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Maurbacs DCR tower

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  • Maurbacs DCR tower

    Well the day has finally come! I took those old Ultra linear towers, and made some sawdust with them.

    Towers with sides (front and rear face) cut off and driver holes and 1 port hole on one cab finished...



    Please pay no attention to the clutter that currently inhabits my garage... :o

    Remnants of front and rear baffles...



    Pic looking through the sides the port tube will be shortened from 8" to 5.5", this was just a test fit in the baffle hole...



    Back side of baffle with NS6 dropped in it's new home while checking fit...



    Backside of Vifa for same reasons...



    Front pic of the drivers temporarily resting in their new home...



    In this pic, I loosely placed the original grills against the sides to give you an idea of the overall size when completed...

    HAGD,
    Marc

    Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

    TMWW thread

    Maurbacs DCR Tower

  • #2
    Re: Maurbacs DCR tower

    For those whom are wondering the driver locations are as follows:

    Upper NS6: 6" down from top, on center

    Vifa BC25: 10.5" down from top, 2" offset

    Port on front is 5.5" from bottom on center

    Lower NS6: 15" down from top on center
    HAGD,
    Marc

    Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

    TMWW thread

    Maurbacs DCR Tower

    Comment


    • #3
      Re: Maurbacs DCR tower

      Okay...

      Now for the fun stuff. After carefully calculating an even seperation of the chamber volumes of 2/3 upper, and 1/3 lower, I have come to the conclusion that the seperation partition needs to be 23" down from the top. This gives me an upper volume of 30.58L (after deducting driver and bracing volumes), and a lower volume of 15.29L. I was originally going to mount both ports on the front baffle, however, there just ain't enough room. So, here is my dilemma; I can place the port on the rear (really my only option I can think of) mounted at tweeter level, but on center.

      It would look like this, but on center, the black line would be the length after cutting it down...




      What I would like to know is if anyone sees an issue doing this with the port for the upper chamber. Final port length would put the end 7 5/8" from the front baffle.
      Last edited by WernerM; 05-29-2013, 10:46 PM.
      HAGD,
      Marc

      Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

      TMWW thread

      Maurbacs DCR Tower

      Comment


      • #4
        Re: Maurbacs DCR tower

        Wowzer - you made some sawdust!
        Looking pretty good. Make sure you get some significant side to side and front to back bracing
        before you button it up. Ain't it nice to have a router? How'd you do the circles?
        Did you (like me) find that the Vifa tweeter was just a tiny bit bigger than 2.75 inches?

        I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
        "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

        High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
        SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
        My Voxel min sub Yet-another-Voxel-build

        Tangband W6-sub

        Comment


        • #5
          Re: Maurbacs DCR tower

          I was going to say something along the lines of "You build boxes funny" but then I read that you had cannibalized the monkey coffins and had a "I see what you did there" moment, but I like it.


          रेतुर्न तो थे स्रोत
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          leviathan system thread
          deadhorse thread
          shockwave build thread

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          in war, victory . . . in peace, vigilance . . . in death, sacrifice.

          Comment


          • #6
            Re: Maurbacs DCR tower

            Oh I forgot to mention, when I am done the external dimensions will be 34" H x 8.5" W x 11" D. I will put them on ~6" riser stand so that the tweeter is at ear height while listening in a seated position. I am thinking of making a small rectangular box for the riser, that will attach to a larger base. I was thinking of putting the crossover in this riser area for easy access to for any tweaking later on.
            HAGD,
            Marc

            Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

            TMWW thread

            Maurbacs DCR Tower

            Comment


            • #7
              Re: Maurbacs DCR tower

              Originally posted by WernerM View Post
              Okay...

              No for the fun stuff. After carefully calculating an even seperation of the chamber volumes of 2/3 upper, and 1/3 lower, I have come to the conclusion that the seperation partition needs to be 23" down from the top. This gives me an upper volume of 30.58L (after deducting driver and bracing volumes), and a lower volume of 15.29L. I was originally goin to mount both ports on the front baffle, however, there just ain't enough room. So, here is my dilemma; I can place the port on the rear (really my only option I can think of) mounted at tweeter level, but on center.

              It would look like this, but on center, the black line would be the length after cutting it down...




              What I would like to know is if anyone sees an issue doing this with the port for the upper chamber. Final port length would put the end 7 5/8" from the front baffle.
              I don't see a problem with the upper port like that. Not very many places to put it, once you start trying to figure it out.

