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New sub, anyone care to help with the box design?

Discussion in 'Archived Threads 2001-2004' started by BrendanL, Sep 24, 2002.

  1. BrendanL

    BrendanL Active Member

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    I just got an Earthquake Magma 15" sub, and they aren't much help for a decent box design. I am going to use this sub in my home theater, so I want to design a box that will play low and still have decent midbass output.
    The specs on it are:
    FS: 24.7 Hz
    BL: 10.4741 tm
    SPL: 90.6 dB
    QMS: 8.0864
    QES: 0.4767
    VAS: 235.33 Liters
    MMS: 197.91 Grams
    VC = 3"
    xmax =" .98"
    They suggest using their passive radiator but thats more money I don't have and I don't mind a huge PVC or slot port.
    More specs and their suggested designs are here:
    http://www.earthquakesound.com/box%2...gma15/hex1.gif
     
  2. without a bunch of EQing, you are looking at a pretty large enclosure


    320L tunned to 20hz with a 6"x12.25" port should do it for you.


    I don't see how this driver can be used in their recommended 2.5ft^box without tons of EQing!
     
  3. Chris Eriksen

    Chris Eriksen Well-Known Member

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    Hi Brendan,
    Nice choice for a driver - I use the same sub. [​IMG] My Magma 15 is in a 225L vented enclosure, tuned to 16 hz. I am feeding it in excess of 600rms, and I am very happy with the results. Many people here on HTF helped to design my enclosure - you can read their input HERE.
    Two other quick thoughts:
    -I would not recommend cloning the Supernova 15. I have had the opportunity to demo this sub head-to-head with my DIY sub, with my DIY version being clearly superior in every aspect except enclosure size. [​IMG]
    -The Magma 15 can be mounted in a down-firing enclosure. I ran the numbers when designing my sonosub, and the cone sag was acceptable in a down-firing orientation.
    I hope this helps! [​IMG]
     
  4. BrendanL

    BrendanL Active Member

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    I couldn't pass it up for $100 new in the box. [​IMG]
    Chris,
    Did you make a sonosub? What size port did you use?
    I guess I need to hunt down some sonotube, because otherwise I will have a 150 pound+ enclosure.
     
  5. Chris Eriksen

    Chris Eriksen Well-Known Member

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    Hi Brendan,
    Wow! That sub is a steal at $100. I'm jealous.
    For my sonosub, I used a 33" long port with the equivalent area of a 6" diameter port. Keep in mind that the displacement of the port is very significant. 225L is the net size of my enclosure, after subtracting the volumes of the port, driver, and bracing.
    I hope this helps! [​IMG]
    -Chris
     

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