Can the shiva go LOUD & LOW

Discussion in 'Archived Threads 2001-2004' started by Tyler, May 27, 2001.

  1. Tyler

    Tyler Stunt Coordinator

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    Can the shiva subwoofer go as loud as a Theater sub in the cinemas ?
    in a 17 foot by 15 foot room ?
     
  2. kevin oswald

    kevin oswald Agent

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    You should have no problems reaching reference levels..
     
  3. Jack Gilvey

    Jack Gilvey Producer

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    I don't think that there's any 12" driver which will give "reference" levels in anything but a car, if by "theater levels" you mean 120db down to 20Hz.
     
  4. Julian Data

    Julian Data Second Unit

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    I agree with Jack here, it's going to take more than one 12" driver.
    ------------------
     
  5. Greg Monfort

    Greg Monfort Supporting Actor

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    >Can the shiva subwoofer go as loud as a Theater sub in the cinemas ?
    in a 17 foot by 15 foot room ?
    ====
    Not even close. Cinema subs are high efficiency/high power handling, don't go very low, and are stacked/EQ'd to get a solid response to 30Hz. A single JBL sub will average 116dB/rated power in 10kft^3 from 35-120Hz, so it's 1m limit is much higher. HIFI sub drivers OTOH trade efficiency to get the bottom octave.
    ====
    >You should have no problems reaching reference levels..
    ====
    With a single Shiva, you would have to sit ~a meter from it.
    ====
    >.......if by "theater levels" you mean 120db down to 20Hz.
    ====
    Theaters now have similar reference levels as HT, 115dB average in a reverberant sound field, though few have much energy below 30Hz.
    GM
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    Loud is beautiful, if it's clean
     
  6. Jack Gilvey

    Jack Gilvey Producer

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    Ahh. That does bring up a question. When referring to "reference levels" in a ht environment, over what bandwidth is this 115-120db required?
     
  7. Greg Monfort

    Greg Monfort Supporting Actor

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    The LFE chnl should be 10dB above a single main chnl 20-80Hz (-3dB) which should be 105dB peaks/listening position/20-20kHz (-3dB). If the mains can't do this, then use bass management and add 6dB to the LFE chnl according to Holman Tomlinson, or 121dB peaks/listening position, though other data at the DD website implies that 130dB peaks/listening position would be needed. This means a serious, or serious^2 [​IMG], sub if you sit 3-4m away.
    GM
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    Loud is beautiful, if it's clean
     
  8. Tyler

    Tyler Stunt Coordinator

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    Thanks for the help.
    So must theater subs can only go down to about 30hz ?
    Yes it seems that way when ever i go se a movie the bass is loud and hits dramaticly & sure can rumble.
     
  9. Greg Monfort

    Greg Monfort Supporting Actor

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    Unless the theater adds some infrasonic bandpass subs, ~30Hz is it. What you get is tremendous slam in the 60-120Hz BW. Up close, a JBL pro dual 18" sub will rock you back on your heels when you pot it with 800W. [​IMG]
    GM
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    Loud is beautiful, if it's clean
     
  10. Seungsoo Hwang

    Seungsoo Hwang Stunt Coordinator

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    Greg or anyone that knows, when a theater says it is "thx somethingorother" does it have to play down to a certain level/volume basswize? A lot of screens here are pushing their THX-ness...
     
  11. Julian Data

    Julian Data Second Unit

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    Most "THX" theaters I have been to around here in NW PA.. BLOW!
    Back home in VA they aren't bad.
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  12. Ben Yang

    Ben Yang Extra

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    I agree with Julian. Most theatres do NOT go as low as a decent home theatre, eventhough they can be very loud. Just saw "knight's tale" in a new digital theatre which boasts state of the art sound and picture, leather stadium seating, beer / wine, real food. Called the club theater at the General cinema in Washington DC. Great seats, great picture, excellent sound quality, but not sure if I heard ANYTHING near 30hz. Deepest bass I could tell was in the 50's. Could be the picture itself, but the sound effects were pretty amazing. My shiva goes very deep and low, even better now that I corrected the phase.
     
  13. Greg Monfort

    Greg Monfort Supporting Actor

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    THX sets dispersion patterns, etc.. Frequency response/loudness is Dolby. Dolby SR-D is 20-20kHz (-3dB), and I imagine very few theaters are setup to do it as it's very costly equipment wise, and requires the theater to be be a stand alone building.
    GM
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    Loud is beautiful, if it's clean
     
  14. Julian Data

    Julian Data Second Unit

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  15. Shade Watson

    Shade Watson Stunt Coordinator

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    Julian,
    The Intro to the Mini-Mammouth states that it is inferior to any other subwoofer. Who would want that?!
     
  16. Greg Monfort

    Greg Monfort Supporting Actor

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    These remind me of the units used at some amusement parks. I liked the big subs bolted to the floor for "Earthquake!".
    GM
    ------------------
    Loud is beautiful, if it's clean
     
  17. Julian Data

    Julian Data Second Unit

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    Shade,
    I was just referring to the motion simulator. [​IMG]
    I haven't read anything about their sub.
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  18. Shade Watson

    Shade Watson Stunt Coordinator

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    Julian,
    I was just making a joke about their misprint. I'm sure they meant superior rather than inferior.
     
  19. Julian Data

    Julian Data Second Unit

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    Shade,
    np.
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