              I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
              "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

              High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
              SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
              My Voxel min sub Yet-another-Voxel-build

              Tangband W6-sub

              Comment


              • #8
                Re: Maurbacs DCR tower

                Well actually I used the 2.75" setting, and it is a snug fit. I also cheated and made a new 1/8" hole in the Jasper jig for the Vifa cutout (didn't have a hole saw for it). I am going to use a half shelf brace in the upper section, and a full brace/chamber seperator. I am going to 1/4" dado in the area for the braces, and the edges (think rabbet style) in the side pieces for added stability as well. so 1/4" of the side panels will sit within the enclosure. I cut the enclosure down to 7.5" wide to compensate for this, that way the overall width will end up being 8.5" using the .75" MDF with .25" of dado/rabbet edges.
                Last edited by WernerM; 05-29-2013, 10:48 PM.
                HAGD,
                Marc

                Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

                TMWW thread

                Maurbacs DCR Tower

                Comment


                • #9
                  Re: Maurbacs DCR tower

                  For finishing, I was thinking of sanding the original box with the laminate wood ( it looks worse in person than it does in the pictures), and painting it. I think I may use black DuraTex on the sides, and maybe a rustoleum hammered copper paint on the original front, top, and rear. Basically everything that is wood laminate covered right now will be hammered copper, and everything that is new, look at the grills and think of them in black DuraTex...
                  HAGD,
                  Marc

                  Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

                  TMWW thread

                  Maurbacs DCR Tower

                  Comment


                  • #10
                    Re: Maurbacs DCR tower

                    Sounds like a plan. You seem to overcome woodworking "challenges" better than I do.
                    Plenty of smokes burned with me standing there thinking "well, just how do I fix that goof up"

                    I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                    "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                    High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                    SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                    My Voxel min sub Yet-another-Voxel-build

                    Tangband W6-sub

                    Comment


                    • #11
                      Re: Maurbacs DCR tower

                      LMAO! Well I actually test cut (and test fit) the holes in a scrap piece first to make sure I was using the right settings. :D
                      Last edited by WernerM; 05-29-2013, 10:49 PM.
                      HAGD,
                      Marc

                      Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

                      TMWW thread

                      Maurbacs DCR Tower

                      Comment


                      • #12
                        Re: Maurbacs DCR tower

                        Typically the 'exit' ports go on the same surface. You should have room below the lower woofer i you use a 2/3 - 1/3 arrangement in one way or another.

                        How about using an elbow and placing it in the lower chamber through tothe other?
                        OR- you could use 2 equivalent ports to flank in the spots below the lower woofer.

                        OR- mount the lower port on the back as well, and cover the front hole with something decorative.
                        Just some thoughts...
                        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*

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                        http://techtalk.parts-express.com/blog.php?u=4102

                        Comment


                        • #13
                          Re: Maurbacs DCR tower

                          Let me ask this... IIRC the GROT is to keep one port distance away from boundaries. Is that one port distance away from the center of the port, or the edge of the port? IOW the reason I said I can't put the other one on the front, is because the edge of the port (side) will be within 2.25" from the seperation brace. As I understand it, if the port is too close to a boundry, then you effectively lengthen the port, and lower the overall tuning of the chamber. I have always assumed that this rule was from the edge of the port, not the center...
                          HAGD,
                          Marc

                          Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

                          TMWW thread

                          Maurbacs DCR Tower

                          Comment


                          • #14
                            Re: Maurbacs DCR tower

                            Originally posted by Wolf View Post
                            Typically the 'exit' ports go on the same surface. You should have room below the lower woofer i you use a 2/3 - 1/3 arrangement in one way or another.

                            How about using an elbow and placing it in the lower chamber through tothe other?
                            OR- you could use 2 equivalent ports to flank in the spots below the lower woofer.

                            OR- mount the lower port on the back as well, and cover the front hole with something decorative.
                            Just some thoughts...
                            Wolf
                            Please enlighten me. Is this for aesthetics, or is there a scientific reason for this? If I go below the woofer, that leaves me with 1.5" from the interior lower wall of the port to the seperation brace. do you think this distance is sufficient enough not to cause any real ill effects? In all honesty I would prefer it on the front as well. Reminder, port is 2.25" I.D.
                            HAGD,
                            Marc

                            Even though I try to tell everyone upfront, understand that I am still a Newb. I wish the status of Seasoned Veteran/Senior Member, etc. was earned with time not posts...

                            TMWW thread

                            Maurbacs DCR Tower

                            Comment


                            • #15
                              Re: Maurbacs DCR tower

                              Very cool idea! Man, I look at that and think "what an easy way to knock out a MLTL!" Plus, the novelty/cool-factor of reclaimed materials is bitchin!

                              Props do you dude!

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