JBL Makeover - Project Help

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  • amesrs
    Junior Member
    • Mar 2006
    • 6
    #1

    JBL Makeover - Project Help

    I've got a pair of JBL J350a 3-way loudspeakers (circa 1980-ish) that I use in my second system in the upstairs den. The drivers are in good shape and they sound decent but one thing I didn't like about them was the cabinet construction and wide baffles that they have (15-3/4"). I've got some leftover MDF laying around so I'd like to rebuild the crossover with newer components and rebuild the cabinets with better internal bracing/internal volume but with a narrower baffle profile of 10-3/4". I was able to obtian a .pdf file of the original technical manual showing the crossover schematic and a few of the driver specs.

    Can any of the crossover gurus assist me in changing the crossover to accomidate for the change in baffle step? Is this even going to be worthwhile to undertake? I can send the .pdf file to anyone who wants to tackle it. Thanks.
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    • ThomasW
      Moderator Emeritus
      • Aug 2000
      • 10933
      #2
      To correctly redesign the crossover one needs accurate frequency response measurements of the drivers mounted in the new baffle. Without that information any crossover design is a 'stab-in-the-dark'.

      IB subwoofer FAQ page

      "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson
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        • amesrs
          Junior Member
          • Mar 2006
          • 6
          #3
          What software/measuring equipment would be needed to do this?
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            • ThomasW
              Moderator Emeritus
              • Aug 2000
              • 10933
              #4
              test microphone, mic pre-amp, PC with duplex soundcard, and gated time domain (ETF/LMS) software. About $200-$300 if you have the PC and soundcard.

              IB subwoofer FAQ page

              "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson
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