SMJ's Modula is combined with a phenolic cabinet

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  • letiennam
    Member
    • Mar 2016
    • 65

    #1

    SMJ's Modula is combined with a phenolic cabinet

    Hello,
    After having been a rather silent reader or only built speakers, now I would like to try my hand at a small project. I have built myself and share the progress with you guys, I would be very happy to receive feedback and help welcome
    The adenture to build a new loudspeaker began with a clear targets:
    1. Based on SMJ's Modula design for the MW19P and DA25TX, the cabinet was redesigned into a rectangular box, primarily to reduce the speaker's depth to better fit my family's living room.
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    2. I've always felt the front panel of the DA25TX is flimsy and not very sturdy, so I plan to modify it. The goal is to reduce the diameter while maintaining the front panel shape; and increase the thickness of the screw mounting area.
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    3. Creating a rigid, resonance-free cabinet that would let the drivers perform at their best. The initial concept centered on using Phenonlic for the enclosure walls, chosen specifically for its exceptional stiffness and inherent damping properties to significantly reduce unwanted cabinet vibrations and coloration.
    Inside the enclosure, an elaborate network of strategically placed internal partitions and braces was designed to improve the dynamic performance while maintaining proper volume for the bass alignment.
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    Below are pictures of the speaker cabinet design. One detail not shown in the drawing is the placement of the port. Since my living room isn't ideal, it's small. To solve that problem, I need to reduce the distance between the speakers and the back wall while still having good bass. So my idea for the speaker enclosure is a reflex type with the port located at the bottom.
    I admit that I referenced the idea from the Purifi SPK16 DIY Kits. The drawings were created for a local CNC service provider to execute. The phenolic panels have been purchased; I will update the progress in the next few days.
    Attached Files
  • technodanvan
    Super Senior Member
    • Nov 2009
    • 1519

    #2
    This looks wonderful! Did I miss the MW19P/DA25TX Modula design somewhere? Sounds like a killer pairing.
    - Danny

    Comment

    • letiennam
      Member
      • Mar 2016
      • 65

      #3
      Happy Father's Day from Vietnam!!!
      Yesterday was Sunday, and also the longest day of the year, so I had time to spend with my speakers.
      First, my target is to modify the front panel of the DA25TX.
      I ordered CNC machining and black anodizing for 3 of my designs.
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      Phew, they fit perfectly and look quite nice after installation.
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      This photo shows that the front panel has become smaller and has a better thickness.
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      Then, replace them with a different type of screw to reduce the screw height.​
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      ​Finally, I chose this design.
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      Last edited by letiennam; 22 June 2026, 05:14 Monday. Reason: remove the attached files

      Comment


      • Steve Manning
        Steve Manning commented
        Editing a comment
        Very nice look on the new tweeter faceplates!

      • technodanvan
        technodanvan commented
        Editing a comment
        Those look stellar!

      • JonMarsh
        JonMarsh commented
        Editing a comment
        This is a very nice effort and result at "upgrading" the excellent DA25TX Peerless tweeter!
    • letiennam
      Member
      • Mar 2016
      • 65

      #4
      Before receiving my parts to assemble, I took the time to fit the panels together.
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      ​​​
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      Comment

      • Steve Manning
        Moderator
        • Dec 2006
        • 2129

        #5
        Originally posted by technodanvan
        This looks wonderful! Did I miss the MW19P/DA25TX Modula design somewhere? Sounds like a killer pairing.
        Danny this design is based on the SMJ Calliope
        Hold on to your butts - It's about to get Musical!



        WEBSITE: http://www.smjaudio.com/

        Comment

        • JonMarsh
          Mad Max Moderator
          • Aug 2000
          • 16072

          #6
          I am "cheating" getting some advance info from Leteinnam on the results, but it seems to be working out very well- only advice is to try stuffing the whole cabinet lightly to reduce what is most likely the port upper resonance at 150Hz, as he measures from DATS.
          the AudioWorx
          Natalie P
          M8ta
          Modula Neo DCC
          Modula MT XE
          Modula Xtreme
          Isiris
          Wavecor Ardent

          SMJ
          Minerva Monitor
          Calliope
          Ardent D

          In Development...
          Isiris Mk II updates- in final test stage!
          Obi-Wan
          Saint-Saëns Symphonique/AKA SMJ-40
          Modula PWB
          Calliope CC Supreme
          Natalie P Ultra
          Natalie P Supreme
          Janus BP1 Sub


          Resistance is not futile, it is Volts divided by Amperes...
          Just ask Mr. Ohm....

          Comment

          • letiennam
            Member
            • Mar 2016
            • 65

            #7
            Last night, I had time to asemble the speaker cabinet.
            I was really curious about what it would sound like, so I installed the speaker driver and there was almost no damping material inside.
            As Jon revealed, after measuring with DATS v3, my idea was to check Fb to see if I had calculated correctly. It's not surprising that there's a small beep on the impedance curve at around 150Hz. But the listening experience is good in the mid and high ranges. I particularly liked how the DA25TX performed in the high frequencies; it was very similar to what I heard with my Beyerdynamic T1 gen 2 headphones.​
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            Below is a picture of the speaker driver after it has been installed into the front panel.

            I named it Concept One. Because after the local CNC service provider had almost finished cutting, I suddenly thought, why don't I make an extra compartment after the back panel? It would be much easier to change when upgrading the capacitors. Anyway, what's done is done.​

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            Comment

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