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Carmody Tarkus 3-Way in a one-piece curved cabinet

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  • Carmody Tarkus 3-Way in a one-piece curved cabinet

    Hi All,
    I'm picking up from where I left off over on the Tech Questions forum, where I got some help with mocking up a one-piece Tarkus cabinet in Sketchup. (http://techtalk.parts-express.com/sh...d.php?t=224284) I got a little time this weekend to start cutting wood, and got all the pieces cut and routed except the curved sides.

    Anyway, here are the pictures for anyone who's interested. I'm getting excited about having a big slamming speaker to listen to - like college back in the early 90s!

    Here's the design I'm going for, next to the stock Tarkus cabinet. Volume and driver spacing are the same:




    Cutting out the hardboard template, to be used to cut the first curved baffle:



    The first baffle taking shape. After this, I used a pattern bit riding against the first baffle to make three more copies:



    Making sure it looks something like the model :D:



    All the pieces more-or-less fit together:



    I always feel relief when the drivers fit without having to get out the file and sandpaper:



    For bracing, I went with 7/8" dowels. They are tightly press-fitted and glued into the baffles running front-to back, and there will be some cross-bracing provided by the sealed section and a dowl or two.
    Here are some of the dowels pressed in with no glue. This was sort of an experiment, but it looks like it may work fine. I'm planning to veneer over the cabinets so the ends won't be visible:



    Size comparison with a Statement Monitor. The Tarkus won't be too huge for having a 10" woofer. My wife's not having a fit, anyway.




    That's it for now. I can't wait to hear them. Thanks Paul for your cool design. I'm definitely open to any suggestions or advice....

    --Colin
    Last edited by cowtown; 07-27-2012, 05:03 PM.

  • #2
    Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

    Argh! I misspelled Carmody in the thread title. Sorry. I can't seem to edit it.

    Comment


    • #3
      Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

      veeerrrry nice so far. paul is so famous.
      " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

      Quote Originally Posted by hongrn. Oct 2014
      Do you realize that being an American is like winning the biggest jackpot ever??

      http://www.midwestaudioclub.com/spot...owell-simpson/
      http://s413.photobucket.com/albums/pp216/arlis/

      Comment


      • #4
        Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

        Looking forward to seeing your build progress the design looks very nice best of luck.

        Take it easy
        Jay
        "I like Brewski's threads, they always end up being hybrid beer/speaker threads based on the name of his newest creation." - Greywarden

        Breakfast Stout - HiVi RT2 II/Aurasound NS6
        Imperial Russian Stout - Vifa DX25/Fountek FW146/(2) Fountek FW168s - Built by Fastbike
        Ruination 2.5 way - Vifa DX25/Fountek FW168
        Levitation TM
        - Vifa BC25SG15/Fountek FW168

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        • #5
          Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

          Originally posted by cowtown View Post
          Argh! I misspelled Carmody in the thread title. Sorry. I can't seem to edit it.
          oh no. That is unfortunate. If you read the fine print at Undefinition, you must cease all work on Carmody designs, as well as forfeiting all equipment used in said construction, and also agreeing to the purchase at 3 times market value, and daily listening of Bose products only for the remainder of said lifetime.


          it looked like a good take on a great design... oh well.



          ....kidding aside. looking good.
          My projects
          https://picasaweb.google.com/112307725038877176664

          Comment


          • #6
            Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

            Nice work man! I had fun building mine, but you're taking it to the next level! I can't wait to see the finished build. I like the dowel braces, cool idea drilling all the way through. It should provide a lot more glue area than just fitting them between the panels. How do you plan to tackle the crossovers?
            My modest builds:
            Armadillo TM, A.K.A. Lil' Dillo
            Tarkus/Armadillo build #2
            Armadillo Center Channel
            Au-Rock-O Sub
            Tarkus
            Staining MDF tutorial

            Comment


            • #7
              Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

              That is simply awesome work.

              Comment


              • #8
                Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

                Colin, very nice looking build so far my man. A few observations, I think the Dowel system should work great. Constructed properly I think it will provide pleanty of strength and I was wondering what kinda of circle cutting jig you used? The holes look very clean. Thanks R.K.

                Comment


                • #9
                  Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

                  Originally posted by cowtown View Post
                  Argh! I misspelled Carmody in the thread title. Sorry. I can't seem to edit it.
                  Fixed.
                  Your results may vary.

