My *perfect* sub would be able to produce...

Discussion in 'Archived Threads 2001-2004' started by John H, Jan 19, 2002.

  1. John H

    John H Second Unit

    Joined:
    Nov 27, 1998
    Messages:
    473
    Likes Received:
    0
    I copied this out of a HTF thread and saved it a couple of years back but did not print out the authors name.
    "My *perfect* sub would be able to produce...
    140dB-16Hz and up. (cleanly-1m distance, corner loaded).
    I would attempt to EQ the response to be something like...
    16Hz - +30dB
    20Hz - +24dB
    25Hz - +18dB
    31Hz - +12dB
    40Hz - +6dB
    50Hz - +3dB
    flat the rest of the way.
    This curve would compensate for the human hearing natural rolloff."

    What are others opinions on this? Would anyone like to authorize this?
    John
     
  2. Steve Zimmerman

    Steve Zimmerman Second Unit

    Joined:
    Dec 6, 2001
    Messages:
    349
    Likes Received:
    0
    That sounds totally ridiculous to me and if I had said it I would bury my computer in shame.

    The LFE channel *clearly* accounts for human hearing response by increasing the dB output of low frequencies. If you tried to watch a movie like Phantom Menace using the "ideal sub" depicted in your post it would be intolerable and frankly dangerous.

    --Steve
     
  3. Jeffrey Noel

    Jeffrey Noel Screenwriter

    Joined:
    Sep 11, 2001
    Messages:
    1,541
    Likes Received:
    0
    140 dB???? Holy crap! That does seem ridiculous to me. I'm sure that 140dB at 16hz would give you one helluva colon-cleansin' though. [​IMG] I guess everyone's taste is a little different.
     
  4. EarlR

    EarlR Stunt Coordinator

    Joined:
    May 13, 2001
    Messages:
    71
    Likes Received:
    0
    140DB at 16 Hz would most likely make you physically ill as well as damaging your hearing.

    Earl
     
  5. Lewis Besze

    Lewis Besze Producer

    Joined:
    Jul 28, 1999
    Messages:
    3,134
    Likes Received:
    0
     
  6. John H

    John H Second Unit

    Joined:
    Nov 27, 1998
    Messages:
    473
    Likes Received:
    0
    Capable of producing 140dB @ 16Hz cleanly measured at 1 meter distance.
    How would that translate at the listening position?
    If using bass management to route low freqencies from other channels to the subwoofer along with the LFE channel. Reference level bass is 121dB/21-24Hz of clean output at the seats according to the SVS site.
    John
     
  7. Sean Conklin

    Sean Conklin Screenwriter

    Joined:
    Oct 30, 2000
    Messages:
    1,721
    Likes Received:
    0
    Can you say "Flatliners", Clear! Zaaaaap!

    I know there is a certain hertz and db level that can actually stop your heart, I don't know if this would be enough, but wouldn't be too far off.
     
  8. Tom Vodhanel

    Tom Vodhanel Cinematographer

    Joined:
    Sep 4, 1998
    Messages:
    2,215
    Likes Received:
    8
    that sounds familiar...but I may have taken the EQing about 3x to far[​IMG]
    I was heavy into digital bass synthing at the time...and John knows how much headroom that eats. I would guess in a typical room and seating layout...you can expect the seats to be anywhere from 3 to 9dB under the 1m figure(that's rough).
    You also have to remember...at the time(2-3 years ago?)...the LFE on DVDs wasn't pushed like it is now. Finding something with peaks
     
  9. Glen_L

    Glen_L Stunt Coordinator

    Joined:
    Sep 10, 2000
    Messages:
    86
    Likes Received:
    0
    Wouldn't room gain (depending on the dimensions) somewhat make up for the ear's low frequency roll-off?
     

Share This Page