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  • how to enter R2 into PCD

    I am having a hard time configuring PCD to accept R2 in the tweeter circuit of the econowave crossover into PCD location R14.

    For example using one of Zilches studies, I want to emulate the "SpitWad". In that econowave crossover, R2 is the dampening resister used for the compression drivers high freq contour circuit. So I start by importing into PCD both the zma and frd files for the compression driver. Then I add a second order crossover in PCD in locations C9 and L9, which are the equivalent econowave crossover values for C1 and L1. Next I want to add econowave crossover value R2 into PCD location R14, but it is blacked out in PCD.

    Please help.
    Regards!

    Comment


    • EconoWave Crossover in PCD:

      Model the highpass as 4th order:

      1) C9 & L9 are the core filter,
      2) C10 is 1000 uF; lower that to something real for true 3rd order, if required,
      3) L10 is 0 mH, E-Wave's R2 goes into its DCR as R14
      4) In series after the HP filter gets E-Wave's C1, R1 as "Parallel RC Contour Filter" C11, R15,
      5) The L-pad at 1:00 is already in the HF driver.frd.

      Thus, the full range of Wayne Parham's crossover topology may be modeled in PCD. Make the lowpass 3rd order, if required, add a Zobel, damping resistor in series with C2, whatever is desired.

      I think Pete uses a different approach, but that's how I do it....

      Comment


      • Re: Flex Your PCD Mettle:

        any progress made on the 152 waveguide and parts express?
        My simple speaker project
        My simple subwoofer project

        The Inlaws Hometheater

        Comment


        • Re: Flex Your PCD Mettle:

          I have inquired, but do not have a direct communication path to whoever's doing it there....

          Comment


          • Re: Flex Your PCD Mettle:

            I have some inside connections. They have a sample of the waveguide in hand (from me), and are looking into the possibility of sourcing the waveguides directly from QSC. No word yet on whether that will work.
            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: EconoWave Crossover in PCD:

              Originally posted by Zilch View Post
              Model the highpass as 4th order:

              1) C9 & L9 are the core filter,
              2) C10 is 1000 uF; lower that to something real for true 3rd order, if required,
              3) L10 is 0 mH, E-Wave's R2 goes into its DCR as R14
              4) In series after the HP filter gets E-Wave's C1, R1 as "Parallel RC Contour Filter" C11, R15,
              5) The L-pad at 1:00 is already in the HF driver.frd.

              Thus, the full range of Wayne Parham's crossover topology may be modeled in PCD. Make the lowpass 3rd order, if required, add a Zobel, damping resistor in series with C2, whatever is desired.

              I think Pete uses a different approach, but that's how I do it....
              Thank you very much Zilch!

              Comment


              • Re: Flex Your PCD Mettle:

                So I seem to have run into a problem with my econo wave mutant 10e surround.


                I substituted the dayton 10 pro woofer for the 10e and used the 152i waveguide instead of the round one.


                I got around to measuring it because I just wasn't hearing a midrange with them. Turns out I was rite
                Woofer

                Both combined

                Note this is in my basement and using a rat shack meter but it got some decent results.

                So the upper range looks fine and rolls off around 2k but the woofer looks like it rolls off around 300. I used the same crossover as the 10e, any idea why its not crossing at 2k on the woofer?
                My simple speaker project
                My simple subwoofer project

                The Inlaws Hometheater

                Comment


                • Re: Flex Your PCD Mettle:

                  If the combined response is less than the woofer alone, try reversing the polarity on the HF driver.

                  You need a really big room to measure 300 Hz...don't worry about it.

                  Comment


                  • Re: EconoWave HPB+ Data:

                    Can someone tell me what the final crossover ended up being for this configuration? I just may have to build a pair.
                    Steve

                    Originally posted by Zilch View Post
                    Raw driver responses:




                    Here, in PCD:




                    The measured result:

                    Comment


                    • Re: EconoWave HPB+ Data:

                      Originally posted by srbliss View Post
                      Can someone tell me what the final crossover ended up being for this configuration? I just may have to build a pair.
                      Steve
                      I believe that would be the post # 707. Nothing econo about it but you already know that. :D

                      Comment


                      • Re: EconoWave HPB+ Data:

                        I saw that but there are a lot of mods that went on after this was posted. Fortunately before I was house poor I was able get the 2452H-SL's, waveguides and a nice pair of 2235's to make my 'FrankenVals' (old Altec Valentias with JBLs loaded.) The one I have done sounds pretty good - thanks to Zilch (I am fortunate to live an hour away so I get to visit the master in person.)
                        But the cabinet is really a huge compromise and needs to go so I am thinking the not so econo-HP plus my 2235's in B380 sub clones my be the way to go.
                        Steve


                        Originally posted by donprice View Post
                        I believe that would be the post # 707. Nothing econo about it but you already know that. :D

                        Comment


                        • Re: Flex Your PCD Mettle:

                          Seems I'm just not real good at keeping secrets from you guys.... ;)

                          80642/1060=76.0774

                          Comment


                          • EconoWave Mini S-8: Summary





                            Errata: 'Til I get around to fixing it, correct PE Part# for L1 is 255-032.













                            Attached Files
                            Last edited by Zilch; 12-13-2010, 09:40 PM.

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                            • EconoWave Mini S-8 Addendum

                              3D3A Laboratory Variants:

                              http://www.princeton.edu/3D3A/

                              [I'll show 'em here.... ]

                              Comment


                              • Re: Flex Your PCD Mettle:

                                Looks like we have an econowave surround now
                                How well would they play with the SRs?


                                So the two directivity plots, one is for the two different mounting configurations correct?
                                My simple speaker project
                                My simple subwoofer project

                                The Inlaws Hometheater

                                Comment

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