Shiva, 142.5L, and 21hz - Completed

Discussion in 'Home Theater Projects' started by Russell R, Sep 6, 2003.

  1. Russell R

    Russell R Stunt Coordinator

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    Hello,
    My sub is built and am integrating into hometheater. It sounds good. Gobs of bass. LOTR 1/2, Phantom Menace: Pod Race, no problems. I have to get used to this type of bass. I plan on building a second sub of some type complement the room.

    Thank you,

    Russell
     
  2. Jonny K

    Jonny K Second Unit

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    Awesome. [​IMG]


    Jonny K.
     
  3. Andrus_R

    Andrus_R Stunt Coordinator

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    woohoo another convert[​IMG]
     
  4. Russell R

    Russell R Stunt Coordinator

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    Hello,
    Now that the sub is working, I am wondering what to do next. What would happen if I added some convoluted foam to the inside walls? Will I need to subtract this from the total 142.5L volume, or does it play in a different part of the equation? Keep this in mind, I built this wil very a very heavy PVC tube. Just wondering how this would affect the sound. Also, what about stuffing? Would I have to retune? I am not ready to create a new sub platform, but just want to tweak what I already have. I plan on getting a BFD to help integrate into the room.

    Thanks,
    Russ
     
  5. Stuart Mundy

    Stuart Mundy Agent

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    Nice one Russell
    Thats a great sub you have built, I have had the same for a few months now and run it in conjunction with a sealed 88 litre shiva.
    Its bass heaven on a budget
     
  6. Dave Poehlman

    Dave Poehlman Producer

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    Pictures?
     
  7. Russell R

    Russell R Stunt Coordinator

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    How do I post pictures to this thread?
     
  8. Russell R

    Russell R Stunt Coordinator

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    Yes, I tuned to 21hz based on the PE250 rumble filter @ 19hz. Yes, I was thinking about lowering it to 18hz. I am currious about lining the tube with something to help dampen the resonance. What do you think about this? Will the egg crate foam need to be subtracted from the 142L volume? I am puzzled?

    Thanks,
    Russell
     
  9. Dave Poehlman

    Dave Poehlman Producer

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  10. Russell R

    Russell R Stunt Coordinator

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    Hello,
    I posted a picture of the sub and amp on my site.

    http://users2.ev1.net/~roder/

    Just follow the link to RODERPLEX. Not a good pic, but something to show off. I need to complete the finish.

    Thanks,
    Russell
     
  11. Russell R

    Russell R Stunt Coordinator

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    Hello Jack,
    I guess I do not understand how adding filler into an enclosure will add volume. Is it due to the increased surface area? I did some music listening tonight and this sub sounds pretty good. I will make another, but would like to make it even tighter sounding. Possibly the Adire DPL12 / 75L. This is a sealed sub correct?

    Thank you,

    Russell
     
  12. Joe Tilley

    Joe Tilley Supporting Actor

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    Russell, The foam will slow down the backwave of the sub making the enclouser appear larger, same as poly fill, or even fiber glass. You can experment with differnt matirels & amounts to acheve differnt results, just don't go over board. My self I prefur the foam because its easy to work with & is very neat in apperance compared to poly or glass.
     
  13. Neil Joseph

    Neil Joseph Lead Actor

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    Real Name:
    Neil Joseph
    I merged your 2 threads. My fellow moderator Patrick Sun's guidelines for keeping one thread for each project is a good one. It makes it easier to track each members project and offer help to you.
     
  14. ThomasW

    ThomasW Cinematographer

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    I use damping material in every 'box' enclosure I build. But I don't use it to increase the apparent box size.

    Damping material (either aoustical foam, fiberglass, felt gasket material, etc) will absorb the higher frequencies that aren't filtered out by the XO. That results in better/clearer bass definition.

    Lining the walls of a ported sub with a couple inches of material is adequate.

    One can 'tune' the performance of both ported and sealed designs by adding increasing amounts of damping. Add about ~1/4 of a pound of material at a time. After adding each amount, audition the sub. The bass will tighten. When the bass stops getting tighter and the only audible effect is a decrease in output efficiency, remove the last amount added.
     
  15. michael-e

    michael-e Agent

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    dpl12 can be used in ported box.i would prefer it ported
    the epb is for sealed

    BUT youl want PRs i dont see the port i want,fitting in
    its only 84db efficient also..

    the DPL12 is supposed to be more cleaner,and according to mfk-projects.com too..



    cheers
    Mike
     

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