My pants flapped

Discussion in 'Archived Threads 2001-2004' started by ScottAndrew, Apr 15, 2002.

  1. ScottAndrew

    ScottAndrew Stunt Coordinator

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    I always thought that was a figure of speech. But I was sitting about four feet from my VTF-2 watching Iron Monkey at 8dB below reference, and my pant legs flapped around during one of the louder scenes. That is extremely cool.

    SA
     
  2. Dustin B

    Dustin B Producer

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    Hehe, I experienced the next step to that feeling yesterday. It's fun.
    I just finished building two subs. One for my parents and one for my roommate. Playing the Matrix helicopter explosion at 5dB under reference with the sub 3-4dB hot in a 10'x12' room (sitting about 6' from the sub). I've never heard a sub as capable as these in a room this small before. Didn't just get the pant leg flap, got the my pant legs, entire shirt and my hair flap, along with a vibrating bed :p)
     
  3. Kenny Booth

    Kenny Booth Stunt Coordinator

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    Scott,

    What do you think caused you pants to flap. Did the floor shake? Chair shake? Airborne acoustic waves?
     
  4. Matt Meyer

    Matt Meyer Stunt Coordinator

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    Try "Titan AE" it has the most unreal LFE track. It just goes on and on. Your pant leg won't be the only thing flapping.[​IMG]
    Matt
     
  5. ScottAndrew

    ScottAndrew Stunt Coordinator

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    It felt like a little tiny gust of wind going past my leg.
     
  6. Greg_R

    Greg_R Screenwriter

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    Air flow from the ports of various ported designs can go across an entire room. Check out the Aerial SW12 if you like the leaf blower effect...
     
  7. Dustin B

    Dustin B Producer

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    If the air flow out of a port even comes remotely close to that of a leaf blower the port is way too narrow.

    The port on the sub I mentioned above is on the top of the sub, just over 3' off the ground, pointed at the roof and I still got the clothing flap effect.

    We represent sound as wave patterns on graphs, but really that's just a represenation of high and low air pressure over time. When the pressure differences become large enough, they can move things, like the cuff on your pants.
     
  8. Holadem

    Holadem Lead Actor

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    I have definitely felt my pants flap in a THX theater before (during the Matrix actually, IIRC), and that had nothing to do with the port. Cool feeling.

    --

    Holadem
     
  9. Greg_R

    Greg_R Screenwriter

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    Dustin,

    I agree about the underporting. IMO, that's one of the big differences between a (proper) DIY ported design and most commercial ones...
     
  10. Bob_L

    Bob_L Supporting Actor

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  11. Chris Tsutsui

    Chris Tsutsui Screenwriter

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    In my car with dual tens during a bass test I get the hair moving effect. Air moves across the head board and blows on our hair.

    I used to think that it's about the back massage effect but I like the hair blowing effect. I wonder what it would be like to cover a port with my ear and let her rip.
     
  12. Cam S

    Cam S Screenwriter

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    YA Chris, try it and let us know the results!! [​IMG]
     
  13. Arnel

    Arnel Agent

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    Nice experience but what and how many subwoofers are you using?

     
  14. Tim Hoover

    Tim Hoover Screenwriter

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    Ain't pants-flapping just one of the greatest things ever! I get a childlike glee everytime it happens [​IMG]
    In a (sort of) related story, our bass player recently got a new bass rig. Mind you, I'm playing drums so there's not a whole lot that can faze me. At our first practice with the new system, the force actually pushed me back! The blinds on the window behind me were violently, and I mean VIOLENTLY, flapping in the wind. It'll be a great thing to use live...
     
  15. Ryan T

    Ryan T Second Unit

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    I have had my pants flap with my new DIY sub. It's sealed so I know it was not the port. I have a tiny room and a big sub so I can get my pants to flap with my wimpy 75 Watt amp. I can't wait till I get a better amp.

    Ryan
     
  16. Mike Strassburg

    Mike Strassburg Second Unit

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    My Klipsch KLF-30's with dual 12's will make my pants flap. Tomorrow when I finally get to fire up my dual Tempest sonosub I'm hoping my fillings fall out.... [​IMG]
     
  17. DavidAM

    DavidAM Second Unit

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    I like when the sub gives me the pickle tickle myself [​IMG]
     
  18. Brett DiMichele

    Brett DiMichele Producer

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    The answer to anything moving from low frequencies is simple.
    You are moving large volumes of air.. Granted it's not like
    a concentrated jet from a leaf blower but you are distributing
    the air. Low frequency sound travels many times further in
    the open air than High Frequency and this is why you can hear
    a loud car stereo 3 or 5 cars ahead of you.. Or some times
    even MILES away. (Especialy on a cold night when the air is
    more dense)
    I can hear the trains 10 miles away on cold nights. Can't
    hear them when it's warm. [​IMG]
    So if you want more Low Frequency in your home theater keep
    it chilled! LOL
     

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