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AV-12 MKII, 3 cu-ft PR thunder or EBS?

Discussion in 'Home Theater Projects' started by Sebastian, Jan 8, 2004.

  1. Sebastian

    Sebastian Second Unit

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    I am thinking on building one of these enclosure for the AV-12 MKII. What are the pros and cons of each alignment?
    any first hand experience would be helpful.
    Thanks.
     
  2. ThomasW

    ThomasW Cinematographer

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    EBS of course give the higher output at lowest frequencies. That's what they're designed to do.

    PR's allow a smaller box. They too can be tuned quite low.

    For a freestanding box I prefer ported over PR's. To my ears the inner details of PR based subs aren't as clear/accurate as a true ported design.

    I used to have a link to a website where a study was done using a Peerless XLS driver in both ported and PR based cabinets. They compared transient response plots of each design. It was pretty obvious from the plots that the PR had more 'ringing' and 'overshoot' compared to the standard port.

    Unfortunately I've lost the link...... [​IMG]

    Note if this is your first DIY sub, you won't be disappointed with either design.

    Regards
    Thomas
     
  3. Sebastian

    Sebastian Second Unit

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    Thanks Thomas,
    I will save a little money then and go with the EBS alignment. Space is not a concern. I will be replacing my DIY 5 cu-ft sonosub using an SVS original driver.
     
  4. Troy R

    Troy R Stunt Coordinator

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    Sebastian,

    What are the design details of that SVS sub you have? I bought an old SVS driver and am trying to model something. I would like to make a sub similar to SVS 20-39, but I can't get a design I like. Also, how many watts are you running it with?

    Any info would be great!

    Thanks!
     
  5. Sebastian

    Sebastian Second Unit

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    Troy,
    Here is a thread with the specs. The links no longer work but I could e-mail you the in room response if you like?

    SVS driver
     
  6. Troy R

    Troy R Stunt Coordinator

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    Thanks Sebastian!

    How many watts were you using?
     
  7. Sebastian

    Sebastian Second Unit

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    No problem, good luck!
    250W PE plate amp with no bass boost. More than enough power for this driver.
     
  8. Troy R

    Troy R Stunt Coordinator

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    You didn't have any problems with exceeding xmax or port noise with your design?

    Sorry for the thread hijack! [​IMG]

    Thanks again!
     
  9. Sebastian

    Sebastian Second Unit

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    The only DVD so far was ATOC when the senators ship explodes, "fly by scene" about 7 dB below ref.
    I have not tried the other big bass movies like the haunting. TS2 and Monster inc no issues but I really never drive this subwoofer that hard. I have a little one sleeping usually.
    No port noise that I could tell. The port I used is identical with the one SVS uses, heavily flared. I am pretty sure a 4" flared port is more than adequate for this driver.
    I think with this driver at high volumes and the right DVD you can bottom this driver with no problem.
    Here is another link with an excursion graph for SVS original driver
    SVS excursion
     
  10. Troy R

    Troy R Stunt Coordinator

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    Do you think I could I get away with non flared ports of PVC? I was thinking maybe two 4", or three 3" ports of PVC? If I went that route I would probably make a flare in the MDF with a router on the outside.
     
  11. ThomasW

    ThomasW Cinematographer

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    Used 4" flared or a 6 " straight if there's enough space..... :wink:
     
  12. Troy R

    Troy R Stunt Coordinator

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    How much space do I need to leave between the end of the port and the driver?
     
  13. ThomasW

    ThomasW Cinematographer

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    A distance at least equal to the diameter of the port. The greater the distance the better.
     
  14. Troy R

    Troy R Stunt Coordinator

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    hmmmm, I wonder if the wife will object to a 55" tube in the apartment? [​IMG]

    Thanks for all the help guys!
     
  15. Sebastian

    Sebastian Second Unit

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    Yeah, no problem Troy and thanks for hi-jacking my thread, J/k[​IMG]
     

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