Build Thread: SMJ-40 PE MOD X

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  • technodanvan
    Super Senior Member
    • Nov 2009
    • 1051

    Build Thread: SMJ-40 PE MOD X

    We'll need the marketing guys to come up with a suitable name for this one. I'm not sure "Saint-Saëns Technodanvan Edition" rolls off the tongue any better, so we're stuck with this for now. At least it's descriptive, if one were following JonMarsh in the original thread. In any case, I have begun the initial work on a set of SMJ-40s that feature only those parts available from Parts Express. So to be clear, here's what I'm using:

    2x GRS PT2522C-4 3-1/2" Planar Tweeter with Back Cup plus face plate, MODified by Jon with an extended back cup (I state MOD X as I might try several before settling on one)
    2x GRS PT5010-8 10" Planar Mid/Tweeter plus face plate
    8x Dayton Audio RSS210HF-4 8" Reference Series Subwoofers
    8x Dayton Audio RSS265-PR 10" Reference Series Aluminum Cone Passive Radiator

    Jon has discussed the MOD variants of the PT2522C in his thread so I won't go into that. The main difference here is the use of Dayton Audio passive radiators in place of the Seas SL26R. I did this for a few reasons, but the two that stand out are price and appearance. The Seas likely has better linear performance that the Dayton, however I think the audible difference will be small (at least to my ears).

    Cabinet construction will likewise be of more common materials in an aim to keep costs lower. The baffles will be 3x18mm Baltic Birch plywood, with all sides being a laminate of 18mm Baltic Birch and 1/2" MDF. I will probably mirror Jon's efforts with the phenolic plates and such as that seems integral to the design. The entire visible exterior will be Baltic Birch, so I'm thinking I might just go simple and clearcoat the whole thing...perhaps with a few hardwood inlays here and there if I have time. We shall see.

    As I often do, I have enlisted one Steve Manning to assist me with the baffles. We're doing something a little different than Jon did, and it's going to require a CNC (and skills) I do not have.

    Finally, in addition to the Crescendos I'm working on side by side with this, I'm hoping to take these with me to IowaDIY this year - that is, if Jon isn't going himself! In addition to praying I have enough time to finish everything, this also assumes I have enough room in my van to safely transport two sets of enormous speakers ~3,000 miles round trip.

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    - Danny
  • technodanvan
    Super Senior Member
    • Nov 2009
    • 1051

    #2
    First note regarding the Dayton passive radiators. Jon sent me his initial Unibox files demonstrating what they are capable of. After playing around with it I can say that the large volume we're talking about is very forgiving - different tuning weights and minor variations in volume result in very small changes to the output. Should be easy to recreate the model.

    Edit: This is roughly what Jon's original plans show. 100w to the lower cab looks to be the maximum for sub 30 Hz bass.

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    Last edited by technodanvan; 02 May 2024, 08:57 Thursday.
    - Danny

    Comment

    • theSven
      Master of None
      • Jan 2014
      • 1422

      #3
      Love seeing another built thread here on the forum! I plan on having Steve helping me with the SMJ-40 build too. However I have a center channel to complete first... Then after that I can get in the queue again. Exciting to see how this build goes.
      Painter in training

      Comment

      • JonMarsh
        Mad Max Moderator
        • Aug 2000
        • 15315

        #4
        Well, ya know, with two cabs, knocking on the door of 110 dB, should make most folks happy and set off your Apple Watch dangerous sound pressure warning!

        😮
        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

        • JonMarsh
          Mad Max Moderator
          • Aug 2000
          • 15315

          #5
          Finally, in addition to the Crescendos I'm working on side by side with this, I'm hoping to take these with me to IowaDIY this year - that is, if Jon isn't going himself! In addition to praying I have enough time to finish everything, this also assumes I have enough room in my van to safely transport two sets of enormous speakers ~3,000 miles round trip.
          I'll give you first crack at that... I think I could get these into my FJ Cruiser, by myself, but it wouldn't be trivial!
          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


          • technodanvan
            technodanvan commented
            Editing a comment
            If you like Jon, you can pick the music with which to demo these. Last year they played a four minute clip of 'house' tracks, then a four minute clip of 'builder/designer' tracks. I'll be using...nonstandard...music for the Crescendos.
        • JonMarsh
          Mad Max Moderator
          • Aug 2000
          • 15315

          #6
          Ah, don't you love the smell of panels laminating in the springtime?

          I'm still in the process of re-arranging my work space to enable working space for the big panels...

          Click image for larger versionName:	fetch?id=953174&d=1714604659.jpgViews:	0Size:	3.02 MBID:	953186
          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


          • technodanvan
            technodanvan commented
            Editing a comment
            This is a problem for me too. The heat is coming (I mean, it's already in the 80s here) and I want to have enough room in the garage for the van. Competing priorities...need more garages.
        • JonMarsh
          Mad Max Moderator
          • Aug 2000
          • 15315

          #7
          Need more garages? I can relate- theoretically a 4 car garage (one lane double deep) but too much stuff. Moving the bikes around, but expect to be bringing back one more pretty soon, assuming the new battery arrives on time, and it starts back up. (it will be trailered, but have to get it into the trailer by myself!

          This is my "Goldie oldie"- a '98 VFR800 I bought new - you guessed it, back in '98! It's a great around town bike, especially since I got the Corbin seat for it and found a really cool magnetic strap securing matching tank bag!

          Trying to close out this storage unit by the end of the month and take $650 off my monthly bills! CA is 3-4x more expensive than Idaho for storage. But then, I'm regularly paying close to $7 a gallon for gas in CA on my recent trips, and they have multiple refineries there! No refineries in Idaho, but at Costco I'm often under $4 a gallon! Go figure...


          Click image for larger version

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          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

          • Browncoat
            Senior Member
            • Oct 2016
            • 131

            #8
            Love the gear-driven cam VFRs.

            Comment

            • JonMarsh
              Mad Max Moderator
              • Aug 2000
              • 15315

              #9
              Yup! Wish my VFR1200 had that, too!
              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

              • technodanvan
                Super Senior Member
                • Nov 2009
                • 1051

                #10
                Originally posted by JonMarsh
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                Beautiful color! One we may see again quite soon...
                - Danny

                Comment


                • JonMarsh
                  JonMarsh commented
                  Editing a comment
                  Hints! Always with the hints! ;^)
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