                  Comment


                  • #10
                    Re: Carmody Tarkus 3-Way in a one-piece curved cabinet

                    Originally posted by bolland83 View Post
                    Nice work man! I had fun building mine, but you're taking it to the next level! I can't wait to see the finished build. I like the dowel braces, cool idea drilling all the way through. It should provide a lot more glue area than just fitting them between the panels. How do you plan to tackle the crossovers?
                    I'm thinking about building the crossovers on protoboard, but might just use more hardboard. I'll probably do them in two pieces...also thinking about mounting two sets of binding posts on each speaker (one pair for the woofer and one for the mid/high) even though it's one cabinet to allow for going active later on if needed.

                    Bolland your speakers are just stunning - I can't get over that finish you did on MDF. I don't think I could pull that off, and will stick with safe veneer.

                    Originally posted by Randall Kepley View Post
                    Colin, very nice looking build so far my man. A few observations, I think the Dowel system should work great. Constructed properly I think it will provide pleanty of strength and I was wondering what kinda of circle cutting jig you used? The holes look very clean. Thanks R.K.
                    Hey Randall, I cut the driver and port holes with a gool ol Jasper jig. I have a decent Bosch router and used a 1/4" spiral upcut bit, doing 1/8" passes at the highest speed. I stuck the two baffles together with double-sided tape and drilled the pilot holes through both at the same time with a mill/drill press, to minimize differences between the baffles. Then routed one baffle, flipped them over, and routed the other.

                    The 7/8" holes for the dowels are all done on the mill/drill, using a hole cutting bit. For this, I stacked up the front baffle and its matching back and went through in one shot. This was the only way I could think of to make sure the dowels will be perfectly straight and true.



                    Last edited by cowtown; 07-27-2012, 05:05 PM.

                    Comment


                    • #11
                      Re: Carmody Tarkus 3-Way in a one-piece curved cabinet

                      That is some seriously nice woodwork!

                      Comment


                      • #12
                        Re: Carmoody Tarkus 3-Way in a one-piece curved cabinet

                        Randall, I'd worry that the dowel ends will telegraph through the veneer if not covered/blended. Do you have any experience with issues like that?


                        Originally posted by Randall Kepley View Post
                        Colin, very nice looking build so far my man. A few observations, I think the Dowel system should work great. Constructed properly I think it will provide pleanty of strength and I was wondering what kinda of circle cutting jig you used? The holes look very clean. Thanks R.K.
                        I was so much older then, I'm younger than that now.
                        OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
                        Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
                        Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
                        Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
                        LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

                        Comment


                        • #13
                          Re: Carmody Tarkus 3-Way in a one-piece curved cabinet

                          A good idea if you ever think you might try active. Certainly the time do it is now. I'm really liking the way the build is going together (except a bit of concern about the dowel end, don't have any personal experience veneering over something like that).


                          Originally posted by cowtown View Post
                          also thinking about mounting two sets of binding posts on each speaker (one pair for the woofer and one for the mid/high) even though it's one cabinet to allow for going active later on if needed.
                          I was so much older then, I'm younger than that now.
                          OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
                          Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
                          Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
                          Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
                          LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

                          Comment


                          • #14
                            Re: Carmody Tarkus 3-Way in a one-piece curved cabinet

                            It depends on what kind of dowl is used, humidity, temp.... All wood absorbs most of its moisture through the end grain, If using say a oak dowl it will absorb moisture alot faster than say Maple or Cherry. Oak is a very porous wood , end grain and face grain. Where Maple or Cherry is a very tight grain , face and end. The optomial way to do this would have been to drill the dowl holes w/ a forstner bit where the dowls are located from the inside out and stoping within about 1/8th" from the outside, glueing in place and never exposing the end grain. But I would think if Colin would use something like Poly and thin it w/ lacquer thinner and flood the end grain a few days before veneering it will be fine as long as the dowls are realy glued in place securely. R.K.

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                            • #15
                              Re: Carmody Tarkus 3-Way in a one-piece curved cabinet

                              You could always laminate an 1/8" of hardboard over the face of the cab to cover the ends of the dowels. A "pre-veneer" layer if you will. Or if the dowels look nice enough, leave the dowels exposed as part of the finish, I suppose that could look nice if you were doing a birch ply cab with a natural finish.
                              My modest builds:
                              Armadillo TM, A.K.A. Lil' Dillo
                              Tarkus/Armadillo build #2
                              Armadillo Center Channel
                              Au-Rock-O Sub
                              Tarkus
                              Staining MDF tutorial

                              Comment

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