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sub woofer calb.

Discussion in 'Archived Threads 2001-2004' started by gene avallon, Jan 11, 2002.

  1. gene avallon

    gene avallon Stunt Coordinator

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    I guess I belong over here. Ihave the art set up to pratice before I get the two plus. the art is set at hi pass 12,low pass 10K,level 8, 63 band -6db,32 band +5db.

    Hz correct

    20 55 62.5

    22 59

    25 67 73

    28 75

    31 82 85

    36 81

    40 85 87.5

    45 84

    50 94 95.5

    56 92

    63 90 91.5

    71 92

    80 90 91.5

    89 89

    100 84 86

    112 89

    125 86 86.5

    im not sure how to correct the other numbers.do you always want it to go from 20Hz to125Hz? Is it still to loud? ron dosent want me to blow up the new 46 pluses.

    IM BACK and little more smarter

    gene
     
  2. Tom Vodhanel

    Tom Vodhanel Cinematographer

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    Hi Gene,

    what are you measuring...do you have the art hooked up to a subwoofer right now?

    TV
     
  3. gene avallon

    gene avallon Stunt Coordinator

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    tom

    yes those are the db readings from the stryke disk,what are the recomendations for the settings on the art to smooth this out.im just practicing for the real thing to come.

    gene
     
  4. Wayne A. Pflughaupt

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    Gene,

    Hopefully you can see from your old and new readings what a difference an equalizer can make. For the record, here are your old 1/6-octave readings:

    20 72

    22 76

    25 80

    28 85

    32 90

    36 91

    40 95

    45 96

    50 105

    56 105

    63 106

    71 106

    80 102

    89 98

    100 100

    112 100

    126 100

    The new readings show some improvement, but not as much as I had hoped. The 5dB differential between 40 and 32Hz has been reduced by 2.5dB, a 50% improvement. The 10dB gap between 50Hz and 40Hz has been reduced by 3dB, a little better. The 4dB differential between 63Hz and 80Hz has been eliminated.

    However, these readings also show that there are some things an equalizer simply cannot address. For instance, both sets of readings reveal a “stair-step” response with a severe and sudden drop between 50 and 45Hz. Note that with both readings, above and below that point response is relatively smooth – a gradual and consistent drop on both sides of the “step.”

    Probably, Gene, this is a function of this particular sub, and not the room. This would be a very bizarre room-induced problem. Hopefully this “stepped” response will not be there with the new subs.

    In the mean time, try cutting the 50Hz band by 2dB and changing the 32hz band to +7dB. This will not eliminate the 50-45Hz hole, but it will smooth everything else out a little more. With music you should be able to readily tell the difference between equalized and unequalized. However, please note that with the equalizer engaged you will need to turn up the sub’s volume (to compensate for the 63Hz cut).

    By the way, you should be taking these readings with the mains off. And the mains should be set to “small.”

    Also, do you know what the crossover setting is?

    Regarding correction in between the know figures, just look at the number above and below and calculate the difference to the nearest ½ dB. For instance, for both 63 and 80Hz the correction is 1.5dB, so add the same 1.5dB for 71Hz. Note there is a considerable gap between 30Hz (3dB) and 25Hz (6dB) corrections. In this case there is a 3dB difference between the two, so factor half that (1.5dB, or 4.5dB total) to the 28Hz reading. Make sense?

    Regards,

    Wayne A. Pflughaupt
     
  5. gene avallon

    gene avallon Stunt Coordinator

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    wayne
    Hz db
    20 63.5
    22 62
    25 74
    28 78.5
    31 90
    36 85.5
    40 90.5
    45 87
    50 94.5
    56 92.5
    63 90.5
    71 91.5
    80 91.5
    89 88.5
    100 86
    112 88
    125 86.5
    speakers set to small,mains off,crossover on back off set at 160 they say thats off
    gene[​IMG]
     
  6. Wayne A. Pflughaupt

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    That’s probably as good as we’re going to get with these subs, Gene. Does it sound any better?

    Regards,

    Wayne A. Pflughaupt
     
  7. gene avallon

    gene avallon Stunt Coordinator

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    I dont know yet havent given them a run yet.they never sounded good.I want to thank you very much,now im ready for the real thing.have you noticed that the shift key is working better,all it needed was a little brain oil.
    GENE[​IMG]
     
  8. Wayne A. Pflughaupt

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  9. gene avallon

    gene avallon Stunt Coordinator

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    we bear our crosses.
    love ya
    gene
    [​IMG] [​IMG] :b
     
  10. Wayne A. Pflughaupt

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    Yes we do! [​IMG]
     
  11. gene avallon

    gene avallon Stunt Coordinator

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    wayne
    your a good sport,woudlnt min to have you as a nebihor.the sub sounds much better,im not always playing with the sub volume control like before.
    alls well that ends well.
    see you when the avs subs get here
    gene
    im bent over from my crosses.[​IMG]
     

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