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  • follow up on ZA 14 vs Fountek

    This is a follow up to the ZA vs Fountek mid woofers.
    http://techtalk.parts-express.com/sh...d.php?t=215217
    Attached Files
    http://www.diy-ny.com/

  • #2
    Re: follow up on ZA 14 vs Fountek

    some shots while building
    Attached Files
    http://www.diy-ny.com/

    Comment


    • #3
      Re: follow up on ZA 14 vs Fountek

      Originally posted by r-carpenter View Post
      This is a follow up to the ZA vs Fountek mid woofers.
      http://techtalk.parts-express.com/sh...d.php?t=215217
      Nicely done, very nice. Don't see mitered joints around here very much what with most of us being **** joint kinds of guys.

      Dave
      "A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

      www.piaudiogroup.com

      http://www.avguide.com/blog/tas-rmaf...w-technologies
      http://positive-feedback.com/Issue47/ramblings.htm
      http://positive-feedback.com/Issue47/uber_buss.htm

      Comment


      • #4
        Re: follow up on ZA 14 vs Fountek

        en voala! layer of viscous elastomer is being applied inside before foam.
        tweeters are off center for less diffraction.
        Attached Files
        http://www.diy-ny.com/

        Comment


        • #5
          Re: follow up on ZA 14 vs Fountek

          Originally posted by dbe View Post
          Nicely done, very nice. Don't see mitered joints around here very much what with most of us being **** joint kinds of guys.

          Dave
          Can't even say b[]tt joint here... good grief. No wonder I got a warning for saying the proper name of a contraceptive device here a while back. PC run amok, amok, amok, amok.

          Dave
          "A man with an experience is never at the mercy of a man with an argument." - Hilmar von Campe

          www.piaudiogroup.com

          http://www.avguide.com/blog/tas-rmaf...w-technologies
          http://positive-feedback.com/Issue47/ramblings.htm
          http://positive-feedback.com/Issue47/uber_buss.htm

          Comment


          • #6
            Re: follow up on ZA 14 vs Fountek

            Thanks.

            Did anyone experimented with asymmetrical port placement? I mean in relation to a vertical center of the panel. I wander what kind of the effect it has on the midrange leakage.

            The speakers are 4.5L after the drivers and brace.
            Attached Files
            http://www.diy-ny.com/

            Comment


            • #7
              Re: follow up on ZA 14 vs Fountek

              Originally posted by dbe View Post
              Nicely done, very nice. Don't see mitered joints around here very much what with most of us being **** joint kinds of guys.

              Dave

              Comment


              • #8
                Re: follow up on ZA 14 vs Fountek

                Originally posted by r-carpenter View Post
                Thanks.

                Did anyone experimented with asymmetrical port placement? I mean in relation to a vertical center of the panel. I wander what kind of the effect it has on the midrange leakage.

                The speakers are 4.5L after the drivers and brace.
                Excellent question and astute conclusion. It has a MAJOR impact on midrange output in the passband of the woofer. Not only does the port resonate at a particular frequency, causing a ripple in overall response, it can allow a broad range of output that can mess with the sound.

                If possible, get it away from a position directly behind the woofer. An unobstructed pathway will allow much more information out than one where absorptive material is in the path. Loose fiberfill in the enclosure helps reduce the effects as long as airflow from the port is maintained.
                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


                • #9
                  Re: follow up on ZA 14 vs Fountek

                  Thanks Peter. I was going to place the port in the upper section of the cabinet, somewhat behind the tweeter. But now my curiosity is running wild. I'll make 2 or 3 dummy panels and move port from the very corner to a vertical center line and measure the output.
                  Then I build these speakers
                  http://techtalk.parts-express.com/al...pictureid=2038
                  port (2x9) was placed directly behind the RS180. It had an interesting effect and the speaker sounded somewhat "dipolish"
                  I also build this one a couple of years ago with down firing 2x9 flared port.
                  http://techtalk.parts-express.com/al...pictureid=2023
                  and that one had the best imaging that I've heard ever from anything else in my life.
                  So, I think port placement and how it relates to the sound especially in a 2 way design are worth playing with.
                  Attached Files
                  http://www.diy-ny.com/

                  Comment


                  • #10
                    Re: follow up on ZA 14 vs Fountek

                    back panels are ready for binding posts.
                    Attached Files
                    http://www.diy-ny.com/

                    Comment


                    • #11
                      Re: follow up on ZA 14 vs Fountek

                      ZA14/ProAcVifa combo= Zavic?Prozac?Fazac?
                      Attached Files
                      http://www.diy-ny.com/

                      Comment


                      • #12
                        Re: follow up on ZA 14 vs Fountek

                        made 3 dummy panels to play with port placement but that will be done next week.
                        Attached Files
                        http://www.diy-ny.com/

                        Comment


                        • #13
                          Re: follow up on ZA 14 vs Fountek

                          4 back panels are made
                          one with port pretty much behind the driver, vertical center line
                          second has the port in the upper section also vertically centered
                          one with the port moved in the corner
                          and one with the port close to the side and 2/3 up from the base
                          Attached Files
                          http://www.diy-ny.com/

                          Comment


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

                            Each panel is just clamped in for measurements. Microphone is about 1/4" in the port.
                            Levels remain constant throughout and only the backs are changed.
                            Speaker does not have any padding or stuffing, just a thin layer of elastomer.
                            First take is with the port located in lower section, vertical center.
                            gating, 500msc distance set at 0.
                            Attached Files
                            http://www.diy-ny.com/

                            Comment


                            • #15
                              Re: follow up on ZA 14 vs Fountek

                              from the left

                              port in the center upper section
                              port in the upper section close to the sidewall in the midle
                              port in the upper left corner
                              Attached Files
                              http://www.diy-ny.com/

                              Comment

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