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Sunflower HT/Music LCR Build

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  • Sunflower HT/Music LCR Build

    Finally some Sunflower love, the build has started, all designs from (and a big thank you to) Paul C.

    Sunflower Redux LR (https://sites.google.com/site/undefi...diy-sunflowers):
    Basically the stock "open source" design, with the MTM section raised 1" so the tweeter matches my seated ear height. Driven by classdaudio DIY amp kit, run full range.

    Sunflower CC (background info at http://techtalk.parts-express.com/sh...d.php?t=229759 and http://techtalk.parts-express.com/sh...d.php?t=229425):
    Run directly off receiver, cutoff at 80~100 Hz to subs.

    "Skinny" Turtle subs (modified, http://techtalk.parts-express.com/sh...d.php?t=221133):
    My own unendorsed mod, front baffle shares the same width as the mains, the rest resized to maintain volume and fit into my entertainment stand.

    General build/setup notes:
    Build material all around is 18mm Russian Birch Ply. I was originally going to go with MDF for cost savings, but after finding the birch at a local source for only $0.70/sqft cost difference the decision was easy (let's see, MDF and the additional paint/veneer vs birch ply cut/coat/done :rolleyes. This is my first experience with quality birch ply, and so far I find it SO much nicer to work with than MDF. I matched as many of the mains/sub dimensions as possible to minimize cut width counts.

    There will be two subs. One directly under the center channel, the other directly behind and centered on the listening position, each driven through miniDSP and an old 100wrms Marantz amp. When the left/right channels are run full range, my HT receiver allows feeding 25% of their bass below 60Hz to the sub out. I am banking the two RS-225's and the two RSS210's (using the miniDSP highpass filters) can handle any movie bass thrown at them in my small condo HT (my average listening level is fairly low definitely NOT cranked), and four transducers always in concurrent operation for both HT & music bass duties will nail most modal issues.

    I intend to update the thread as I go along, please fire away with comments questions concerns !!!
    Attached Files
    Last edited by rvsixer; 06-24-2012, 08:22 AM.

  • #2
    Re: Sunflower HT/Music LCR Build

    Looks great! Is there going to be a matching MT Surround speaker?

    Comment


    • #3
      Re: Sunflower HT/Music LCR Build

      Originally posted by lostboy77 View Post
      Looks great! Is there going to be a matching MT Surround speaker?
      Thanks! I don't listen to any surround music (yet), so I am just going with my old Mirage FX surrounds for now. If they don't match well enough there's a RJB Microbe MT & MTM variation out there using the same tweet/mid as the Sunflowers.

      Comment


      • #4
        Re: Sunflower HT/Music LCR Build

        Glad to see you're getting started. Looking good so far! Looking forward to seeing the finished product, and your listening impressions of that CC.
        RYAN N.

        "Why do you have the stereo on while you're watching TV?" - "....Cause I like to party."

        RSS390HF Build - http://techtalk.parts-express.com/sh...d.php?t=224998
        AviaTrix Build - http://techtalk.parts-express.com/sh...d.php?t=230372
        Wolf's PC Speakers Build - http://techtalk.parts-express.com/sh...84#post1838384
        Overnight Sensations MT Build - http://techtalk.parts-express.com/sh...ation-MT-build

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        • #5
          Re: Sunflower HT/Music LCR Build

          TOOL FIND:

          So I started looking for a drill press, knowing I wanted straight holes throughout the Sunflowers (and I was going to try to design/fabricate a circle jig for my router). Well, the presses with a 6" throat depth (to handle the 11" wide baffles) were big on dollars, and big on space (space is at a premium in my 2-car garage, which has a mid-size car and a full-size truck in it as well).

          An internet search led me to Big Gator Tools. They make a line of drill and tap jigs (including heli-coil insert models), that you can take to your work and be assured straight accurate holes and threads (pics attached). Best price was from their ebay store (because of the cheap shipping charges in comparison to other vendors).

          Now that I have used these tools I am wondering where have these been all my life ??? Parts Express might want to seriously consider carrying these, I can see them being useful for any audio build project. They are v-shaped on the bottom so use on round stock is also fine. Now if they could only work for perpendicular holes in a sphere, that would help on an upcoming spherical-mount telescope build......
          Attached Files
          Last edited by rvsixer; 07-01-2012, 11:49 AM.

          Comment


          • #6
            Re: Sunflower HT/Music LCR Build

            ROUTER CIRCLE JIG:

            My Triton router came with a multipurpose jig, which included a rather "cheapish" circle attachment (basically a piece of plastic with a couple of holes, which you stick a nail through as the pivot point). Worked will enough for my previous large woofer'ed OB builds, but the 5 1/2" minimum diameter would not do for the XT tweeters and RS125's.

