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Thread: Project M2 DIY Thread

  1. #661
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    Though I don't think they would make this change, my D2 drivers are genuine M2 versions (gold label with the correct part number). Is there any possibility that they would label the M2 version different from the PA version of the driver?

    I have not made the phase test on the D2 so I'll take you at your word that positive on + makes an inward motion. That would be odd for JBL in the "modern" era. While that was true of JBL product into the '90s, they did make the switch to conform with others such that positive voltage on + would be an outward motion. Those drivers that were directly replacement to legacy drivers would retain the original polarity (e.g. 2446, replaces a 2445 so it keeps the legacy polarity, likewise on a 2241 replacing a 2440 for a cone driver. A 2242, on the other hand, didn't have a legacy driver to match to so it adopted the new standard).

  2. #662
    Member sebackman's Avatar
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    Hi,

    I agree, it is a bit odd that these new drivers also seem to be "reverse polarity". Attached is the pulse response with reversed polarity, ie positive puls into negative connector. Lower is the output pulse from the amp and upper what the mic picked up. Weird.

    Name:  Pulse D2 reverse polarity.png
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    We also talked about the impedance of the D2 2430K. Here is the raw data from a DATS II impedance sweep on a brand new D2 (with M2 label). The average impedance from 512Hz to 20.643Hz is 26,99 ohms. This is without any passive components, just right out of DATS II. Data files available for those who want.

    Name:  D2 on M2 impedance.jpg
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    Kind regards
    //Rob
    The solution to the problem changes the problem.
    -And always remember that all of your equipment was made by the lowest bidder

  3. #663
    Senior Member Flodstroem's Avatar
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    Slowly progress but finally I manage to veneer the cabinets. Im working in a garage without heating and I cant work with temp below 15°C.......

    But there have been some days with warm weather and I manages to veneer both cabinets. This was my first veneering job ever so it was a little bit challenging.
    I purchaset the veneer from Oakwood And they supplied me with very great portion of walnut PB veneer. I used the hot iron method for the first time and it
    worked out excellent for me. Now there is only painting and oiling left to do and Im looking forward to do it next week
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    Flodstroem

  4. #664
    Administrator Robh3606's Avatar
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    They look great! Once you oil them up!!

    Rob
    "I could be arguing in my spare time"

  5. #665
    Senior Member Flodstroem's Avatar
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    Quote Originally Posted by Robh3606 View Post
    They look great! Once you oil them up!!

    Rob
    Thanks Rob. I have the "Danish oil" in stock. They will be much darker than they are now. Planning to paint the mid-baffle like JBL blue. If its not looking good I can always paint it black as the rest of the front baffle will be
    Flodstroem

  6. #666
    Administrator Mr. Widget's Avatar
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    Congratulations on your first veneer job... they’re looking great!


    Widget

  7. #667
    Senior Member srm51555's Avatar
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    Very nice work!

  8. #668
    Administrator Robh3606's Avatar
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    We all know just how good JBL Blue and Walnut can look!

    Rob
    "I could be arguing in my spare time"

  9. #669
    Member sebackman's Avatar
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    Nice Flodstroem!

    They sure do look nice in veneer. We did our black but when seeing your we should have done them that way. Excellent.

    Stay safe
    //Rob
    The solution to the problem changes the problem.
    -And always remember that all of your equipment was made by the lowest bidder

  10. #670
    Senior Member Flodstroem's Avatar
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    Thanks al of you for the positive comments. Today Im going to start the painting work. I think Iĺl start with the.......... blue
    Flodstroem

  11. #671
    Senior Member baldrick's Avatar
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    Looks fantastic Flodstroem!

    Maybe I get the chance to take a look/listen during the summer

  12. #672
    Senior Member Flodstroem's Avatar
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    Quote Originally Posted by baldrick View Post
    Looks fantastic Flodstroem!

    Maybe I get the chance to take a look/listen during the summer
    Absolutely baldrick. But I lack amplifiers, DSP and all round that. But we will see when things has settle down ......
    Flodstroem

  13. #673
    Senior Member Flodstroem's Avatar
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    Slow progress, but have done som painting last week.
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    Flodstroem

  14. #674
    Senior Member jmpsmash's Avatar
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    That look incredible!

  15. #675
    Senior Member jmpsmash's Avatar
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    How did you make the curved baffle for the port area?

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