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I theorize: "Hybrid Vigor", a stress-reduction for the DF/M3N..

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  • I theorize: "Hybrid Vigor", a stress-reduction for the DF/M3N..

    Initialization:
    I picked up a set of baffles at the recent InDIYana 2017 event that were free from whatever source, but that's not important. Anyway- the woofer cutout is perfect for the RS125-4, which I have an extra set of. (These woofers are the same ones Matt and I separated the former from spider during 'In the Air Tonight' back in 2012. I was able to repair them with Aileene's Tacky Glue.)
    And the tweeter rebate is 94mm, so it has some interesting drivers to fit. I figure 4mm difference isn't too bad, and the 90mm HiVi M3N will fit with just a bit of play around the perimeter.

    Placements...




    Name?
    The name Hybrid Vigor is used to define hybrids of use in a lot of the markets in life. Roses that smell sweeter, seedless grapes, mules with more strength than donkeys and better dispositions; so- I get a sweeter midrange, better disposition, and still have the kick of a mule. To 'kick like a mule' is to remain an aspect of this project, but to also do it with a little more ease. I just hope to keep it from sounding chesty.

    Why?
    I've missed the Dragon Foals since I traded them off for other goods a long time ago. The midrange was just sooo nice, even if the widebander became stressed at higher outputs. This addition of a woofer reduces the strain on the M3N, while adding a true woofer won't lose too much sensitivity as a full system. The RS125-4 is also a pretty sensitive unit to start with, so full comp (or even overcomp) is possible.

    How?
    8 ltrs total volume, so it's just a touch larger than twice that of the DF. The RS125-4 in 6 ltrs is not as flat in response as in the Stance project, but I'm looking to infer the same relative spectral response as in the DF in this particular case. Tuning the 6 ltrs to 64Hz with a 2.0"D x 7.5" long port, yields an F3/10 of 53/45Hz. Lined walls, and a bit of stuffing finish off the enclosure.




    The M3N in 2 ltrs, composing a very leaky box via a small aperiodic-vent, fully stuffed, and a 1" port x 1.3" long, yields what I found to be a very gradual rise in Xmax as frequency decreases below about 400Hz. With the passive highpass in place, this will be reduced pretty much in its entirety, but I wanted the box to be able to control the driver under higher output conditions with a somewhat logarithmic damping approach. This way the driver is as free as it can be in the bandwidth utilized, and the box does not come into play until about an octave below the xover point. At that range it does not immediately overshoot like in the conventional vented box below tuning. It instead takes 2 more octaves below that 400 Hz point before it even breaches Xmax at about 100Hz, the Fb of the 2 ltr box. This is of course without the xover in place, so it's better as a system.




    Simulation 1...
    So- I already had files for both drivers from the previous projects, and I set to work out a blending with a xover. I went with a gradual slope of LR2, and the phase locked in and the drivers met with a resultant Fc of about 850-900 Hz range. This keeps the M3N happy and allowed the RS125 to do its thing. Being the M3N is what it is, it does take some massaging to make it presentable, and I heavily suppressed the breakup on the RS as I've done prior for best results. The dip centered at 10k on the M3N is an FR aberration that is to be allowed if anyone wants to use it out to 20k. The plus is, it's in the right place- it's high enough to not be unobtrusive, and also in the sssibilance range to keep speech from becoming like an aural cheese-grater. I ended up specifying higher DCR coils to suppress the lowpass peaking on the RS125 at resonance. This is because the resistor method across the RS did not work well enough or with a high enough resistance value to reduce the resonance's magnitude and mitigate the issue. This was as simple as I could make it. The CR and the LCR on the M3N are portions of the dual LCR network I used in the past. I just tweaked a bit on the first one to keep the blending at the Fc presentable.

    So- here are the squiggles (2nd option adds 2 parts to flatten out the warmer midbass range)...






    Preliminary Schematic:


    Thanks for looking!
    Wolf

    photobucket page link for this project:
    http://s18.photobucket.com/user/wolf...?sort=3&page=1
    Last edited by Wolf; 05-03-2017, 12:22 PM.
    "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

  • #2
    Not all hybrids are improvements.

    Comment


    • #3
      Thanks, Mr. Obvious,
      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
        I don't know why the images are showing up for me as broken links currently, as just a bit ago, they were all live and present.
        Anybody else having this issue?
        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


        • #5
          Originally posted by Wolf View Post
          I don't know why the images are showing up for me as broken links currently, as just a bit ago, they were all live and present.
          Anybody else having this issue?
          Wolf
          I don't see any images either Mr Wolf.

          Comment


          • #6
            No images here either.

            The picture link has html at the end, not jpg, which may be a clue.
            Bill Schneider
            -+-+-+-+-
            One word = one milli-picture

            Comment


            • #7
              Originally posted by Wolf
              I don't know why the images are showing up for me as broken links currently, as just a bit ago, they were all live and present. Anybody else having this issue? Wolf
              I can see them all.
              -Kerry

              www.pursuitofperfectsound.com

              Comment


              • #8
                No pics here.
                Eric L.

                Comment


                • #9
                  I can see them also.
                  craigk

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

                  Comment


                  • #10
                    No see

                    Comment


                    • #11
                      I should also note that when I click on the thumbnails my computer locks up. Weird.
                      Eric L.

                      Comment


                      • #12
                        I also see no images.
                        Originally posted by brkitup View Post
                        I should also note that when I click on the thumbnails my computer locks up. Weird.
                        Photobucket is pretty rife with malware...

                        Comment


                        • #13
                          No pics

                          Comment


                          • #14
                            Not seeing any images here either...
                            Brian Steele
                            www.diysubwoofers.org

                            Comment


                            • #15
                              Hmmm... I clicked the share img link this time instead of the one from the actual photos, but it should be the same. I'll see if I can't get it remedied a little later...
                              Thanks,
                              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

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