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Flex Your PCD Mettle:

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  • Attached Files
    Last edited by Zilch; 06-03-2010, 03:32 AM.

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    • Re: Flex Your PCD Mettle:

      It's clear why JBL crosses this waveguide at 2.4 kHz in AC16:





      Abort? ;)
      Attached Files

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      • Re: Flex Your PCD Mettle:

        Yikes indeed!!! :eek:

        To get to 2.4KHz, a more capable woofer seems to be in order. Trying to get that one to reach that high seems doubtful. Even with the massive peaking you attempted with the transfer function doesn't push it high enough.



        Perhaps the ScanSpeak Discovery 22W might do the trick.

        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


        • Re: Flex Your PCD Mettle:

          I'd just scrap the idea of using that WG. I've seen smoother responses from an Eminence coax and that Selenium. I wonder how those small PE WGs would perform......... One small WG that has been shown to have good performance is the 6" one from MCM. Might be worth checking out.
          http://www.mcmelectronics.com/produc...M-H-65-/54-580

          Dan
          "guitar polygamy is a satisfying and socially acceptable alternative lifestyle."~Tony Woolley
          http://dtmblabber.blogspot.com/
          http://soundcloud.com/dantheman-10

          Comment


          • Re: Flex Your PCD Mettle:

            Yikes indeed!!! :eek:

            Comment


            • Re: Flex Your PCD Mettle:

              What we need is a WG that has loading to 1KHz . . . ;)

              I believe you linked to a PE variant?
              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


              • Re: Flex Your PCD Mettle:

                Is that the 6x6 JBL waveguide? Too bad...I've got them and they were probably going into a pair of rear surrounds (w/ Eminence Deltalite II 2510?). Oh well, another $13 goes into the spare parts pile. :o

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                • Re: Flex Your PCD Mettle:

                  What we need is a WG that has loading to 1KHz . . . ;)
                  Proving once again that size matters.

                  Originally posted by donprice View Post
                  Is that the 6x6 JBL waveguide? Too bad...I've got them and they were probably going into a pair of rear surrounds (w/ Eminence Deltalite II 2510?). Oh well, another $13 goes into the spare parts pile. :o

                  Comment


                  • Re: Flex Your PCD Mettle:

                    I was hoping to recycle the eWave crossovers when I upgrade the mains to the QSC/DE250 combo. It will be 2011 so I have plenty of time shop for woofers and/or different waveguide.

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                    • Re: Flex Your PCD Mettle:

                      Originally posted by dantheman View Post
                      I'd just scrap the idea of using that WG. I've seen smoother responses from an Eminence coax and that Selenium.
                      This will be next, if I can't come to a quick resolution here:

                      http://www.eighteensound.com/index.a...roduct&pid=179

                      Comment


                      • Re: Flex Your PCD Mettle:

                        :D
                        http://www.nytimes.com/2010/10/14/bu...html?src=busln

                        http://mixonline.com/mag/audio_new_york_metro_46/

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                        • Re: Flex Your PCD Mettle:

                          1) Removed the grille blocks, and there was no measurable difference.

                          2) Tried crossing at 1.8 kHz with my "First Try" highpass - not high enough.

                          3) Installed XT120 w/bolt-on D220Ti - plays a bit lower, but not low enough.

                          4) Tried the 18-Sound HD125 driver it was made for - about the same

                          5) Tried B&C DE-10 - best of those; close, but still not good enough:



                          6) JBL 8" PT waveguide, presently in AR4x, looks like it'll get where we need to be:



                          I'll load it in for a restart.

                          Footnote: Stock crossover has no lowpass; they ran it full range, wart and all.

                          [Maybe it didn't have a wart originally.... ;) ]
                          Attached Files
                          Last edited by Zilch; 06-04-2010, 04:35 PM.

                          Comment


                          • Re: Flex Your PCD Mettle:

                            The Lambda TD10 series is likely to behave just like the TD12, with wider dispersion and smooth response.

                            I've got my eye on an upcoming project using a modified 122i waveguide profile to load the RS28F paired with the TD10S.

                            Should make for a heck of a two-way.
                            Very nice!!

                            Im going to be mating a waveguide with the SB29. Im waiting for the SB29/waveguide prototype from Mayhem.

                            I have many TD series woofers already in use so Im a HUGE fan. Best drivers I have owned. The new 6.5" TD series are out now too.

                            Comment


                            • Re: Flex Your PCD Mettle:

                              Originally posted by penngray View Post
                              Very nice!!

                              Im going to be mating a waveguide with the SB29. Im waiting for the SB29/waveguide prototype from Mayhem.

                              I have many TD series woofers already in use so Im a HUGE fan. Best drivers I have owned. The new 6.5" TD series are out now too.
                              Where are the 6.5" units? AE doesn't show them at their on-line store!!!
                              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


                              • Re: Flex Your PCD Mettle:

                                http://www.aespeakers.com/phpbb2/vie...php?f=3&t=2493

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