            Jasper Jig does not fit the Triton, the Router Buddy does, but I was convinced I could make a jig and save some $$$. I had some scrap 1" x 1/8" aluminum bar, so off to the local True Value store with their wonderful hardware section consisting of quite odd odd's-n'ends. I came up with the pictured jig (infinitely adjustable within its range), which should allow holes of less than 1" diameter with a 1/4" bit.

            The plan is to try it out tomorrow, we will see how it goes...
            Attached Files
            Last edited by rvsixer; 06-29-2012, 12:29 PM.

            Comment


            • #7
              Re: Sunflower HT/Music LCR Build

              Originally posted by DIYNut42 View Post
              Glad to see you're getting started. Looking good so far! Looking forward to seeing the finished product, and your listening impressions of that CC.
              Thanks. Will keep updating, I am betting the center will sound great.

              Got any more RS125's, or any not-priced-higher-than-new XT25's LOL :p:o....

              Comment


              • #8
                Re: Sunflower HT/Music LCR Build

                HOLE CUTTING:

                A full day in the garage today. The diy circle guide worked great!
                All 24 holes cut with recesses, all midrange and woofer rear exits beveled.

                Next up driver mount holes, then gluing up
                Attached Files

                Comment


                • #9
                  Re: Sunflower HT/Music LCR Build

                  Originally posted by rvsixer View Post
                  ROUTER CIRCLE JIG:

                  My Triton router came with a multipurpose jig, which included a rather "cheapish" circle attachment (basically a piece of plastic with a couple of holes, which you stick a nail through as the pivot point). Worked will enough for my previous large woofer'ed OB builds, but the 5 1/2" minimum diameter would not do for the XT tweeters and RS125's.

                  Jasper Jig does not fit the Triton, the Router Buddy does, but I was convinced I could make a jig and save some $$$. I had some scrap 1" x 1/8" aluminum bar, so off to the local True Value store with their wonderful hardware section consisting of quite odd odd's-n'ends. I came up with the pictured jig (infinitely adjustable within its range), which should allow holes of less than 1" diameter with a 1/4" bit.

                  The plan is to try it out tomorrow, we will see how it goes...
                  Took me a min, but I see what you did there, the piece closest to the bit rides in a hole, and then the router swivels around it correct? Nice job figuring that trick out. Very useful idea.
                  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: Sunflower HT/Music LCR Build

                    Originally posted by WernerM View Post
                    ...the piece closest to the bit rides in a hole, and then the router swivels around it correct?
                    Correct. I can't really take credit for the idea, its basically how all the circle jigs out there work (though to make it work with the existing Triton jig, I did have to reverse the pivot point in relation to the set point).

                    I was actually amazed how accurate the cuts could be made (I have machining background from eons ago, but am new to wood working of any detail). Measure diameter of cutting bit, measure diameter of pivot pin and divide by two, subtract this sum from required radius, set and lock calipers to this value to adjust jig, and then cut. Easy and repeatable cuts within a few thousandths.

                    Comment


                    • #11
                      Re: Sunflower HT/Music LCR Build

                      It is looking very nice thus far, I am interested in building these as my next project for reference speakers. I like the open baffle design, and feel that they should provide excellent imaging.
                      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: Sunflower HT/Music LCR Build

                        Originally posted by WernerM View Post
                        It is looking very nice thus far, I am interested in building these as my next project for reference speakers. I like the open baffle design, and feel that they should provide excellent imaging.
                        correction the dipole design...
                        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


                        • #13
                          Re: Sunflower HT/Music LCR Build

                          Originally posted by WernerM View Post
                          correction the dipole design...
                          Actually I think you are correct on both counts . Unless I have it wrong, the mids are open baffle and are in dipole operation. The tweets and bass are monopole.

                          On a project update note, all the driver holes/retainers are in place. Getting ready for glue on the 4th!

                          Comment


                          • #14
                            Re: Sunflower HT/Music LCR Build

                            GLUING BEGINS:

                            I got as far as gluing the subs and center together today. I decided to use Titebond III after researching many posts here on the forum, which turned out to be an excellent choice. I never ran out of setup time, and the short clamp time of only 30 minutes allowed for making real progress (even with the minimal amount of clamps I have).

                            The center channel was designed to fit my current TV & stand, and to my surprise it fit quite well. As you can see from the pics, the inside of the CC got a little tight in there with the size restraints.

                            On to the mains this weekend...
                            Attached Files

                            Comment


                            • #15
                              Re: Sunflower HT/Music LCR Build

                              Gluing continues, SCARY ARSE NEWBIE ROUNDOVERS COMMENCE:

                              Glue up finished, first time newbie roundovers completed successfully. Several neighbors come by to check it out at this point, so the project must be starting to look like speakers .
                              Attached Files

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