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Flex Your PCD Mettle:

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  • Re: Flex Your PCD Mettle:

    Zilch, I apologize if this has been asked.

    But how do I set the L-pad adjustment dial. Do I just set it in the middle and use the ears to see what I like? Does the level depend on the build?
    My simple speaker project
    My simple subwoofer project

    The Inlaws Hometheater

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    • Re: Flex Your PCD Mettle:

      Originally posted by bruson View Post
      Has anyone done a MTM arrangement with the Econowave?
      None yet, and we have no data on how they might behave. Others have inquired about horizontal MTM for center channel, and we have discouraged the approach, though here, too, we have no hard data.


      Originally posted by stgdz View Post
      But how do I set the L-pad adjustment dial. Do I just set it in the middle and use the ears to see what I like? Does the level depend on the build?
      In all of the builds in this thread, we have designed with the L-pad set to the 1:00 position. The original generic crossovers anticipated use with a variety of woofers with two basic variants based upon woofer sensitivity, low (< 95 dB) and high (>95 dB), and level depended more upon the build. In any case, adjust to taste and room....

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      • Re: Flex Your PCD Mettle:

        Originally posted by Zilch View Post
        Others have inquired about horizontal MTM for center channel, and we have discouraged the approach, though here, too, we have no hard data.
        I'm hoping at some point you do experiment with some form of horizontal layout.

        So I can quit "inquiring"..... and start cutting out some holes in my baffle. ;)

        What about commercial Floor Monitors? What do they do to address the nulls?

        Or are the nulls a feature and not a bug in such applications?

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        • Re: Flex Your PCD Mettle:

          Originally posted by Flacjunky View Post
          I'm hoping at some point you do experiment with some form of horizontal layout.

          So I can quit "inquiring"..... and start cutting out some holes in my baffle. ;)

          What about commercial Floor Monitors? What do they do to address the nulls?

          Or are the nulls a feature and not a bug in such applications?
          It's a feature; they want narrow horizontal dispersion and ideally, asymmetric "vertical."

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          • Re: Flex Your PCD Mettle:

            Originally posted by bruson View Post
            Has anyone done a MTM arrangement with the Econowave?
            Or does that add to the null problems?
            I did an MTM test and the nulls were very problematic using much smaller woofers then yours. The problem came up below crossover -- where the tweeter gives out, you now have a very large center to center distance between the two woofers and the vertical pattern becomes really narrow.

            Putting two drivers side by side below the waveguide at crossover worked well, though. I was using 5.25" drivers, though, two tens would look something like a 20" driver horizontally, and would be pretty narrow horizontally then where it is supposed to meet up with the waveguide. You could put the woofers vertically below the guide, and not cross the lowest one in till about 300Hz, as a baffle step correction -- but only if you'll be using the speakers out away from the wall I'd think.
            Free & Free-form simulator/designer for Passive Crossovers
            SynergyCalc 5: design spreadsheet for Wooden horns and DIY Synergy Waveguides
            Super easy and cheap to make high performance sound diffusers

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            • Re: Flex Your PCD Mettle:

              The two 2432H I have are factory new in box; here they are on the same crossover in comparison to the (Red) design 2452H-SL:



              And here's the lot:

              Attached Files

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              • Re: Flex Your PCD Mettle:

                Looks lile another possible WG element......not the cheapest but...

                http://www.parts-express.com/images/.../294-800_s.jpg

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                • http://www.jblpro.com/catalog/genera...?PId=317&MId=2
                  Attached Files

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                  • Re: Flex Your PCD Mettle:

                    So if your speakers are 9ft away, you've essentially got over a 4ft vertical window by the -6dB points. Or at 6ft you've got 2ft 9+inches. Plenty IMO.

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

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                    • Footnote: Don't know if everyone gets this part, but the vertical locus of the system acoustic center is the midpoint between drivers, independent of the "z" offsets, which is why I design with that in consideration. The tweeter axis has an inherent angular "y" offset from there, which varies with listening distance....

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                      • HPA+ Horizontal Directivity

                        We could probably achieve a smoother transition by moving the crossover frequency up, but would sacrifice some forward vertical lobe height achieving that. I believe there is more yet to be accomplished with baffle improvements, so I'm leaving it be for now:
                        Attached Files

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                        • HPA+ Horizontal Directivity, Continued

                          The normalized views:
                          Attached Files
                          Last edited by Zilch; 08-18-2010, 03:35 AM.

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                          • Re: Flex Your PCD Mettle:

                            Anyone E-waved with this yet?



                            http://eminence.com/proaudio_speaker...ail_link=DELTA PRO-12A&speaker_size=12&SUB_CAT_ID=1

                            Very efficient and mfgrs measurments are pretty close to Klite12H0. Bass extension isn't as deep though....but for sub users...:D Chassis depth and i suspect AC is about 1" deeper than Klite so an easier mate to the 152i guide. Here's a Unibox sim ported........

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                            • Re: Flex Your PCD Mettle:

                              You might be able to get that woofer to work if crossed low enough.
                              polar graph in 11.25 degree steps:


                              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:

                                Originally posted by dantheman View Post
                                You might be able to get that woofer to work if crossed low enough.
                                polar graph in 11.25 degree steps:


                                Dan
                                Standard E-wave fair is 1.6khz....low enough?

                                Where'd you get the polars from?

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