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Flex Your PCD Mettle:

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  • Re: Flex Your PCD Mettle:

    New player in the game - dipolar snap-in waveguide for AMT. Watch Joachim Gerhard work on G-poles.
    Attached Files

    Comment


    • Re: Flex Your PCD Mettle:

      Ok, sorry to get a teensy bit off topic, but now that I've installed a new W7 compatible DVD drive, and then Windows Office, which has allowed me to run PCD...

      I'm having a wee bit of trouble generating a .zma with the response modeler portion. Attached is a screenshot of the spreadsheet 'in action'. I would appreciate it if anyone could give me a bonk on the head and let me know what I'm screwing up. Thanks!

      In the meantime I'll just need to play with the tweeter :p.
      Attached Files

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      • Re: Flex Your PCD Mettle:

        OT: I'm flexing my HolmIpulse mettle (or lack thereof) below.

        My son is going to help me get PCD up and going sometime soon.

        Speaker: SUB (2-15" Clamshell design), MID (B&C 10PS26) and TWEET (B&C DE250)

        All together @ 2M:



        SUB alone @ 2M:


        MID alone @ 2M:


        TWEET alone @2M:


        MID and TWEET @ 2M:


        I have lots of reflections and comb filtering going on in my echo chamber of a room.

        Taking measurements at 1M and 1 foot look better with many fewer suck outs and peaks.

        Subjectively it sounds really good with all the many imperfections.
        When I listen up close at about 2 feet the sound is very smooth.

        Lots of work to do to improve it.

        Any comments?

        Comment


        • Re: Flex Your PCD Mettle:

          bruson,
          Have you tried inverting the polarity on the sub and measured?

          I think that would be useful to A/B but at or near the listening position. Don't know if that is 2m.

          I think it looks pretty good so far for a real world listening room.
          http://www.nytimes.com/2010/10/14/bu...html?src=busln

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

          Comment


          • Re: Flex Your PCD Mettle:

            Originally posted by Skywave-Rider View Post
            bruson,
            Have you tried inverting the polarity on the sub and measured?

            I think that would be useful to A/B but at or near the listening position. Don't know if that is 2m.

            I think it looks pretty good so far for a real world listening room.
            Sub reverse polarity:


            Normal Polarity:


            All from my sitting position about 9 feet away.

            With a simple polarity change, without touching the mic a lot of things changed.
            I'm using the Dayton EMM6 mic and a Behringer Xenyx 502 pre.
            Are they that sensitive?
            I noticed when I move the mc 1/2 inch to an 1 inch lots of big changes happen. It can make my measurements lot OK or terrible.

            Is there a better way?

            Comment


            • Re: Flex Your PCD Mettle:

              ONE speaker at a time, unless the mic is precisely (within 1/8") on the acoustic center between them.

              Are you doing that?

              Comment


              • Re: Flex Your PCD Mettle:

                Originally posted by Zilch View Post
                ONE speaker at a time, unless the mic is precisely (within 1/8") on the acoustic center between them.

                Are you doing that?
                I am using only one speaker at a time. And the sub. No change except for the polarity on the sub.

                Wild disparities happened multiple times at different measurements. Sometimes a huge midrange suck out, sometimes the tweeter rolled off steeply at 5K. Wacky. Or my inexperience is showing. Maybe something is intermittent and I haven't tracked it down yet. So I show the good readings not the great readings, too unbelievable. I also don't show the really fantasy crappy readings. I hope I figure it out soon.

                My sub FR may look a little goosed because with 2 main speakers playing I think they add about 3db to all frequencies above 100hz. I may end up with reversed polarity when I go back to 2 main speakers so it adds a bit more bass for taste.

                Comment


                • Re: Flex Your PCD Mettle:

                  Hey Zilch,

                  Has anyone used the Eminence Beta 12LTA?

                  Thanks.

