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It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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First Time Builder - Sunflower Redux Project

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  • First Time Builder - Sunflower Redux Project

    Hope I haven't bit off more than I can chew. Any help is appreciated. I travel a lot so this project could take a few months to complete. Basic cabinet plan is completed, Interior dimensions give me 42.9 liters. Crossover layout is done and I did a quick mock-up this afternoon. Seems like it is time to get the saw blade and router spinning. Here are a couple of quick pics. Please excuse the hand drawing - best I could do on the plane ride.
    Crossover Mock up on cardboard Quick hand drawing of cabinet plan

  • #2
    nice work -- looking forward to seeing the completed project

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    • #3
      Looks great. I don't know how far apart your coils are, but you may want to follow some of the layout practices from here (i.e. avoid parallel placement of inductors without sufficient separation, etc.):
      http://www.troelsgravesen.dk/coils.htm

      Possible inspiration from my Redux build, still enjoying them to this day:
      http://techtalk.parts-express.com/fo...usic-lcr-build

      Comment


      • #4
        Originally posted by rvsixer View Post
        Looks great. I don't know how far apart your coils are, but you may want to follow some of the layout practices from here (i.e. avoid parallel placement of inductors without sufficient separation, etc.):
        http://www.troelsgravesen.dk/coils.htm

        Possible inspiration from my Redux build, still enjoying them to this day:
        http://<a href="http://techtalk.part...-lcr-build</a>
        Thanks for this. Looking again, do you think moving the top iron core inductor to the top right corner, then re-positioning the center air core inductors a bit might help? The components are on an 8.5" x 9.5" rectangle.

        I did read over your build thread (along with a few others) as I was contemplating this build. Beautiful work, and definitely inspiration!
        Last edited by ScottyP; 03-24-2019, 06:57 AM.

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        • #5
          It wouldn't hurt, but (due to the largeness of your board) I think you're OK.
          There's nothing really BAD going on there.

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          • #6
            If anything, I would just turn that center air core inductor 90 degrees so that its' core is oriented north-south instead of east-west like the two iron laminate core inductors are facing.
            Craig

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            • #7
              Originally posted by PWR RYD View Post
              If anything, I would just turn that center air core inductor 90 degrees so that its' core is oriented north-south instead of east-west like the two iron laminate core inductors are facing.
              I am working on a revision. Thinking of laying the center oriented up-down, moving the top iron core to the right top corner, Turning lower left and upper right oriented Northwest-Southeast and lower right air core inductor oriented Northeast-Southwest. I'll attach a sketch as soon as I have WiFi that is quick enough. Hotel connectivity is spotty here.

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              • #8

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                • #9
                  Yup,
                  but it also wouldn't hurt to turn the 3 angled ones CW or CCW 45* each (if that looked "better" - all the SAME rotation direction).

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                  • #10
                    here is the revised layout. Any "gotchas"?

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                    • #11
                      Originally posted by Chris Roemer View Post
                      Yup,
                      but it also wouldn't hurt to turn the 3 angled ones CW or CCW 45* each (if that looked "better" - all the SAME rotation direction).
                      Thanks, Chris. It seems that if you look through the coil as if it were a gun site, you should not see another inductor (unless I am interpreting the best practices in http://www.troelsgravesen.dk/coils.htm incorrectly. The only way I see to avoid this is positioning these at the angle. The 2 that are parallel are more than 20cm apart, so those should be ok. all others are "aimed" 90 degrees away from adjacent inductors. Am I missing anything?

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                      • #12
                        Considering building these as powered speakers using ICEpower boards. Any of you have experience using these?

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                        • #13
                          Well the design looks too interesting...Actually i m waiting for the project to be completed and see it working..Pls post video here when it gets completed..All the very best for your project www.myschoolbucks.com
                          Last edited by Debra27; 05-01-2019, 12:32 AM.

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                          • #14
                            Originally posted by ScottyP View Post
                            Considering building these as powered speakers using ICEpower boards. Any of you have experience using these?
                            For what it's worth, I have a pair of Sunflower Reduxes as my go-to, main, satisfied-my-major-speaker-building-hunger. I use a HiFiMeDIY T3S to power them. They really R.O.C.K! This amp pushes the Sunflowers without breaking a sweat. I would imagine ICE amps would do the same.

                            I still love building speakers and continue to do so, but the Sunflowers are so satisfying, I don't have the desire to look for another pair of main listeners.

                            Mike
                            "We're speaker geeks, not speaker nerds. Nerds make money!" Marty H
                            Bismarck, North Dakota
                            My Current System: Jolida SJ502A, Squeezebox Touch, and Carmody Sunflowers
                            My Garage System:Marantz 2238B and Nano-Neos

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