crossover point

Discussion in 'Archived Threads 2001-2004' started by Cire, Oct 9, 2002.

  1. Cire

    Cire Stunt Coordinator

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    looking at the frequency response of a speaker system (including sub), which would reflect better properties?

    a. sub and channels meeting at 180hz at 0db
    b. sub and channels meeting at 100hz at -3db
    b. sub and channels meeting at 80hz at -5db
     
  2. Bill Kane

    Bill Kane Screenwriter

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    Crossover? For one, the THX default standard is 80Hz.

    Where do you get these dB or "X-order" slope figures. It's hard to understand, at least for me, what is the context.
     
  3. Cire

    Cire Stunt Coordinator

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    quote:
    Where do you get these dB or "X-order" slope figures. It's hard to understand, at least for me, what is the context.
    Bill, try the link below in case you haven't seen it.. it has lots of examples of these frequancy response figures of various speaker systems:
    http://www.geocities.com/p_iturra/Misc_HT_Speakers.html
    I think these figures are the hard facts one can look at when searching for a good speaker, although figures vary depending on the test set-up.
    Regarding my question, I used three examples, 180hz, 100hz, and 80hz, with different crossover points, and without any of the three exhibiting a perfect xover point.
    180hz may be too high, although the 0db is good. At 180hz, the sub maybe threading on the midrange territory?
    100hz is respectable I guess, but at -3db, is it still that significant? I don't know, anyone can comment on that?
    While the 80hz is an excellent crossover frequency, will the -5db be of any value at all? I'm not sure about it.
     
  4. Bill Kane

    Bill Kane Screenwriter

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    Perhaps Phil Iturralde will step in to further expand on his site findings...
     
  5. StephenL

    StephenL Second Unit

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  6. Cire

    Cire Stunt Coordinator

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    Hmm.. perhaps these examples were all too bad nobody would choose among them.. [​IMG]
    a. sub and channels meeting at 180hz at 0db
    b. sub and channels meeting at 100hz at -3db
    c. sub and channels meeting at 80hz at -5db
    But then, is -5db insignificant? Are we only looking within +3db/-3db?
    Thanks..
     
  7. Phil Iturralde

    Phil Iturralde Screenwriter

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  8. Cire

    Cire Stunt Coordinator

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    thanks Phil, that was loud and clear.. [​IMG]
    quote: you would see many very popular HT speaker / sub combinations that blend anywhere between -0 dB to -5 dB
    Precisely! As i read that, this anti-Bose website came to mind, which said the only range that matters were between -3db and +3db.
    Now I don't know how true it is, but looking at those charts, several gaping holes would exist within the 20khz range.
    thanks again..
    Cire
     

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