                  Comment


                  • Re: Flex Your PCD Mettle:

                    If you can't replicate the results, excepting maybe for very LF when a truck rumbles by, then you have issues. I had that problem measuring in SoundEasy. So I gave up on that and went with different measuring software. If you don't change anything, and you're getting variable results, you might have some software problems as I did, or maybe intermittent switching in your system.
                    PS, get behind the mic and don't move around when measuring. : )

                    Originally posted by bruson View Post
                    I am using only one speaker at a time. And the sub. No change except for the polarity on the sub.

                    Wild disparities happened multiple times at different measurements. Sometimes a huge midrange suck out, sometimes the tweeter rolled off steeply at 5K. Wacky. Or my inexperience is showing. Maybe something is intermittent and I haven't tracked it down yet. So I show the good readings not the great readings, too unbelievable. I also don't show the really fantasy crappy readings. I hope I figure it out soon.



                    My sub FR may look a little goosed because with 2 main speakers playing I think they add about 3db to all frequencies above 100hz. I may end up with reversed polarity when I go back to 2 main speakers so it adds a bit more bass for taste.
                    http://www.nytimes.com/2010/10/14/bu...html?src=busln

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

                    Comment


                    • Re: Flex Your PCD Mettle:

                      Particularly if you're using a laptop, try disabling the Wifi and Bluetooth adaptors in it. The drivers in some of them can cause all sorts of interference and stuttering in audio streams.
                      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

                      Comment


                      • Re: Flex Your PCD Mettle:

                        Will this thread never die? The horse is dead, it's bones are fossilized...

                        Lou's Speaker Site [speakers.lonesaguaro.com]
                        "Different" is objective, "better" is subjective. Taste is not a provable fact.
                        Where are you John Galt? I may not be worthy, but I'm ready.

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                        • Re: Flex Your PCD Mettle:

                          Originally posted by LouC View Post
                          Will this thread never die? The horse is dead, it's bones are fossilized...
                          Not Yet! I wanna see how the views column handles 100,00...:p

                          Comment


                          • Re: Flex Your PCD Mettle:

                            Great thread.
                            Attached Files
                            http://www.nytimes.com/2010/10/14/bu...html?src=busln

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

                            Comment


                            • Re: Flex Your PCD Mettle:

                              Skywave-Rider:
                              Originally posted by Skywave-Rider View Post
                              If you can't replicate the results, excepting maybe for very LF when a truck rumbles by, then you have issues. I had that problem measuring in SoundEasy. So I gave up on that and went with different measuring software. If you don't change anything, and you're getting variable results, you might have some software problems as I did, or maybe intermittent switching in your system.
                              PS, get behind the mic and don't move around when measuring. : )

                              bwaslo:
                              Particularly if you're using a laptop, try disabling the Wifi and Bluetooth adaptors in it. The drivers in some of them can cause all sorts of interference and stuttering in audio streams.
                              ::::::::::::::::::::::::::::::::::::::::::::::::

                              I learned not to move around except to move my finger to click the mouse!
                              Still got highly variable readings.

                              So I think the software idea and bwaslo's idea of disabling things will be tried next.

                              I think I had too many other programs running at the same time. I'll try just Holmimpulse alone and see if I get better results.

                              Thanks!

                              Also played around with one third octave smoothing and my FR looks good enough for marketing purposes! What a joke.

                              Comment


                              • Re: Flex Your PCD Mettle:

                                Originally posted by rudyjakubin View Post
                                Not Yet! I wanna see how the views column handles 100,000...:p
                                We are pikers here; the main thread on AK is pushing a million views for its third anniversary. :D

                                Originally posted by LouC View Post
                                Will this thread never die? The horse is dead, it's bones are fossilized....
                                Congratulations!! You scored Post #1001 -- thank you for your contribution. ;)

                                This thread is alive and well; hundreds of DIYers all over the world are designing and building EconoWaves according to the precepts documented here. Its role as a reference resource is reflected in the view count.

                                [There are at least three Mini-Ewaves that'll be migrating into "prime time" here shortly.... ]

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