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  • #61
    Re: Distortion Measurements:

    That tweeter distortion level is mighty small indeed.
    With a 1W/1m sensitivity of 108.5 dB, even with the requisite HF comp, it's running on milliwatts there.

    [Yeah, biampably.... ;) ]
    Last edited by Zilch; 02-17-2010, 03:48 AM.

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    • #62
      Re: Flex Your PCD Mettle:

      The pair:

      Attached Files

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      • #63
        Re: Flex Your PCD Mettle:

        Originally posted by Zilch View Post
        The pair:

        Well? How about a listener description of what you've auditioned?
        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.

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        • #64
          Re: Flex Your PCD Mettle:

          Well? How about a listener description of what you've auditioned?
          We've quite stepped in it with this combo.... :D

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          • #65
            Re: Flex Your PCD Mettle:

            Nice job, Pete and Zilch, with the minimalist XO!

            About the Kappalite distortion, I'm inclined to trust Brandon's measurement which looks a lot better at LF than what Zilch measured. He mounted it on a large OB, 100dB at 30", mic at 15".

            http://493531664873718246-a-18027447...attredirects=0
            Dennis

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            • #66
              Re: Flex Your PCD Mettle:

              Originally posted by Dennis H View Post
              Nice job, Pete and Zilch, with the minimalist XO!

              About the Kappalite distortion, I'm inclined to trust Brandon's measurement which looks a lot better at LF than what Zilch measured. He mounted it on a large OB, 100dB at 30", mic at 15".

              http://493531664873718246-a-18027447...attredirects=0
              I kind of figured that room effects could be causing that. Everything I'd seen on the Kappalites showed excellent performance, as in the attachment you linked to.
              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


              • #67
                Attached Files

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                • #68
                  Re: Constant Directivity RULEZ!

                  Check out this waveguide loaded (PE 10") SB Acoustics ring radiator. Care of Zaph.



                  And with a single 5.6uF capacitor. 15deg off axis



                  This could be an alternate top end for this particular woofer.
                  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


                  • #69
                    Re: Flex Your PCD Mettle:

                    DRAT!

                    Now I gotta measure the horizontals....

                    :D

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                    • #70

                      http://sites.google.com/site/driverv...c-pl-000446-gp
                      Attached Files
                      Last edited by Zilch; 05-31-2010, 01:15 AM.

                      Comment


                      • #71
                        Re: Flex Your PCD Mettle:

                        Those sure are consistent plots. I'm really looking forward to hearing these some day.

                        You know if anyone is doing one of these in the Indiana area? Maybe bring one to InDIYana?
                        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


                        • #72
                          EconoWave Deluxe:











                          Attached Files
                          Last edited by Zilch; 08-14-2010, 01:50 AM.

                          Comment


                          • #73
                            Re: Flex Your PCD Mettle:

                            Zilch,
                            Just ordered three of the QSC waveguides. Plan on building w/ the XO and drivers from this thread (also following on AK).

                            Did you port the cabinet?
                            How picky is the XO to this cabinet, I would like to build my own since I have a bunch of leftover 3/4" baltic birch left over from a recent subwoofer build (I would like to build a rectangular cabinet to blend w/ my subwoofer)?
                            Would a supertweeter help (due to the roll off over 15 kHz) or hurt the overall sound?

                            Overall this looks like a fun project, should easily beat the sound of my 16 yr old Paradigm 9seMkIII's.

                            SWN

                            Comment


                            • #74
                              Re: Flex Your PCD Mettle:

                              Originally posted by NWCgrad View Post
                              Zilch,
                              Just ordered three of the QSC waveguides. Plan on building w/ the XO and drivers from this thread (also following on AK).

                              Did you port the cabinet?
                              How picky is the XO to this cabinet, I would like to build my own since I have a bunch of leftover 3/4" baltic birch left over from a recent subwoofer build (I would like to build a rectangular cabinet to blend w/ my subwoofer)?
                              Would a supertweeter help (due to the roll off over 15 kHz) or hurt the overall sound?

                              Overall this looks like a fun project, should easily beat the sound of my 16 yr old Paradigm 9seMkIII's.

                              SWN
                              If you keep the baffle width the same, then the XO should work without any changes.

                              The cabinet Zilch uses isn't optimal for an un EQ'd driver for bass since he plans on adding boost. If you're not going to actively EQ the low end, you may want to alter the cabinet to extend the low end that way.
                              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


                              • #75
                                Re: Flex Your PCD Mettle:

                                If you keep the baffle width the same, then the XO should work without any changes.

                                The cabinet Zilch uses isn't optimal for an un EQ'd driver for bass since he plans on adding boost. If you're not going to actively EQ the low end, you may want to alter the cabinet to extend the low end that way.
                                Thanks for the information. Planning on staying passive. Looking at the specs for the woofer it seems that a larger enclosure (maintaining the same baffle width) would be the way to go to extend the low end. I see the recommended enclosure volume is 1.3-3.0 cu.f.t; am I correct that the low end extends as you approach 3.0 cu. ft.? Does this change the upper frequencies of the woofer's response?

                                Just as an aside, could another woofer be used as the L-pad can match the levels? (I am assuming NOT, but we all know what happens when you assume).

                                Lastly, would an air core inductor (such as the Jantzen 4.5mH 18 AWG Air Core Inductor [Sku 255-282]) offer any sonic advantage over the ERSE I-core inductor? The cost differential for 2 isn't that much.

                                Thanks for the reply! Trying to minimize cost, while maximizing quality. I only upgrade speakers about once a decade, so I have to get it right when I do.

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