DPL vs Shiva dilemma

Discussion in 'Home Theater Projects' started by brentl, Dec 8, 2004.

  1. brentl

    brentl Cinematographer

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    I ordered and received my Shiva tube kit from Creative sound in Vancouver today but I received a DPL12 in the box instead of the Shiva.

    I know people would say "look, you just got a better sub for less money" , well I'm not worried about that, I'm more worried about how this will sound in the same enclosure with the same port length ETC ETC...

    Could somebody do a quick model for me please(no EQ)?? I'm worried about not getting the "kick in the ass" feeling I want with the lower Xmax!

    Thanks
    Brent
     
  2. ThomasW

    ThomasW Cinematographer

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    A ported box is tuned to a specific frequency, not to a specific driver.

    The DPL-12 has better low-end than a Shiva. Don't sweat it.

    However if you wanted "kick-in-the-ass" performance, you should have chosen a MUCH bigger box and MUCH higher excursion driver to begin with ..............
     
  3. brentl

    brentl Cinematographer

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    It's also 3 DBs less efficient and has 3 mill less excursion. It makes 2 channel power amp looks like a wimpy 62.5WPC amp!!

    Like I said I want to get "kicked in the ass", and I'm afraid I'll need to get more amp power. If I thought that, I would have bought something else!

    I understand that it may be better in the low end but I wonder how it models to that exact tube/port length.

    Brent

    "However if you wanted "kick-in-the-ass" performance, you should have chosen a MUCH bigger box and MUCH higher excursion driver to begin with" If this compares to a Paradigm PW2200 I'll be very happy!
     
  4. brentl

    brentl Cinematographer

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    After a little bit more reading I've also found that the DPL12 also has a fair bit of sag when oriented horizontally.

    Around 6.5% from what i've read, which is considered unacceptable for a sub in a downfiring location(so I've read).

    Brent
     
  5. DanWiggins

    DanWiggins Second Unit

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    Brent,

    Rated efficiency is meaningless for subwoofers. The box dominates the efficiency of the system down deep. And that 1.5mm difference in one way linear excursion amounts to around 0.4-0.5 dB SPL difference (not an audible or noticable difference).

    HOWEVER, the DPL12 will play lower, and will also have less power compression (larger voice coil). And it's suspension is a bit more linear and extended throw as well (larger diameter spider).

    They work fine down-firing. We've used them that way hundreds of times.

    Overall, I'd say you got a free upgrade to a better, beefier driver.

    Dan Wiggins
    Adire Audio
     
  6. brentl

    brentl Cinematographer

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    OK Dan thanks for your help.

    Looks like I'll keep it, hey the rest of it is built already.

    This package is truly a great deal made even better by the (possibly accidental) upgrade.

    If I come in to some extra bucks I may get some more amp power for this, do you know the max power handling in this configuration?

    Brent
    Running a dedicated 125 watts to each VC right now!
     
  7. michael.e

    michael.e Extra

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    With a low tuning,you wont require the drivers full RMS rating to reach excursion limit.Probably a hundred watts or two hundred,but youl want headroom so that your amplifier doesnt clip.

    Dont know tuning nor box volume so cant comment on specifics in this case.
     

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