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  • #31
    It's likely the 'chamber' they have at PE.

    It's basically a booth like you get into at the ENT for hearing tests, or for recording vocals. They have added the wedges to the walls, and the former window is the mic/driver interface depending on the function intended.

    Later,
    Wolf
    "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
    "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
    "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
    "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

    *InDIYana event website*

    Photobucket pages:
    http://photobucket.com/Wolf-Speakers_and_more

    My blog/writeups/thoughts here at PE:
    http://techtalk.parts-express.com/blog.php?u=4102

    Comment


    • #32
      Originally posted by jhollander View Post
      Nice anechoic chamber. So the graph above was in the chamber? Any gating? I'd love to see some detailed pics about the chamber so we could diy one...
      Originally posted by Wolf View Post
      It's likely the 'chamber' they have at PE.

      It's basically a booth like you get into at the ENT for hearing tests, or for recording vocals. They have added the wedges to the walls, and the former window is the mic/driver interface depending on the function intended.

      Later,
      Wolf
      Ben is correct, this is the chamber here in the lab at PE. Not so much a booth but an actual room (~1500 cuft) with a non treated floor. It's good to around 450 Hz and yes that distortion was gated at 5ms. We usually blend our FR curves for spec sheets around 500-600 Hz. The tweeter for this test was about 61" off the floor on two stands stacked.

      I have attached frd and zma files for anyone who wants to fiddle. Everything is 2.83V/1m, woofer is blended to nearfield at about 720 Hz.

      Epique Woofer.zma
      TL Tweeter.zma
      Woofer 0deg.frd
      Tweeter 0deg.frd
      Your results may vary.

      Comment


      • #33
        Nice, might play if you have the T+W file...
        John H

        Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

        Comment


        • #34
          Originally posted by jhollander View Post
          Nice, might play if you have the T+W file...
          Sorry John, if you are asking for a different file than I posted I'm not sure what that would be. Can you elaborate?
          Your results may vary.

          Comment


          • #35
            Matt I would need the T+W file to be able to find the offsets between the drivers.
            John H

            Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

            Comment


            • #36
              Wow! That's awesome, man!

              Comment


              • #37
                That's bigger than it used to be then.
                Wolf
                "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                *InDIYana event website*

                Photobucket pages:
                http://photobucket.com/Wolf-Speakers_and_more

                My blog/writeups/thoughts here at PE:
                http://techtalk.parts-express.com/blog.php?u=4102

                Comment


                • #38
                  Beautiful work.

                  Comment


                  • #39
                    Originally posted by mattp View Post



                    Ben is correct, this is the chamber here in the lab at PE. Not so much a booth but an actual room (~1500 cuft) with a non treated floor. It's good to around 450 Hz and yes that distortion was gated at 5ms. We usually blend our FR curves for spec sheets around 500-600 Hz. The tweeter for this test was about 61" off the floor on two stands stacked.

                    I have attached frd and zma files for anyone who wants to fiddle. Everything is 2.83V/1m, woofer is blended to nearfield at about 720 Hz.

                    [ATTACH]n1419249[/ATTACH]
                    [ATTACH]n1419250[/ATTACH]
                    [ATTACH]n1419251[/ATTACH]
                    [ATTACH]n1419252[/ATTACH]
                    This was fun playing with. My x-over uses a lot of parts to smooth some bumps. Probably isn't practical, but If you like big x-overs.....

                    Click image for larger version

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                    Comment


                    • #40
                      Quick question for anyone who has used TL N26CR2-A tweeters in the past (I don't think there are many...)

                      Due to the peak in the woofer, in order to get away with a minimal-component XO with no notch these really want to be crossed around 1300 Hz second order. Is this a safe XO for these tweeters? My listening tests don't show any real strain even at higher levels but I know these are fragile and I realllllly don't want to literally break one.

                      John Hollander has been graciously helping me get these as good as I can get and proposed asking anyone that has used them before. Here is the first sim he came up with. I have only listened to this one so far. I do not see any issues in the distortion plots at all... and nothing is shouting at me during listening tests.

                      Click image for larger version

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                      Your results may vary.

                      Comment


                      • #41
                        Actual measurements. Distortion was taken at 5v with 1/24 smoothing.


                        Top is overall, bottom is tweeter only with XO.

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                        Last edited by mattp; 08-17-2019, 02:19 PM. Reason: Smoothing ratio was wrong.
                        Your results may vary.

                        Comment


                        • #42
                          For anyone curious this is 0-45 degrees.

                          Click image for larger version  Name:	 Views:	1 Size:	16.3 KB ID:	1419600
                          Your results may vary.

                          Comment


                          • #43
                            Since I cannot edit my other post...here is overall measured with individual driver roll-offs.

                            Click image for larger version

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                            Your results may vary.

                            Comment


                            • #44
                              I would still likely place an LC across the woofer and see if you can't get to -50dB on the breakup. As low HD and resolving these should be, I would remove all doubt and kill that blemish. This also might allow you to shift the xover higher, as I think Xmax could be your issue, not HD. I would try some higher output with xover and see, but 1500+ w/o waveguide is probably recommended. I have a set of TL, but not that model.
                              Wolf
                              "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                              "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                              "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                              "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                              *InDIYana event website*

                              Photobucket pages:
                              http://photobucket.com/Wolf-Speakers_and_more

                              My blog/writeups/thoughts here at PE:
                              http://techtalk.parts-express.com/blog.php?u=4102

                              Comment


                              • #45
                                And a cap of about 1uF across your padding resistor will lift the top.
                                Wolf
                                "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                                "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                                "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                                "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                                *InDIYana event website*

                                Photobucket pages:
                                http://photobucket.com/Wolf-Speakers_and_more

                                My blog/writeups/thoughts here at PE:
                                http://techtalk.parts-express.com/blog.php?u=4102

                                Comment

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