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How low can I / should I cross the MDM55?

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  • How low can I / should I cross the MDM55?

    Scored a pair pretty cheap on eBay. Have you guys heard these crossed low? How low and how do they handle it?

    Dan
    _____________________________
    Tall Boys
    NRNP Computer Sub
    The Boxers
    The Hurricanes
    The Baronettes
    Conneccentric
    UX3

  • #2
    Re: How low can I / should I cross the MDM55?

    800hz would be about the lowest I believe. Maybe 650hz. As I recall, the response drops like a brick on the low end. That combined with the baffle effects will pretty much limit it. Rick Craig or Wolf would be the guys to ask. I had a pair about ten years ago, so I'm going on old memories.

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    • #3
      Re: How low can I / should I cross the MDM55?

      Rick Craig xoverd the Cantilena about 1k.
      Bob Cordell xoverd at about 1.2k.
      I think 900+ was where most were preferable, and 800 at the maximum lowest.

      Later,
      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


      • #4
        Re: How low can I / should I cross the MDM55?



        "I just use off the shelf textbook filters designed for a resistor of 8 ohms with
        exactly a Fc 3K for both drivers, anybody can do it." -Xmax

        Comment


        • #5
          Re: How low can I / should I cross the MDM55?

          In my canTiLenas, the MDM55 is crossed at ~750-780 Hz, and even though I've seen suggestions, perhaps actual uses, it can be crossed at 500 Hz, that's too low.
          Paul

          Originally posted by Wolf View Post
          Rick Craig xoverd the Cantilena about 1k.
          Bob Cordell xoverd at about 1.2k.
          I think 900+ was where most were preferable, and 800 at the maximum lowest.

          Later,
          Wolf

          Comment


          • #6
            Re: How low can I / should I cross the MDM55?

            Originally posted by Paul K. View Post
            In my canTiLenas, the MDM55 is crossed at ~750-780 Hz, and even though I've seen suggestions, perhaps actual uses, it can be crossed at 500 Hz, that's too low.
            Paul
            My apologies. I thought sure it was 950 in the Cantilenas.

            And I don't think I would recommend lower than 800 for any use.
            Later,
            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


            • #7
              Re: How low can I / should I cross the MDM55?

              No problem, Ben. With an Fs of 380 Hz and an Xmax of 1mm peak, crossing below twice its Fs isn't a good thing.
              Paul

              Originally posted by Wolf View Post
              My apologies. I thought sure it was 950 in the Cantilenas.

              And I don't think I would recommend lower than 800 for any use.
              Later,
              Wolf

              Comment


              • #8
                Re: How low can I / should I cross the MDM55?

                Cool guys, thanks. I was hoping to hear around 800Hz, anecdotally and that sounds about what I've got. Thinking I'll make the baffle to get a little diffraction peak around 800Hz before rolling off and cross her over right about there.

                Dan
                _____________________________
                Tall Boys
                NRNP Computer Sub
                The Boxers
                The Hurricanes
                The Baronettes
                Conneccentric
                UX3

                Comment


                • #9
                  Re: How low can I / should I cross the MDM55?

                  The MDM55 is a great driver when it's crossed properly and performs very well up to about 5 kHz. In my canTiLenas it's mated with a Fountek Neo CD1.0 and crossed at~ 4.8 kHz. There is something very magical about this mid/tweet combo. Good luck with your project.
                  Paul

                  Originally posted by DanP View Post
                  Cool guys, thanks. I was hoping to hear around 800Hz, anecdotally and that sounds about what I've got. Thinking I'll make the baffle to get a little diffraction peak around 800Hz before rolling off and cross her over right about there.

                  Dan

                  Comment


                  • #10
                    Re: How low can I / should I cross the MDM55?

                    Originally posted by Paul K. View Post
                    The MDM55 is a great driver when it's crossed properly and performs very well up to about 5 kHz. In my canTiLenas it's mated with a Fountek Neo CD1.0 and crossed at~ 4.8 kHz. There is something very magical about this mid/tweet combo. Good luck with your project.
                    Paul
                    I have a Neo X 1.0 that I'll use on top. The only problem is I have the silver face tweeter. I might have to see if I can pull the face off and paint it unless someone wants to swap me for a black face model.

                    Dan
                    _____________________________
                    Tall Boys
                    NRNP Computer Sub
                    The Boxers
                    The Hurricanes
                    The Baronettes
                    Conneccentric
                    UX3

                    Comment


                    • #11
                      Re: How low can I / should I cross the MDM55?

                      Originally posted by Wolf View Post
                      My apologies. I thought sure it was 950 in the Cantilenas.

                      And I don't think I would recommend lower than 800 for any use.
                      Later,
                      Wolf
                      I agree.
                      craigk

                      " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

                      Comment


                      • #12
                        Re: How low can I / should I cross the MDM55?

                        I crossed it at 900 Hz in my Agendas project. Working with it again in my Cumbres project and will cross right about 900 again.
                        Craig

                        Comment


                        • #13
                          Re: How low can I / should I cross the MDM55?

                          Originally posted by PWR RYD View Post
                          I crossed it at 900 Hz in my Agendas project. Working with it again in my Cumbres project and will cross right about 900 again.
                          They were really nice in your Agendas
                          craigk

                          " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

                          Comment


                          • #14
                            Re: How low can I / should I cross the MDM55?

                            Agreed!
                            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


                            • #15
                              Originally posted by Paul K. View Post
                              Re: How low can I / should I cross the MDM55?

                              The MDM55 is a great driver when it's crossed properly and performs very well up to about 5 kHz. In my canTiLenas it's mated with a Fountek Neo CD1.0 and crossed at~ 4.8 kHz. There is something very magical about this mid/tweet combo.
                              Paul
                              This begs the question: "How *high* can I / should I cross the MDM55?"

                              Looking at the MDM55 polars, 4.8kHz seems to be awfully high in terms of dispersion. Anything above 3.0-3.5kHz really. But perhaps that gives a BBC dip in the overall power response that is quite pleasant.
                              Last edited by NiToNi; 08-07-2016, 09:38 PM.

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