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  • #16
    Re: Could someone give me a quick insight?

    Originally posted by parodielin View Post
    ... on why this is a good driver? I saw the great FR and there is a small hiccup on the impedance. It looks really cool and reminds me of Accutons.

    I've read Ray and Vance's book so I have a basic understanding of what each parameter is but I don't have a strong sense of telling this is a good one or excellent one or bad one by telling the parameters.

    What is the combination on the datasheet that surprises or enlightens you on this driver?

    Any advises are helpful. ;)
    It is hoped that the harmonic distortion is similar to the 4" midrange tested by Zaph. They share a motor design and over-all construction, but the 4" has a really nasty peak in the distortion in a range very sensitive to our ears and it is assumed to be related to cone geometry.
    Don't listen to me - I have not sold any $150,000 speakers.

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    • #17
      Re: Could someone give me a quick insight?

      Originally posted by johnnyrichards View Post
      It is hoped that the harmonic distortion is similar to the 4" midrange tested by Zaph. They share a motor design and over-all construction, but the 4" has a really nasty peak in the distortion in a range very sensitive to our ears and it is assumed to be related to cone geometry.
      Is the 4" midrange the one in the Statements? or another sandwich cone?

      Comment


      • #18
        Re: Could someone give me a quick insight?

        Originally posted by parodielin View Post
        Is the 4" midrange the one in the Statements? or another sandwich cone?
        No, it is not in the statements.
        Don't listen to me - I have not sold any $150,000 speakers.

        Comment


        • #19
          Re: Could someone give me a quick insight?

          Originally posted by johnnyrichards View Post
          No, it is not in the statements.
          I headed over Zaph's and it's Tangband W4-1757S. Just in case anyone doesn't know yet...

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          • #20
            Re: Could someone give me a quick insight?

            Originally posted by parodielin View Post
            I headed over Zaph's and it's Tangband W4-1757S. Just in case anyone doesn't know yet...
            Used in Curt C's original Mavericks I believe. Replace by SB version.

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            • #21
              Re: A TB 'big-dog' has arrived....

              FWIW, guys, I have measured impedances on the W3-1797, W4-1805, and W4-1798. All of them but the W3 have a spike in the 1-2k Range. The W3 is higher, and would still be viable as a mid.

              I'm betting the TB Zplot does not show the resonance, as the drivers I tested did not have the resonance on the impedance plot from TB that I got. It was in a higher magnitude than spec.

              I heard the Mavericks, with the newer revision of the 1757 driver last year at Iowa. Curt did not treat the blemish, because off-axis it wasn't even there. AND- it was not audible to me.

              Listening to tones on them, or even just music, you can see that it will need comped on-axis. However, the distortion might not be bad enough that you have to suppress it into oblivion. Maybe just a bit below nominal level, and you'll be fine. It's not sounding like a dip at all on the ones I measured. It sounds like an outstanding peak.

              Since zaph's plot shows it as a strong magnitude in a single location, I can't see why this is not easily resolved. And the peak for the 6.5" might not even be on the plot to know where its location is.

              As to the diaphragm- it looks like a flat honeycomb circle with aluminum-foil bonded on both sides. Really light, and really stiff.

              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:
              https://app.photobucket.com/u/wolf_teeth_speaker

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

              Comment


              • #22
                Re: A TB 'big-dog' has arrived....

                Could such flat face drivers help reduce the typical MTM cavity effect frequency response wiggle? If so, maybe they'd be useful that way for WMTM designs.

                Comment


                • #23
                  Re: A TB 'big-dog' has arrived....

                  I may be finding out that info soon...
                  ...but not with the 'big dogs'.

                  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:
                  https://app.photobucket.com/u/wolf_teeth_speaker

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

                  Comment


                  • #24
                    Re: A TB 'big-dog' has arrived....

                    Got a little info from TangBand... Here are Off-axis and HD plots for :

                    W6-1916
                    W6-1914S
                    W3-1878

                    I got the others because they looked interesting and I love those bamboo cones. Unusual phase plug too.

                    Here ya go...



                    W6-1916






                    W6-1914S






                    W3-1878

                    Comment


                    • #25
                      Re: A TB 'big-dog' has arrived....

                      Any idea how the 1850 and/or the 1798 compare to the 1757?

                      1757: http://www.parts-express.com/pe/show...number=264-881
                      1850: http://www.parts-express.com/pe/show...number=264-890
                      1798: http://www.parts-express.com/pe/show...number=264-889
                      "...this is not a subwoofer" - Jeff Bagby ;)

                      Comment


                      • #26
                        Re: A TB 'big-dog' has arrived....

                        The larger you get, the lower the 'blemish' comes into play. These all have that resonance issue I've mentioned before.
                        The 1805 has the least Xmax and I would not use it myself for that reason alone. The 1757 sounded great in the 'Mavericks' CurtC designed.
                        I used a quad of W4-1798S in my 'Glucinium Amor' MTM's. Very clean, articulate, and wonderful.

                        The front half of the frame on the 1757/1805 is aluminum, the 1798 only has a ring of aluminum screwed to the polymer frame.

                        What else you wanna know?
                        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:
                        https://app.photobucket.com/u/wolf_teeth_speaker

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

                        Comment

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