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Lookee what I got! TB W8-2096...

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  • Lookee what I got! TB W8-2096...

    T/S measurements, these are REALLY damped at resonance. The first one measured a high Qes compared to the other one, and therefore the Qts is higher. I'll model both to see what I get in a bit.
    1/2/spec:


    About the driver-
    I apparently missed that this has a fiber-reinforced thermally molded polymer frame. It does say it in the ad-copy that PE placed on the product page, but the spec sheet, and main top-blurb do not. I figured the W4-1720, W5-1685, and W6-1721 all have cast aluminum frames, so this would too. I guess not. So- now that that is out of the way, it's a really stiff frame, seems pretty strong, and is both bolted and heavily glued to the front plate. The surround is a treated foam rubber type, not uncommon on TB products, and the entire rear of it is coated in a sticky clear glue. The front of the cone reminds me of the Nextel coating like the Seas drivers, or even the SB larger woofer ranges; as in it's either a very nice paper laid neatly, or a sprayed on coating of some sort. You can easily see the paper fibers from the rear of the cone. The spider is flat, with stitched-in-loops heavy gauge ribbon style tinsels, and the dustcap is basically a former cap similar to what Eminence uses.







    More to come...
    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

  • #2
    Looks well behaved at the upper end as per TB's FR response, curious to see what you get. Nice driver!
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    • #3
      Yeah- nothing by way of energy storage in the impedance curve- that's for sure.
      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

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      • #4
        I'm guessing TB chose to classify it a Midbass because it performs well a little higher than other drivers of the same size? Whatcha planning on pairing it up with Ben?
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        • #5
          Maybe they need to be pounded on to get them more closely resembling each other?
          Don't listen to me - I have not sold any $150,000 speakers.

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          • #6
            Floorstanding 2 way with some pumping bass, bottom ported? Sent from my SM-G920P using Tapatalk
            Electronics engineer, woofer enthusiast, and musician.
            Wogg Music

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            • #7
              Yeah- I will be breaking-in the higher Qes driver (1) to see if it changes much. I did give them a good flexing beforehand.

              Either way- they model similarly. The F3 is about 34/35Hz depending on which set of specs you use, when placed in 25 ltrs, vented with heavy fill tuned to 40 Hz.
              So- I have an 88dB @ 2.83V driver, that reaches 35 Hz in 25 ltrs, and it's an 8 incher! The natural rise towards the bass will also help with BSC, and the FR is supposedly good well past 2kHz. Xmax is 8.5mm.
              At 25W, this hits about 100dB, and the larger Vas model only goes past Xmax+15% below 18Hz at that level (and only by about 2mm at the most).

              By comparison:
              RSS210HF-4 in vented 28.3ltr box tuned to 30 yields an F3/10 of 26/19Hz, but the sensitivity is only about 81-82dB after baffle step. Xmax is about 9mm. Good FR to about 1.1k.
              HiVi M8N gets tuned to 35 Hz in a 34 ltr box gets almost to 30Hz F3 (33, IIRC), and is approximately the same sensitivity as the W8, but you have all of the breakup issues. Xmax is about 6mm. Good FR to about 1650Hz.

              I'm not seeing the downside....
              Smaller box
              better output
              better FR
              More Xmax than closer driver
              As good extension in a slightly smaller size
              well damped at resonance

              At the moment, I'm planning on the W2-748SG 2" Al/Mg/poly widebander in a rear mounted very shallow roundover (table-edge bit), and hopefully getting a full 35-20k with minimal parts count, and likely a xover about 1k, just looking at responses. We'll see where they like to go... The natural rolloff of both drivers lend well to a blend in this manner, since the W2 is a 0.26 Qts and starts rolloff about 2.5k, and the W8 has no breakup and rolls off on its own as well. The W2 will be in about a 1-2 ltr sealed and stuffed enclosure.

              Like I said- all conjecture,
              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


              • #8
                How come you're going with such a small cabinet? This driver looks great in 35-40L tuned to 30Hz.
                Don't waste your money on a new set of speakers, you get more mileage from a cheap pair of sneakers. Next phase, new wave, dance craze, anyways it's still rock and roll to me!

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                • #9
                  The W2 published recommendation from Bass Box is 0.1 cu ft, which is 17 cu in. How does someone go about making a box that small?

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                  • #10
                    There are 1728 (12^3) cubic inches to a cubic foot. Therefore 0.1 cu ft would be 172.8 cu in.

                    John

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                    • #11
                      Ben is looking at his MEASURED data vs the published (which is typically off from TB ime). His model looks dead on from my simulation. Going larger doesnt net enough gain to make it worth it.
                      https://www.facebook.com/Mosaic-Audi...7373763888294/

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                      • #12
                        Sorry: I meant to write 0.01 cu ft. Even Ben's measured data of 1-2 liters would put it around 100 cu in, or box maybe 5x5x4. I guess then one would be putting a small box within the main speaker enclosure?

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                        • #13
                          Just noticed that Tang Band is including this driver in a 3-way suggested design: http://tb-speaker.com/products/sug3-18#tab-98

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                          • #14
                            How the heck are they measuring Le? You measured 6 times as much Le as advertised. That's a bit disappointing.
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                            • #15
                              Not sure if they are measuring at 1k and ben tested at 10k??
                              https://www.facebook.com/Mosaic-Audi...7373763888294/

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