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The Silverbacks - 2015 Iron Driver Winner

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  • The Silverbacks - 2015 Iron Driver Winner

    Click image for larger version

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ID:	1192269Drop Box link: https://www.dropbox.com/sh/gyobv92es...iFREKcR7a?dl=0
    http://www.mcmelectronics.com/produc...-2421-/55-2421https://www.madisoundspeakerstore.co...m-cone-woofer/Click image for larger version

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    As for the crossover, I ended up settling on roughly second order Butterworth at 240 Hz for the woofer LP, 400 Hz second order Bessel on the mid HP, 2200 Hz third order Butterworth on the mid LP, and sixth order Butterworth at 2800 Hz on the tweeter HP . I started out close to this and then played with the voicing a bit until I got something I was pretty happy with. I tried crossing the tweeter lower at around 2 kHz, but it sounded a little grainy. It also increased the parts count, and might have pushed me out of the budget.

    Sims:
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    Un-spliced measurement (after revision) taken at 30" with 1/48th octave smoothing:
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    Impedance:
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    Last edited by Navy Guy; 06-23-2015, 09:09 AM.
    -Kerry

    www.pursuitofperfectsound.com

  • #2
    Re: The Silverbacks - 2015 Iron Driver Winner

    Polars (revised version):
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    The slightly recessed area below 1 kHz is due to the response on the mid. The initial simulations showed more contribution in this area from the woofer response, which filled in some of the area that is still showing some affects of baffle losses on the mid. Measured results show this area didn't fill in as much as the sims. This could have been adjusted for in the crossover, but due to the cost restrictions of the Iron Driver competition, the components required would have put it over the price limit on parts and fixing it now would take a complete redesign of the crossover, which I don't really want to get into.

    Updated crossover schematic after re-voicing post Iron Driver:
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    Here is some more info on the box tuning. This is with the 1.1 Ohm of resistance factored in and an input power of 120 watts :eek: Also just noticed that the graphs say HiVi D6.8, which is not correct. This is for the MCM 8" subwoofer

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    Last edited by Navy Guy; 06-22-2015, 07:16 PM.
    -Kerry

    www.pursuitofperfectsound.com

    Comment


    • #3
      Re: The Silverbacks - 2015 Iron Driver Winner

      0-90 degree measurements out in the middle of the room. This was with OmniMic blend function with a 4.8ms gate time at 1/48th octave. My room always shows quite a bit of energy in the 100-200 Hz region, even in this position, but it never sounds like that much. I've noticed most speakers look about 5db too high there than they sound or measure when using spliced, nearfield measurements.

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      I didn't take distortion on the tweeters since Jeff Bagby did a set of measurements on them a while back.

      MCM 8" woofer at 4" mic distance:
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      SB12PAC25 at 4" mic distance:
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      Last edited by Navy Guy; 06-22-2015, 07:28 PM.
      -Kerry

      www.pursuitofperfectsound.com

      Comment


      • #4
        Re: The Silverbacks - 2015 Iron Driver Winner

        Beautiful speaker.
        Kenny

        http://www.diy-ny.com/
        DIY NY/NJ 2014 https://www.youtube.com/watch?v=FGwA...ature=youtu.be
        Man does not live by measurements alone, a little music helps.

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        • #5
          Re: The Silverbacks - 2015 Iron Driver Winner

          I'm getting a 404 error fro the drop box link. Definitely interested in some construction photos.
          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

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          • #6
            Re: The Silverbacks - 2015 Iron Driver Winner

            Originally posted by fastbike1 View Post
            I'm getting a 404 error fro the drop box link. Definitely interested in some construction photos.
            Fixed.
            -Kerry

            www.pursuitofperfectsound.com

            Comment


            • #7
              Re: The Silverbacks - 2015 Iron Driver Winner

              Beautiful :applause:
              Really like this design. Would like to hear some listening impressions of others.
              Could be my next project.

              Comment


              • #8
                Re: The Silverbacks - 2015 Iron Driver Winner

                Like:applause:

                Comment


                • #9
                  Re: The Silverbacks - 2015 Iron Driver Winner

                  Very nice.
                  http://jaysspeakerpage.weebly.com/

                  Comment


                  • #10
                    Re: The Silverbacks - 2015 Iron Driver Winner

                    Looks like a solid design! However- there is no such thing as a 3rd order Bessel. BS and LR are even-order alignments.
                    I've looked at that 4" mid more than once.....
                    Later,
                    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*

                    Photobucket pages:
                    http://photobucket.com/Wolf-Speakers_and_more

                    My blog/writeups/thoughts here at PE:
                    http://techtalk.parts-express.com/blog.php?u=4102

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                    • #11
                      Re: The Silverbacks - 2015 Iron Driver Winner

                      Thanks for sharing Kerry - and congrats on the win again!
                      See my projects on Instagram and Facebook

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                      • #12
                        Re: The Silverbacks - 2015 Iron Driver Winner

                        Originally posted by Wolf View Post
                        Looks like a solid design! However- there is no such thing as a 3rd order Bessel. BS and LR are even-order alignments.
                        I've looked at that 4" mid more than once.....
                        Later,
                        Wolf
                        Typo. That was supposed to be Butterworth. Good catch! I'll update.
                        -Kerry

                        www.pursuitofperfectsound.com

                        Comment


                        • #13
                          Re: The Silverbacks - 2015 Iron Driver Winner

                          Originally posted by Navy Guy View Post
                          [ATTACH=CONFIG]57576[/ATTACH]
                          Nice write-up, and congrats! Out of curiosity, how close were the speakers to walls for this in-room measurement?
                          Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
                          Sites: Jupiter Audioworks - Flicker Stream - FRD Consortium Archive - Proud Member of Midwest Audio Club

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                          • #14
                            Re: The Silverbacks - 2015 Iron Driver Winner

                            Nice form and color scheme. How was that woofer to work with? I tried using it once crossed at about 150-200Hz and couldn't get it to integrate well.

                            Dan
                            _____________________________
                            Tall Boys
                            NRNP Computer Sub
                            The Boxers
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                            UX3

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                            • #15
                              Re: The Silverbacks - 2015 Iron Driver Winner

                              Beautiful design!
                              -Robert

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