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Morel 378 FRD / ZMA file availabilty?

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  • Morel 378 FRD / ZMA file availabilty?

    Does anyone know where I could source the FRD/ZMA's for this driver before I take the fun approach of tracing the curves and going it that route?

  • #2
    Here are my 'fptrace' version of the files, but unless the files are measured with the tweeter mounted on the same sized baffle as yours, they won't be accurate anyway. I used the 'official' graph provided by Morel - which may or may not be accurate.

    I didn't use them to design a crossover, rather, to model an existing and proved design from MTM to TM.

    Excellent tweeter, by the way

    Geoff
    Attached Files

    Comment


    • zinger084
      zinger084 commented
      Editing a comment
      thanks for sharing. i traced too... i'll see how they compare to yours.

      yes, i have some smaller morels in the other room and they've been great performers.

  • #3
    Be advised the impedances may not match between them as the pair I have do not. The curves start in the same places, but the magnitudes are different.

    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


    • Geoff Millar
      Geoff Millar commented
      Editing a comment
      That's interesting, thanks: would the differences be enough to affect the sound?

      Geoff

    • zinger084
      zinger084 commented
      Editing a comment
      making me want to get PE DATS unit i've heard others using on this forum... i think it can do RLC and impedance...

    • Wolf
      Wolf commented
      Editing a comment
      If you comp the Fs, whatever the reason, you'll need different values in their respective networks.
      Wolf

  • #4
    Try these FPTraced files (Geoff's don't look good to me - the SPL is waay off?).
    277-084.FRD
    277-084.ZMA

    Comment


    • Geoff Millar
      Geoff Millar commented
      Editing a comment
      Thanks Chris, those look much better - I'll use them in future

      Geoff

  • #5
    My measured impedances, and a spec-FR with added tail.
    Wolf
    Attached Files
    "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


    • Geoff Millar
      Geoff Millar commented
      Editing a comment
      Thanks Wolf, will check them out

      Geoff

  • #6
    Any open designs for cat378 mtm's out there ?

    i have 4 tweets collecting time in my closet.


    I'd had luck running it with the 5.6uf cap slid back 2-3" with an eminence b102 (run wide open), but have been curious for perhaps cleaner mids.

    2khz crossover point is rough for a 6.5" mtm, but i sit 10' away.........

    Comment


    • #7
      No idea what this sounds like, but I've built Mr Chua's "Lark SM" and really like them. He's very friendly, approachable and cabinet details/crossover details are available on request:

      https://ampslab.com/blog/2018/02/28/raven-cat-1/

      CAT378, RS180P, DA270

      Geoff

      Comment


      • #8
        You are right, he is nice and does share.

        i have that one, the raven cat 2-way..
        i have another one also, thrush i think.

        maybe the scanspeak classic redo of the vifa p17 can work (mtm).
        the 8 ohms would give a squeek of baffle step area, while the 2 x 4ohms in series, i would have to get away from the simplicity of 5.6uf cap on morel making 92db and -6db at 2khz, and -12db at 1khz........

        Comment


        • #9
          just thought i'd share this... i got my DATS unit a few days ago and measured one of my three Morel 378s. the stock specs says Fs is 700... however, the first i measured Fs is 1042!
          Click image for larger version

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          Morel 378 Impedance_ZR_DATS_20220214.zma

          Comment


          • #10
            Mine were 1099 and 879. The minima above Fs is about the same on both, and starts the rise in the same place as freq decreases. However, the lower Fs model has a higher magnitude before it finally starts decreasing in stature and that is where they differ most. In terms of bandwidth where they are likely to be used, I would call them close in profile and when compensated will operate very similarly.

            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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