It's official...

Discussion in 'Archived Threads 2001-2004' started by Isaac C, Sep 20, 2001.

  1. Isaac C

    Isaac C Stunt Coordinator

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    .... I'm now a member of the club of Shiva sub. owners! [​IMG] I say it's about time!! Actually, this would have been my 2nd Shiva sub had I found out earlier that Shiva was going to be available locally (I bought 2 elcheapo Pioneer "car" subs just before Shiva became available here). John Woodhead of Acoustic Concepts here in Australia was most accommodating and patient with me and my questions [​IMG]
    Only one Shiva for now, more to come later [​IMG] It'll be used for both explosive movies [​IMG] and music. I plan to tune it to 18Hz with a net enclosure volume of 180l (6.4ft^3). Although I might have a slight problem with the vent being too long for a vent diameter of 6".
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    [Edited last by Isaac C on September 20, 2001 at 11:48 AM]
     
  2. Isaac C

    Isaac C Stunt Coordinator

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    [​IMG]
    I suppose 180l is rather large. I haven't done any iterations of enclosure dimensions, but a quick vent calc. yields a required vent length of 42" for a 6" diameter vent with an 18Hz, 142l enclosure.
    Making the internal box dimensions 48" high (to give the 42in-long vent some room to breath) with 15" square ends, gives a net volume of about 154l (or 5.4ft^3)... I think [​IMG]
    What do you guys think?
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  3. Brian_E

    Brian_E Auditioning

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    Hi, Isaac
    Welcome to the club! [​IMG] I'm also a recent member as I just finished up my Shiva based sonosub.
    I'm just curious, is there a reason for sticking with the 6" diameter? I know there's been massive discussion regarding port size and compression characteristics, and I'm by no means an expert. However, I've learned almost everything I know on the topic from many of the experts on this this very forum.
    It seems that a Shiva with dual flared 3" ports is more than adequate in 99% of all situations. I've found that a 4" x 23" straight port (well, poor-man flaired) for an approx. 18Hz tune works quite well up to a couple hundred watts also.
    Oh, and I second what Jack said. I couldn't imagine building a Shiva sub larger than the recommended EBS enclosure size. I'm VERY happy with my ~110L/18Hz alignment.
    Just my $.02
     
  4. Patrick Sun

    Patrick Sun Moderator
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    If you haven't built it yet, I'd go with a flared 4" wide port (simulate using 4" wide port, add 1" to the final end-to-end length to account for the flared ends) and you'll get shorter port length (than using a 6" wide port), and your vent mach won't make much difference going with the flared vent. This will cut down on the height of the sub, and you can get by with a little little on the internal volume of the enclosure.
    [Edited last by Patrick Sun on September 20, 2001 at 05:02 PM]
     
  5. Jack Gilvey

    Jack Gilvey Producer

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  6. Isaac C

    Isaac C Stunt Coordinator

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    I haven't built it yet, luckily we don't have school for 2 weeks starting next week, so this sub should be finished within that much time.
    I'd use flared ports if only I could find one with enough flare radius. I suppose I could use a 4" pipe with flared ends made out of modeling foam. Anyone happen to know the flare radius of the Adire Audio FP-4 port kit?
    I've just received a reply from a local construction company, http://www.boral.com.au/index.htm
    .... some more details of the completed amp and yet-to-be-boxed active crossover circuit in http://www.geocities.com/f4ier/elec.htm
    Isaac
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    [Edited last by Isaac C on September 21, 2001 at 07:32 AM]
    [Edited last by Isaac C on September 21, 2001 at 07:33 AM]
     

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