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follow up on ZA 14 vs Fountek

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  • #16
    Re: follow up on ZA 14 vs Fountek

    I wonder if Martin King's spreadsheet could model port output changes with placement in a BR box? It models (accurately) port o/p in an MLTL

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    • #17
      Re: follow up on ZA 14 vs Fountek

      looks like with the port moved away from the center line the magnitude of usable output slightly drops and ripples move slightly but don't decrease or increase significantly. it appears that the worst port positioning is directly behind the driver, lower magnitude of what we need and relatively higher and wider mid range leakage.
      Green=directly behind the driver
      Red= centered vertically in the upper section.
      Attached Files
      http://www.diy-ny.com/

      Comment


      • #18
        Re: follow up on ZA 14 vs Fountek

        Here's CSD of the port output. Left is again, port behind the driver and rite is upper section vertical center placement
        Attached Files
        http://www.diy-ny.com/

        Comment


        • #19
          Re: follow up on ZA 14 vs Fountek

          Originally posted by r-carpenter View Post
          Here's CSD of the port output. Left is again, port behind the driver and rite is upper section vertical center placement
          Now, do it again with some of stuffing . . . ;)
          R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
          Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

          95% of Climate Models Agree: The Observations Must be Wrong
          "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

          Comment


          • #20
            Re: follow up on ZA 14 vs Fountek

            now, this is what happens then you put padding on the walls. a fundamental standing wave is still there (equal in length to the longest dimension, about 11 inches in this case) but lower in magnitude. Padding is only so effective. I also find stuffing such as accustuff only marginally effective in the ported loudspeaker. Unfortunately then you keep on adding it, the usable output drops down in magnitude together with the ripples. Ahh no luck in life.
            Peter, don't jump the gun I did.
            Anyway, here my to blonds and 2 redheads.
            Attached Files
            http://www.diy-ny.com/

            Comment


            • #21
              Re: follow up on ZA 14 vs Fountek

              here's what the output looks like roughly after padding was added. Note: the over all level was changed in the process.
              Attached Files
              http://www.diy-ny.com/

              Comment


              • #22
                Re: follow up on ZA 14 vs Fountek

                Originally posted by r-carpenter View Post
                now, this is what happens then you put padding on the walls. a fundamental standing wave is still there (equal in length to the longest dimension, about 11 inches in this case) but lower in magnitude. Padding is only so effective. I also find stuffing such as accustuff only marginally effective in the ported loudspeaker. Unfortunately then you keep on adding it, the usable output drops down in magnitude together with the ripples. Ahh no luck in life.
                Peter, don't jump the gun I did.
                Anyway, here my to blonds and 2 redheads.
                Very cool!!!

                Instead of Acoustastuff, try a hunk of Owens Corning 703 on the back wall.
                R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                95% of Climate Models Agree: The Observations Must be Wrong
                "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                Comment


                • #23
                  Re: follow up on ZA 14 vs Fountek

                  Originally posted by r-carpenter View Post
                  here's what the output looks like roughly after padding was added. Note: the over all level was changed in the process.
                  Is that Proac-Vifa the Neo-DX25?

                  I love Bird's Eye Maple!
                  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


                  • #24
                    Re: follow up on ZA 14 vs Fountek

                    Originally posted by Wolf View Post
                    Is that Proac-Vifa the Neo-DX25?

                    I love Bird's Eye Maple!
                    Wolf
                    yep. i got a few.
                    http://www.diy-ny.com/

                    Comment


                    • #25
                      Re: follow up on ZA 14 vs Fountek

                      been playing with the crossover modeling for a couple of days. Decided on 4th/2nd L/R electrical without notch. Will post modeled results in a day or so.
                      http://www.diy-ny.com/

                      Comment


                      • #26
                        Re: follow up on ZA 14 vs Fountek

                        small update. Modeled response with 4th order. Fountek/Vifa crossover
                        Tweeter was measured slightly of axis.
                        Attached Files
                        http://www.diy-ny.com/

                        Comment


                        • #27
                          Re: follow up on ZA 14 vs Fountek

                          and ZA14/vifa
                          Attached Files
                          http://www.diy-ny.com/

                          Comment


                          • #28
                            Re: follow up on ZA 14 vs Fountek

                            man, those are both lovely pairs of speakers. I look forward to listening impressions.
                            I am trolling you.

                            Comment


                            • #29
                              Re: follow up on ZA 14 vs Fountek

                              Very cool!!!

                              Instead of Acoustastuff, try a hunk of Owens Corning 703 on the back wall.
                              Where can one buy 703?

                              Comment


                              • #30
                                Re: follow up on ZA 14 vs Fountek

                                Originally posted by Paul Ebert View Post
                                Where can one buy 703?
                                http://www.atsacoustics.com/item--Ow...f-6--1004.html
                                R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                                Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                                95% of Climate Models Agree: The Observations Must be Wrong
                                "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                                Comment

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