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Thread: After 5 years it finally begins

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  1. #1
    Member sebackman's Avatar
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    After 5 years it finally begins

    Some of you may know that the M2 hysteria was started back in 2015 when I ordered the first 2pcs JBL M2 WG's by their spare part number trough a very friendly speaker shop in Florida (they still are!) and actually got them to my very big surprise. They were the first two to be sold separately. I quickly ordered 6 more and got them too. Pure joy.

    I posted data here on LH and I think some jaws dropped in that they were actually obtainable at that point. Many have since successfully built M2’s or clones in various forms. The rest is history.

    My own WG’s have been sitting idle while seeing others build nice speakers over the years. I have supplied M2 adapters to many and assisted many builds in any way I could.

    Now its time to get my dusty WG’s in service.

    This tread will cover the original idea with replacing my current LCR system with DIY M2 Rev RoB WG’s, 1400PRO, 2451Be and 045’s.

    Just to be certain I’m also building a pair of faithful M2 clones at the same time. Maybe not that faithful, I’m going to use the -1 woofer and 4” drivers (also have D2's). More of that in a separate thread if anyone would be interested.

    Attached are some pictures and more to follow.

    Kind regards
    //RoB


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

  2. #2
    Senior Member jmpsmash's Avatar
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    nice!

    what's happening at the last photo?

  3. #3
    Senior Member srm51555's Avatar
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    Your threads are always a good read, cant wait to see the progress. Is there a reason you chose the 2216-1ís over the nondash?

    Thanks,
    Scott

  4. #4
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    Quote Originally Posted by jmpsmash View Post
    nice!

    what's happening at the last photo?
    Looks like he is scanning them in a CNC machine

  5. #5
    Senior Member pos's Avatar
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    Yes RoB, I think all of us M2 DIYers can be grateful to you

    Quote Originally Posted by sebackman View Post
    m going to use the -1 woofer and 4Ē drivers
    SL diaphragm I presume. Hmmmm, passive crossover maybe?

  6. #6
    Senior Member srm51555's Avatar
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    Quote Originally Posted by pos View Post
    Yes RoB, I think all of us M2 DIYers can be grateful to you
    Yup, both of you

  7. #7
    Senior Member 1audiohack's Avatar
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    Didnít he cut them shorter and port two of them for super tweeters? Looks like a mill op to me.

    Barry.
    If we knew what the hell we were doing, we wouldn't call it research would we.

  8. #8
    Administrator Robh3606's Avatar
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    Looking forward to see you complete them! I have been sitting on mine as well. One of these days

    Rob
    "I could be arguing in my spare time"

  9. #9
    Member sebackman's Avatar
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    Thank you for the positive comments.

    I wanted to keep the 2451Beís as the Be dias do have a nice tone but at the cost of sharp roll off in higher frequency. I would have preferred to build a 2-way system but the tests I did using the BSS DSP to flatten the curve felt like it lost the crisp in the higher segment. I can get the curve pretty good with a lot of EQ but when adding a tweeter, the treble got more clear and ďairyĒ. Even if the curves look pretty much the same. I did not experience the same with the SL diaís using required EQ for them. Odd

    I typically hate when science (measurements) and perception deviate like that. I donít believe in psychoacoustics. Be as it may, 3-way with sub it is. :-)

    Anyway, as I have the 045ís with the K2 UHF horns they will have to be used here too. Many new speakers strive after providing a point source and JBL has over the years integrated UHF units in their horns to reduce the acoustic centre distance. I decided to do the same and integrate the 045ís in the M2 WGís. Hence the CNC milling.

    This system is also wall hanged to mitigate animated discussions with other family members, so the requirement was that these are keep rather narrow. The M2 WGís are quite wide so the only way was to put the blade in them.

    Attached are some pictures. I will revert with more info over the coming days.

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

  10. #10
    Member sebackman's Avatar
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    In the CNC job we also took off the upper edge to minimize the baffle space. The 045 hornís was recessed on the side were the logo normally should go. I know they are JBLís so I donít need that 😊 .

    The next job was to make them narrower. That was a nightmare as the material these are filled with is some kind of glas/plastic mix that is a pain to saw in. I had to change the blade after each cut. And the smell is not for the fainthearted.

    I made a jig to be able to cut straight as these WGís are curved in many directions. A bit crude but it worked out just fine. They will be recessed in the new cabinets and after repainting I hope they will look factory to all but the trained eye.

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

  11. #11
    Senior Member macaroonie's Avatar
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    Our Swedish McGuyver , Great work Rob.

    Prob some mineral fill in that plastic , did you try pure carbide , 3 flute spiral downcut at a lower speed..

    M

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