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  • #46
    Don looks to me like #9 & #10 are your closest matching pair followed by #7 & #8, #3 & #11 or #12
    HAGD,
    Marc

    Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

    TMWW thread

    Maurbacs DCR Tower

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    • #47
      If you're building "Stent-a-likes" (6 drivers / enclosure), I'd suggest these 2 groups (I eye-balled your numbers off your graphs):
      Group A: 1, 4, 6, 7, 9, & 10. Averages: Fs=49, Qts=0.51, Vas=0.19cf
      Group B: 2, 3, 5, 8, 11 & 12. Averages: Fs=51, Qts=0.53, Vas=0.18
      These 2 groups will box-model about the same as each other.

      Comment


      • #48
        Thanks for the input guys!

        Stay tuned - T/S retests with Blu-Tak are coming out much different. I have new hope that this project will go forward with these drivers.

        I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
        "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

        High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
        SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
        My Voxel min sub Yet-another-Voxel-build

        Tangband W6-sub

        Comment


        • #49
          Originally posted by ecj
          The four I received are reasonably close (no break-in):
          #1 and #4 look close to being a matched pr, but would have to see T/S params to know for sure. Both those look to have an Fs near 49Hz and they both track very close at 10ohm just past 100Hz and again back to 10ohm at 800Hz, both bottom and measure same between 200-300Hz as well
          HAGD,
          Marc

          Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

          TMWW thread

          Maurbacs DCR Tower

          Comment


          • #50
            Originally posted by ecj
            The four I received are reasonably close (no break-in):
            Could see the pictures (attachments) yesterday, but not today! Noticed you edited your post this morning.
            “I cried because I had no shoes until I met a man who had no feet”

            If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

            Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

            Comment


            • #51
              So I'm almost finished with retesting - looks like the major problem was how I attached the 10G weights (2 US nickels) to the cone/dustcap.
              (BLU-TAK is the best, with the intersection of the dustcap and cone as best position)
              If I look at the units with large variations from the norm, the MMS is way off. Resting 2 and 3 times shows a more normal MMS, and then
              the rest of the parameters fall in line. Final results soon.

              I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
              "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

              High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
              SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
              My Voxel min sub Yet-another-Voxel-build

              Tangband W6-sub

              Comment


              • #52
                The four I received are reasonably close (no break-in):
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                Originally posted by thekorvers View Post

                Could see the pictures (attachments) yesterday, but not today! Noticed you edited your post this morning.
                I think I broke something while trying to resize the images.

                Comment


                • #53
                  Lots and Lots of LIMP yesterday. Got real good at applying nickels to cones.
                  Much more consistency, but a few drivers in the bunch that are definitely out of spec.

                  I tested some of the drivers 3 - 4 times, so I feel that results are good.
                  The project will move forward - sims will use the average vaiues, with out of spec drivers
                  matched left to right.

                  FS:
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                  QTS:

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                  VAS
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                  MMS:
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                  I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                  "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                  High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                  SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                  My Voxel min sub Yet-another-Voxel-build

                  Tangband W6-sub

                  Comment


                  • #54
                    Even though #2 & #6 don't match the others, if you box-model them (ave of 2&6), you'll see that they almost perfectly match the others (ave of the other 10) as far as final Vb & F3 values go. IF Qts goes up, but Fs ALSO goes up, AND Vas goes down - they end up essentially modelling the same (exactly the way your data shows).

                    Comment


                    • #55
                      Originally posted by Chris Roemer View Post
                      Even though #2 & #6 don't match the others, if you box-model them (ave of 2&6), you'll see that they almost perfectly match the others (ave of the other 10) as far as final Vb & F3 values go. IF Qts goes up, but Fs ALSO goes up, AND Vas goes down - they end up essentially modelling the same (exactly the way your data shows).

                      Yeah, I thought that was pretty instructive - text book parameter shifts.

                      I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                      "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                      High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                      SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                      My Voxel min sub Yet-another-Voxel-build

                      Tangband W6-sub

                      Comment


                      • #56
                        Originally posted by donradick
                        Lots and Lots of LIMP yesterday. Got real good at applying nickels to cones.
                        Why use the nickels at all? I usually just weigh out poster putty and mash it flat.
                        --
                        "Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)

                        Comment


                        • #57
                          Originally posted by Pallas View Post
                          Why use the nickels at all? I usually just weigh out poster putty and mash it flat.
                          good point - I try to simplify every aspect of measurements - now I just need to buy a sub .1 gram accuracy scale.

                          I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                          "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                          High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                          SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                          My Voxel min sub Yet-another-Voxel-build

                          Tangband W6-sub

                          Comment


                          • #58
                            The one I use cost under $10 on a site where PE also sells, and is very consistent though I haven't really calibrated it.
                            --
                            "Based on my library and laboratory research, I have concluded, as have others, that the best measures of speaker quality are frequency response and dispersion pattern. I have not found any credible research showing that most of the differences we hear among loudspeakers cannot be explained by examining these two variables." -Alvin Foster, 22 BAS Speaker 2 (May, 1999)

                            Comment


                            • #59
                              thanks. Very good tip! I found that the little pieces of putty that I used to attach the nickels was .6g

                              Time to repeat the LIMP tests.
                              Click image for larger version

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                              I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                              "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                              High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                              SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                              My Voxel min sub Yet-another-Voxel-build

                              Tangband W6-sub

                              Comment


                              • #60
                                Finished another round of the "out of spec" drivers, results a bit more consistent, but I've still got several drivers as outliers,
                                so I'll match those left to right and top to bottom.

                                Now it's time to look for a nice high efficiency tweeter. I got excited about the H25 / H26 tweeters, then saw the rather high Fs.
                                I figure that I'll need to crossover the tweeter about 2500, since the woofer response is a bit unknown at this time.
                                Looking to spend about $30-35 and have 93db efificiency.

                                Actually, this Vifa ring radiator looks about perfect.
                                One thing that isn't clear from the specs is how loud a tweeter could play without damage or distortion.
                                Do I need to worry about that?

                                Any other suggestions?

                                http://www.parts-express.com/peerles...eter--264-1016


                                I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                                "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                                High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                                SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                                My Voxel min sub Yet-another-Voxel-build

                                Tangband W6-sub

                                Comment

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