Sub Calibration...Quick Question

Discussion in 'Speakers' started by Mark Danner, Mar 24, 2005.

  1. Mark Danner

    Mark Danner Stunt Coordinator

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    I tried searching but didnt see anything that specifically answered my question.

    I have calibrated with the rat shack meter and DVE. Now I want to plot my subs response on a chart. Do I play the test tones at ref (0) or do I play them at the normal level that I would listen to a movie (-15). I started at ref level and man it feels like I am in the ring with Tyson. The sub is a PB12-isd/2. So I am guessing that I need to turn it down a tad bit. No bad noises were heard like bottoming out so the sub handled it okay. Granted the test tones that I played I paused after about 4 seconds because it was shaking the whole neighborhood. Dogs started barking like 4 doors down from me. hehe

    Oh the sub is factory tuned so I have not changed that and here are the results of what I tested. I didnt go too far because it was soooo loud. Below are the corrected values from my SPL meter.
    89.0 - 16 hz
    92.5 - 18
    98.5 - 20
    101.5 - 22
    100.0 - 25
    104.0 - 28
    106.0 - 31.5
    107.5 - 36
     
  2. Greg Bright

    Greg Bright Second Unit

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    Normally calibration is done at 70-80dB. Playing test tones at high volumes can cause permanent damage to: ears, fine china, house foundations, subwoofers.
     
  3. Brian Fellmeth

    Brian Fellmeth Supporting Actor

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    Don't be surprized if the curve comes out very uneven. Thats not your sub, thats your room. If you want to fix it, enter the wonderful world of the BFD.








    b
     
  4. WayneO

    WayneO Supporting Actor

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    You've got that entirely too loud to be testing with sine waves. Usually most will start at 80hz-100hz with the 1/12th octave tones and go downwards. I start at 80hz, adjust volume to 80dB and then go from there, you should get much higher than 85dB unless you have a real nasty peak.
     
  5. ChrisWiggles

    ChrisWiggles Producer

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    Enter the even more wonderful world of room acoustics. Bass treatment is always helpful, and is a more thorough solution when used in conjunction with EQ like a BFD, because EQ alone cannot fix certain frequency response problems, nor time domeain problems.
     
  6. David Bikeman

    David Bikeman Stunt Coordinator

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    "Enter the even more wonderful world of room acoustics. Bass treatment is always helpful, and is a more thorough solution when used in conjunction with EQ like a BFD, because EQ alone cannot fix certain frequency response problems, nor time domeain problems."

    Chris, you married? [​IMG]
    My HT is in my livingroom and SWMBO says I can have the bass treatments after the divorce. Of course, after the divorce I won't be able to afford bass treatments so I guess it ain't gonna happen. But that's great advice for the "lucky" ones.

    David
     

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