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Thread: Passive Monitor Thread

  1. #16
    Senior Member Ed Zeppeli's Avatar
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    Ha. Keep us posted!
    DIY Array, 2242 sub, 4408, 4208, Control 8SR, E120 Guitar cab, Control 1, LSR305.

  2. #17
    Senior Member srm51555's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Now I get to start all over again with the right M2 waveguides!

    Rob
    Good for you Rob. Were you planning on building the M2 cabinet as is or something different?

  3. #18
    Senior Member pos's Avatar
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    So you are going to build a passive M2?
    That together with Mr Widget's cabinet design, JBL consumer will have some inspiration to draw from you guys

  4. #19
    Senior Member JuniorJBL's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Now I get to start all over again with the right M2 waveguides!

    Rob
    That should be a fantastic system Rob!!

    I am still waiting on my 2216's but my horns came!!

    I am going down your path as well with my 476Mg's. I do however plan to use a DSP with my levinson 331 and 333 for the top and bottom.

    What will you power yours with? Will you do DSP or just passive?

    Your projects always turn out nice so this is exciting to see!!
    Always fun learning more.......

  5. #20
    Administrator Robh3606's Avatar
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    Hello guys been a while. The plan is to try a passive version see what happens. It's a no brainer that the DSP route is really the way to go as it's a done deal. I am really curious about how the horn/waveguide will measure with the 435Be and the 476Mg. As far as the cabinet same volume not sure on the tuning and the look will be different. This is going to be an evolving project so nothing is written in stone. It will be fun to do no matter what the outcome. I can always fall back to turnkey if I can't get it to work.

    With any luck I can post some raw measurements soon and the impedance curve on the waveguide. Going to be a real PITA to mount the 476mg. I modified the plates to take #10 flatheads and put helicoils in the waveguides so I can play with the plates and not wear out the threads.

    Rob
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  6. #21
    Senior Member grumpy's Avatar
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    put helicoils in the waveguides
    you read my mind looking forward to measurements.

  7. #22
    Administrator Robh3606's Avatar
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    Just did a quick point and shot to see what the M2 measures like with a 2435Be. Well I will be damned I was able to take an existing nework simulation with a crossover for the PTH1010 and tweeked it a bit. It isn't perfect notch at 2.5K but I am delighted how similar the raw measurements were between the 2 waveguides. I find this really encoraging can't wait to try a 476Mg

    First one is on the M2 second is on the PTH1010.

    The Clio is raw the red is the M2.



    Rob
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  8. #23
    Senior Member pos's Avatar
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    Interesting!
    So same "problem" with the phasing plug and horn throat interaction in the UHF.
    Maybe you could try adding a little tube like in the the 2432, using something like a 1" MDF plate?

  9. #24
    Administrator Robh3606's Avatar
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    Hello pos

    If you overlay them it seems to be a bit better. Green is the M2.

    Rob
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  10. #25
    Senior Member ivica's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Just did a quick point and shot to see what the M2 measures like with a 2435Be. Well I will be damned I was able to take an existing nework simulation with a crossover for the PTH1010 and tweeked it a bit. It isn't perfect notch at 2.5K but I am delighted how similar the raw measurements were between the 2 waveguides. I find this really encoraging can't wait to try a 476Mg

    Rob
    Hi Rob,

    I would expect that 476Mg would perfectly match....waiting....

    ivica

  11. #26
    Administrator Robh3606's Avatar
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    Hey Guys

    Well just tried out the 476Mg on the waveguide and all had to do was tweak the existing network and it looks good. Ignore the chop up front just did a quick measurement to get an idea. Dialed right in after about 30 minutes playing in LEAP. Had to play with the series notch and change the parallel notches Q and Frequency.

    Rob
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  12. #27
    Senior Member ivica's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Hey Guys

    Well just tried out the 476Mg on the waveguide and all had to do was tweak the existing network and it looks good. Ignore the chop up front just did a quick measurement to get an idea. Dialed right in after about 30 minutes playing in LEAP. Had to play with the series notch and change the parallel notches Q and Frequency.

    Rob
    Hi Rob,

    Nice,
    I have been surprised how good is M2&476 combo under 1kHz (seems can be used from 600Hz)
    Can You show us final network version???

    regards
    ivica

  13. #28
    Administrator Robh3606's Avatar
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    Hello Ivica

    Here is a revised measurement and a copy of the schematic. Just understand this is preliminary it is likely to change once I get everything in cabinets and the try to get the transition to the woofer right. For information here you go. Has anyone measure a 2452 on this waveguide? My thinking is it should dial in very nicely. If I remember it has a similar raw curve as the 476Mg. Have to just love this driver it just goes all the way out I am getting usable response out past 20K!
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  14. #29
    Senior Member JuniorJBL's Avatar
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    That's impressive Rob!!

    Should make a fantastic system!!
    Always fun learning more.......

  15. #30
    Senior Member ivica's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Hello Ivica

    Here is a revised measurement and a copy of the schematic. Just understand this is preliminary it is likely to change once I get everything in cabinets and the try to get the transition to the woofer right. For information here you go. Has anyone measure a 2452 on this waveguide? My thinking is it should dial in very nicely. If I remember it has a similar raw curve as the 476Mg. Have to just love this driver it just goes all the way out I am getting usable response out past 20K!
    Hi Rob,

    Many thanks for the detailed presentation of M2 & 476Mg driver, with passive network applied.
    Seems to me that driver response compensation is not so difficult as can be expected if we are looking active network compensation of M2 & D2430K.
    Interesting that some 'periodic' holes in the FR,

    http://www.audioheritage.org/vbullet...l=1#post373896

    http://www.audioheritage.org/vbullet...l=1#post375970

    [ we have seen here on AH forums starting around 2.8kHz, 5,7.kHz, around 9,....kHz]
    of M2 & 2450-1.5Be(Trex) is not present here on your measurements.

    regards
    ivica

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