DIY sub plan (WinISD) - please review:

Discussion in 'Home Theater Projects' started by Kenneth Harden, May 25, 2005.

  1. Kenneth Harden

    Kenneth Harden Screenwriter

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    This woofer:

    http://www.partsexpress.com/pe/showd...number=295-560

    This amp:

    http://www.partsexpress.com/pe/showd...number=300-806

    This port:

    http://www.partsexpress.com/pe/showd...number=268-352

    ~7 cu. ft. box. tuned to 20 Hz.

    Gets me at a -3 point of 20 Hz. and at 1 meter, max SPL's around 110-115 dB.

    Seems for under $500, this would be hard to beat.

    What am I missing?

    Thanks!

    ANOTHER QUESTION:

    If I made a 15 cu. ft. box (HUGE!!!!!), the program says I would have bass well below 20 Hz. (like 15 Hz.) before my -3 point - would it really, or would the woofer not be able to do it (in a small bedroom)?
     
  2. BlakeN

    BlakeN Stunt Coordinator

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    I am at work so I can't run the numbers but I would look at your linear excursion. I would guess that you will be going beyond 10mm and bottoming out that driver.

    I would Highly suggest you look at this sub its $20 more but well worth it.


    Atlas 15"

    Here is the graph of what it will do in a ported enclosure.
    http://www.ascendantaudio.com/archiv...0Q%20graph.htm

    Its discontinued though so order quick if you want one.

    Your also going to need more then one port 2 at the least 3 would be better.
     
  3. Jack Keck

    Jack Keck Second Unit

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    I used all the same stuff in a box that's between 5.5 & 6 cubic feet. I left the port full length. I chose the amp because it was on sale. The plan was for the 240 watt amp. I'm glad I bought what I did because I used the parametric equalizer to boost the lowest frequencies. I hope you enjoy your sub as much as I do mine.

    I hope you have a RAdion Shack meter and some test tones. They'll come in real handy. Be gentle with the gain control.
     
  4. Kenneth Harden

    Kenneth Harden Screenwriter

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    I am just playing - problem is, I have no woodworking tools [​IMG]

    I have a router, and would gladly buy a Jasper Jig, but then I would have to buy a table saw, and it would get a bit spendy.

    Someday...
     
  5. Mark--M

    Mark--M Stunt Coordinator

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    According to unibox, the driver will be reaching 15mm excursion at around 30 hz. Even 250w will put it past the 10mm excursion limit.

    A 250W amp and a 7cu.ft. box tuned to 22Hz would probably work ok.
     
  6. Jack Keck

    Jack Keck Second Unit

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    Quoth Kenneth:

    "I am just playing - problem is, I have no woodworking tools

    I have a router, and would gladly buy a Jasper Jig, but then I would have to buy a table saw, and it would get a bit spendy."

    I paid $12.50 for my table saw.[​IMG] OK, I had the lumberyard cut the panels for me. I used a jigsaw for the speaker and port cut-outs, and a circular saw for the amp opening. I also had to trim the sides, but that's another story altogether.:b

    PE recommends a 5.5 cubic foot box. I messed with WinISD and this seemed the most feasable to me. I was able to cut all six sides and braces from one 4' X 8' piece of mdf. This was important because the amp. although I got it for $197.00 before Xmas, wa sa large cost overrun. Of course, if you figure that I would have needed a BFD or similar equalizer, then it saved me a few bucks.[​IMG]
     
  7. Wes

    Wes Screenwriter

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    Location:
    Utah USA
    Real Name:
    Wes Peterson
    Here is my Quatro box, well boxes!http://prosteering.8k.com/custom4.html

    I first tried a longer port but I hated the sound. I love a good solid punch for music and still have plenty low end for HT which I achieved with these babies!

    I am running one Rythmic 350w amp running at 8ohm so about 250ish watts. I never bottom out and can run the full 350w with no problems.

    Wes
     

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