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new IB response curve, uncorrected, no EQ

Discussion in 'Home Theater Projects' started by Rich Kraus, Feb 24, 2005.

  1. Rich Kraus

    Rich Kraus Stunt Coordinator

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    I left the response curve picture full size to preserve the detail, the link is below.

    [​IMG]

    method:

    burned sine tones from NCH generator, 1Hz steps, 1-85Hz.

    red line is 70dB/60Hz baseline.

    utilized radio shack analog dB meter (stock)

    played tones in 1 hz steps, starting at 85hz working down (allowing 10 min cooldown after each 10 steps, just to be careful) and charted results in 1Hz steps.

    note that after baseline was set meter was moved to new location, and left for duration of test, hence -5dB reading at 60Hz.

    results here

    i have suspicisions the null at 67hz may be due to meter placement, i may retest another day when i have more time.
     
  2. GrahamT

    GrahamT Supporting Actor

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    Hi Rich,

    The IB looks good. I assume those are some Stryke drivers right?

    I cant really make out that graph. If you want to you can throw them into this Excel worksheet:

    http://www.snapbug.ws/subtestmodel.xls
     
  3. Rich Kraus

    Rich Kraus Stunt Coordinator

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    similar to the strikes.

    they are TC Sounds TC2+ 15"'s

    believe it or not i dont have excel installed on this machine. i think i may have it on the one in the other room, but my SO is doing homework on that one right now (do not disturb [​IMG] )

    basically the graph is one HZ/one dB step per square. 85hz on the right, with divisions on the red line every 5hz.
     
  4. Bryan Michael

    Bryan Michael Supporting Actor

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    whats the differance between them and the stryke?
     
  5. Rich Kraus

    Rich Kraus Stunt Coordinator

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    the strike drivers are still available [​IMG]

    theres a couple mm difrence in the xmax, and a couple other minor diffrences in the other T/S's

    there pretty close...
     
  6. Jason Dalton

    Jason Dalton Stunt Coordinator

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    With meter corrections, that response will be flat down to the limits of your measurement (13Hz). Very nice!

    Now see how loud you can get it to play at 10Hz. [​IMG]
     
  7. Ben Ven

    Ben Ven Stunt Coordinator

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    Nice work!
     
  8. Rich Kraus

    Rich Kraus Stunt Coordinator

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    chris white over at HTT was kind enough to adjust my figures (corrected for the RS meter) and turn them into a more readable plot:

    [​IMG]

    Some stats (corrected values):
    average = 67.9
    std deviation = 3.28

    thanks chris..
     

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