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Flex Your PCD Mettle:

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    • Re: Flex Your PCD Mettle:

      What's the crossover in use for above?
      Custom made with PCD for this combination or what?
      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:

        Originally posted by Skywave-Rider View Post
        What's the crossover in use for above?
        Custom made with PCD for this combination or what?
        Yes.

        The drill is I design a crossover using the posted data in PCD and submit my design result as benchmark, with actual performance measurements. The challenge is to flex your own PCD mettle and do it better. Then, I load up that design, measure it, and we compare.

        The process reveals the strengths and weaknesses of the various combinations of EconoWave components, alignments, and filters in starkly objective relief.

        I don't post the details of my original attempt initially, but it's pretty easy for anyone working with the same data in PCD to figure out what I did, given the known limited spectrum of my own skills, well documented here.... :p
        Last edited by Zilch; 04-10-2010, 06:59 PM.

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        • Delite 10 Second Attempt:

          It's rare a system actually measures +/- 1 dB here:







          Attached Files

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          • Re: Flex Your PCD Mettle:

            Originally posted by Zilch View Post
            Were all measurments done with the foam treatments?


            What exactly is that anyways and where do you buy it?

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            • Re: Delite 10 Second Attempt:

              Originally posted by Zilch View Post
              It's rare a system actually measures +/- 1 dB here:
              Wow, looks awesome. That little notch did wonders.

              Too bad that waveguide is so ridiculously expensive.

              By the way, where can you purchase 18Sound drivers?
              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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              • Re: Flex Your PCD Mettle:

                Pete, I have ordered 18sound drivers from

                http://www.usspeaker.com/eighteensound%20index-1.htm

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                • Re: Delite 10 Second Attempt:

                  Originally posted by penngray View Post
                  Were all measurments done with the foam treatments?

                  What exactly is that anyways and where do you buy it?
                  It's pipe insulation from Home Depot.

                  Most measurements since Round #1 have been without it. Measurements showed that it made little difference and merely had a different "signature."


                  Wow, looks awesome. That little notch did wonders.

                  Too bad that waveguide is so ridiculously expensive.
                  Unlike most others we build with, XT1086 is aluminum.

                  The premium 1.5" throat versions of JBL PT waveguides are more expensive, actually, though there are recent releases of "econo" variants in several alternative dispersion patterns. The AE product family has expanded mind-bogglingly:

                  http://www.jblpro.com/catalog/genera...x?FId=25&MID=2

                  Click the AVS link in post #195 to see a way less expensive option from JBL. I'll probably be posting the variant using BMS 4540 here, but I want to try BMS 4552nd on the 18-Sound waveguide first, and confirm that 4550 behaves similarly.

                  [Or vice-versa, maybe.... ;) ]

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                  • Re: Flex Your PCD Mettle:

                    Wow! Nice response off axis. A bit bigger box and a port and you've got an excellent little MT that from as size point most people can live with. I do agree that the horn's a bit pricey and imagine there's a cheaper variant with acceptable tradeoffs somewhere out there.

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                    • Re: Flex Your PCD Mettle:

                      Originally posted by Mayhem13 View Post
                      Wow! Nice response off axis. A bit bigger box and a port and you've got an excellent little MT that from as size point most people can live with. I do agree that the horn's a bit pricey and imagine there's a cheaper variant with acceptable tradeoffs somewhere out there.
                      Working on that, of course. I'd snug the woofer and waveguide closer together to widen the forward lobe, but it's certainly the FR to beat.

                      Here's the HF wavelet:


                      http://www.audiomatica.it/download/audaesny2007.pdf
                      Attached Files

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                      • Re: Flex Your PCD Mettle:



                        $44.00.............:D

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                        • Re: Flex Your PCD Mettle:

                          Those work quite nicely, also, but not down this low.

                          [Think 8" woofer in AR4x-size cabs.... ]

                          $27 here:

                          http://www.loudspeakersplus.com/prod...?specific=1292
                          Last edited by Zilch; 04-20-2010, 04:21 AM.

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                          • Re: Flex Your PCD Mettle:

                            Aaargh.....that'll go to 1.5k no problem. Give it a shot!

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                            • Re: Flex Your PCD Mettle:

                              Originally posted by Mayhem13 View Post
                              Aaargh.....that'll go to 1.5k no problem. Give it a shot!
                              Done that, and so have they:

                              http://www.eighteensound.com/staticC...Sound_kit8.pdf

                              Attached Files

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                              • EconoWave Delite 10 - Vertical Directivity - Four Views

                                Source data:



                                Conventional polar map:



                                Waterfall plot:



                                Spectrogram (or some similar name ;) ):



                                The region of primary interest:

                                Attached Files

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