins Second Unit

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    Chris,
    I assume you mean the polyester batting? Pretty much any fabric store will have it. Ask for quilt stuffing. It comes in a sheet form (typically either bagged, or off the bolt. Cheaper to buy off the bolt).
    Dan Wiggins
    Adire Audio
     
  5. Neil Joseph

    Neil Joseph Lead Actor

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    Real Name:
    Neil Joseph
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    Patrick Sun Moderator
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