Yet even more Tempest questions..

Discussion in 'Home Theater Projects' started by John Wes, Jun 6, 2003.

  1. John Wes

    John Wes Stunt Coordinator

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    Ok but only a couple. [​IMG]

    First...a comparison...

    I'm not sure whether to go sealed or ported. I'm looking to at least hit 20 Hz with it. The Adaire alignment in a ported enclosure looks like it will do this just fine.. Sealed, well, I can't find any specs on Adaire's site as to if it will or not. I'm going to use this as a 70/30 on the music side..

    Secondly, can I hook up say, two plate amps, each to a separate coil of the driver? Ok I'm sure I can but is there a benefit to doing so, or any repercussions I should think of first?
     
  2. Lee Carbray

    Lee Carbray Second Unit

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    I will try and answer your second question. Experts correct me if I am wrong.

    There is no benefit to running two plate amps, one to each VC. This is because each VC is 8 Ohms. So for example if you were thinking of using the PE 250w amp it only puts out 180w into 8 Ohms. So you would be basically paying for extra power you could get by connecting the coils in parallel to a 4 Ohm load.
     
  3. Patrick Sun

    Patrick Sun Moderator
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    You won't hit 20Hz in a sealed enclosure (+/- 3dB for its frequency response all by itself) but with room gain, you might get close, and might not even need the uber low end oomph in return for getting a little better transient response from the sealed configuration for music. A sealed 5 ft^3 Tempest (stuff it with 3 to 5 pounds of polyfill, stuff to your personal taste in bass) with a single 250W amp should be fine unless you have a large room to fill.

    And yes, you probably won't need to use 2 amps to feed each voice coil with a Tempest.
     
  4. Kyle Richardson

    Kyle Richardson Screenwriter

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    Ditto to the 2 previous posts.
     
  5. TimForman

    TimForman Supporting Actor

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    These are the SPL measurements from my MidQ Sealed Tempest. You can decide for yourself. These measurements were taken at the listening position prior to adjusting my BFD which corrected the dips and peaks caused by my room.

    FREQRAW SPLSPL (comp)
    168596.5
    1897105.0
    2098105.5
    2294100.5
    2595100.0
    2896100.0
    31.59699.0
    36100102.5
    40105107.5
    45103105.0
    509091.5
    568485.5
    639495.5
    71107108.5
    80104105.5
    89103104.5
    1009193.0
    1118990.0
    1258181.5
    142.58989.5
    1607877.5
     
  6. John Wes

    John Wes Stunt Coordinator

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    Thanks for all your input, guys. This is really a lot of help. [​IMG]
     
  7. John Wes

    John Wes Stunt Coordinator

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    Just a couple more.

    Is there a way to have my cake and eat it too?

    I'm not worried about size soooo......If I port it, will I be satisfied with how it sounds musically? Will it be a bit to slow?

    I was thinking about Adair's alignment..of a 214L cabinet and two 3 inch flared ports.

    Again, thanks for your input.
     
  8. Travis-J

    Travis-J Agent

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    Im thinking of building a MidQ Sealed Tempest. First time DIY builder. How is the best way to hook up a plate amp to their design? Where does it fit in??
     
  9. John Wes

    John Wes Stunt Coordinator

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    Just cut the hole for it on the side your going to consider the back. It's even more rigid than the MDF or Birch you would use for your cabinet. Make sure your not cutting into where your braces would go.
     

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