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  • Can you make a comment on this design

    I think this is a fairly easy design and I want to make a similar or copy for dedicate music speaker.. and ofcourse if I copy.. I will change the mid driver to frostex full range... or maybe cheaper base driver too... does it require a lot of power to get the spl from such design


    http://www.lotusgroupusa.com/Granada.htm

  • #2
    Re: Can you make a comment on this design

    You are heading down the path that Martin King details on his webpage: http://www.quarter-wave.com/Project08/Project08.html

    F102A with a large Goldwood woofer in an open baffle.

    -David

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    • #3
      Re: Can you make a comment on this design

      I noticed in the gallery on King's site several "H-Frame" configurations, where a large driver is mounted approx. 1/2 way into a box (or tube) which is open front and back. I was wondering how the "H-Frame" differs (advantages/disadvantages/freq. resp.) from a typical open back dipole mounting arrangement.

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      • #4
        Re: Can you make a comment on this design

        Is there an advantage to lambskin leather surrounds besides being able to say you have speakers with lambskin leather surrounds?

        I, for one, hate it when grown men cry over speakers...:D

        Looks like a fun project to emulate, though...


        Mark
        You go your way, I'll go mine. I don't care if we get there on time.

        ~Pink Floyd

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        • #5
          Re: Can you make a comment on this design

          For more on H- and U-frame woofer, I suggest Linkwitz' analysis
          http://linkwitzlab.com/frontiers.htm#L

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          • #6
            Re: Can you make a comment on this design

            A larger baffle helps to lower the dipole cutoff frequency (thus making low frequencies more efficient). H-frame is a way to get a larger effective baffle without a super wide frame. Disadvantage is an H-frame will give a 1/4 wave resonance that if in band must be equalized.

            Linkwitz talks alot about this.
            http://www.linkwitzlab.com/frontiers.htm#L

            -David

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            • #7
              Re: Can you make a comment on this design

              Originally posted by Mark65 View Post
              Is there an advantage to lambskin leather surrounds besides being able to say you have speakers with lambskin leather surrounds?

              I, for one, hate it when grown men cry over speakers...:D

              Looks like a fun project to emulate, though...


              Mark
              I've heard that latex surrounds are safer.

              Comment


              • #8
                Re: Can you make a comment on this design

                Originally posted by depthsounder View Post
                I've heard that latex surrounds are safer.
                Naw.... velour!
                "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy." --Winston Churchill

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                • #9
                  Re: Can you make a comment on this design

                  Originally posted by depthsounder View Post
                  I've heard that latex surrounds are safer.
                  Some people are allergic to latex surrounds.
                  Don't listen to me - I have not sold any $150,000 speakers.

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                  • #10
                    Re: Can you make a comment on this design

                    Oh and back to OP's question about power. You will not need very much power to drive these speakers to full excursion in an open baffle. 50WPC is probably sufficient.

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                    • #11
                      Re: Can you make a comment on this design

                      Originally posted by dusty View Post
                      I think this is a fairly easy design and I want to make a similar or copy for dedicate music speaker.. and ofcourse if I copy.. I will change the mid driver to frostex full range... or maybe cheaper base driver too... does it require a lot of power to get the spl from such design


                      http://www.lotusgroupusa.com/Granada.htm
                      Boy if you layed your hands on a great slab of wood this would be a great project for that. Even though I would never recomend using solid wood on a baffle that big, it would still look great (up until the time it splits in half)
                      Mark


                      http://www.diy-ny.com

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