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Diffusing drivers that beam?

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  • Diffusing drivers that beam?

    I don't think this is possible, but I figured I would ask.

    I was speaking with an audiophile friend as we were listening to my system.

    We were discussing the beaming of full-range drivers and wondering if there were every any solutions that didn't involve adding a small tweeter.

    We could think of the Bose 901 where eight of the drivers were on the back of the speaker and reflected.

    And then there are full-range designs like the Walsh driver which seem to (by nature of their mounting at least) radiate in a different pattern?

    I also remembered those lenses used by JBL on their horn drivers (remember those?), and I'm not sure what their intended purpose was.

    Our consensus was that at least in the case of the Bose 901, that the drivers still beam when reflecting, that it could be a hairy mess where the ear is involved.

    And that we just don't know anything about Walsh drivers or lenses on horns.

    Even though I expect it to sound poor, I plan on turning my satellites so the drivers face the rear wall, and listen for a while. I'm kinda curious to compare imaging, and maybe take some measurements and see how the in-room response changes.

  • #2
    One method was firing into a curved reflective surface so waves are reflected outward.
    "Not a Speaker Designer - Not even on the Internet"
    “Pride is your greatest enemy, humility is your greatest friend.”
    "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

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    • #3
      Originally posted by Sydney View Post
      One method was firing into a curved reflective surface so waves are reflected outward.
      That is kind of interesting, as my dad was a photographer that did a lot of industrial work and used similar methods to diffuse enormous strobes.

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      • #4
        The principles are the same.
        http://www.roger-russell.com/omni/omni.htm
        https://evangelriclapore.files.wordp...ens-page01.jpg
        https://evangelriclapore.files.wordp...ens-page02.jpg
        https://evangelriclapore.files.wordp...ens-page03.jpg
        "Not a Speaker Designer - Not even on the Internet"
        “Pride is your greatest enemy, humility is your greatest friend.”
        "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

        Comment


        • #5
          JBL developed this waveguide/diffraction lens for one of their powered speakers systems, no idea how well it works but it might be something to try.
          Attached Files
          Paul O

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          • #6
            It's pretty simple really, make the obstacle large enough to reflect shorter wavelengths while longer wavelengths diffract around it.
            www.billfitzmaurice.com
            www.billfitzmaurice.info/forum

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            • #7
              Originally posted by Paul O View Post
              JBL developed this waveguide/diffraction lens for one of their powered speakers systems, no idea how well it works but it might be something to try.
              So where could I read-up on the interesting cutout JBL places over their 15" bass driver, I wonder?

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