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Is the ' PM180-8 ' a ' PS180-8 ' without the whizzer ?

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  • Is the ' PM180-8 ' a ' PS180-8 ' without the whizzer ?

    ?

  • #2
    If they're not siblings then they're cousins.
    www.billfitzmaurice.com
    www.billfitzmaurice.info/forum

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    • #3
      Nope- they are very different.
      The PS has phase plugs and no vented pole
      The PM has a vented pole and no phase plug.

      They are very different drivers.
      Wolf
      "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
      "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
      "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
      "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

      *InDIYana event website*

      Photobucket pages:
      https://app.photobucket.com/u/wolf_teeth_speaker

      My blog/writeups/thoughts here at PE:
      http://techtalk.parts-express.com/blog.php?u=4102

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      • #4
        They appear to have the same frame, very similar cone, same suspension, same magnet, and same voice coil based on specs and visuals.

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        • #5
          From memory, the PS have a higher concentration of Kevlar fibers than the PM series do. The method the PM drivers came about, was a PS series driver that had the central pole piece and whizzer removed, and then a vented dustcap applied. It was found that the performance was not hampered by their removal. I think the cone formula was changed for FR changes for the better. I was told this by someone in the know about 10 years ago, so it COULD be a little fuzzy in terms of accuracy.

          Wolf
          "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
          "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
          "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
          "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

          *InDIYana event website*

          Photobucket pages:
          https://app.photobucket.com/u/wolf_teeth_speaker

          My blog/writeups/thoughts here at PE:
          http://techtalk.parts-express.com/blog.php?u=4102

          Comment


          • #6
            Click image for larger version

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            The PS180-8 has the same motor, frame and surround as the PM180-8. The cones are very similar, but the current PS180-8 has a curvilinear cone profile, whereas the PM180-8 that I have has a straight cone. Both have the same "vent" hole in the pole, but the PS is filled with a phase plug, and the PM's hole is blocked in the rear by a sticker. Above is a DATS sweep, PM is green line, PS-180 in blue.
            "Looks like you may have to design your own speakers. Its not that hard." -DE Focht

            Diffraction Happens

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            • #7
              Sound similar ..... Is it cymbals or ' whizzer tizz ' ? Click image for larger version

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