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The Super Bees - Garage two way build

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  • #91
    3rd time is the charm Sent from my Pixel 2 XL using Tapatalk
    Voxel Down Firing with Dayton SA70
    Translam Subwoofers - The Jedi Mind Tricks
    The Super Bees - Garage 2 way
    SevenSixTwo - InDIYana 2018 Coax

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    • #92
      Looking good. I had to do a very similar notch in my breezy monitors (new version of the dynavox 6.5 poly in a br1 cab) to tame an odd hump that showed up when trying to cross high enough to keep the xt25 happy. It looked to me from the drivers factory response that it would be a super simple woofer circuit but once in cab it got a little funny. To avoid the notch and not have the hump I would have had to cross too low for the xt25.
      Projects:

      Breezy Monitors: http://techtalk.parts-express.com/fo...reezy-monitors
      transcenD: http://techtalk.parts-express.com/fo...5035-transcend
      Summits: http://techtalk.parts-express.com/sh...75-The-Summits
      References: http://techtalk.parts-express.com/sh...-My-References
      Vintage Style 2-way: http://techtalk.parts-express.com/sh...-vintage-2-way

      Comment


      • #93
        Originally posted by dynamo View Post
        Looking good. I had to do a very similar notch in my breezy monitors (new version of the dynavox 6.5 poly in a br1 cab) to tame an odd hump that showed up when trying to cross high enough to keep the xt25 happy. It looked to me from the drivers factory response that it would be a super simple woofer circuit but once in cab it got a little funny. To avoid the notch and not have the hump I would have had to cross too low for the xt25.
        Thanks Dynamo! I was hoping to make this XO as simple as possible and avoid any notch filters if possible. The external XO boards were easy to put together, but I suspect compacting all these parts into a smaller 5" x 7" (or maybe even a 3" x 5" board ) will be a challenge!

        If I have time between today and tomorrow, I might try swapping out one of those 2x15uF parallel NPE caps for a different pair to see if that is what is causing my FR difference around 2K. When I decided the XO was done, I was listening to it as the blue line version (lower 2K and no funny spike at ~14K). OmniMic says this is a 1 dB difference at the 2K range. I suspect that would be audible (and thus undesirable!).

        I wonder how common it is to customize the XO design for each cabinet in a pair of speakers? My thought process currently stops at "make a custom XO" rather than tailoring it to each set of drivers.
        Voxel Down Firing with Dayton SA70
        Translam Subwoofers - The Jedi Mind Tricks
        The Super Bees - Garage 2 way
        SevenSixTwo - InDIYana 2018 Coax

        Comment


        • #94
          Seems plausible that the esr of the npe could affect the knee of the roll off enough to make that 1db difference. I would venture to guess that in high end matched pair designs, at least commercially, they likely keep all components and drivers used in a tight tolerance range to the original design vs tweaking each speakers crossover to match a specified response. No idea though, just speculation.
          Projects:

          Breezy Monitors: http://techtalk.parts-express.com/fo...reezy-monitors
          transcenD: http://techtalk.parts-express.com/fo...5035-transcend
          Summits: http://techtalk.parts-express.com/sh...75-The-Summits
          References: http://techtalk.parts-express.com/sh...-My-References
          Vintage Style 2-way: http://techtalk.parts-express.com/sh...-vintage-2-way

          Comment


          • #95
            That 6 db rise in response from 300 to 600 hz looks like classic baffle step.* When you put these against the wall in your garage, that should flatten out and it looks like your Super Bees will be one of the flattest response "garage speakers" around.* Good job. *

            I'm not sure the 1 db difference between the two is anything more than driver variances.* I don't know that I would change anything to compensate.* But to see if it is a XO component, swap the XOs between the speakers and if the difference moves to the other speaker then it is indeed a component and not a driver variation.

            -Bob
            -Bob

            The PEDS 2.1 mini system
            My A7 Project - another small desktop speaker
            The B3 Hybrid Dipole - thread incomplete and outdated

            Comment


            • #96
              Originally posted by BOBinGA View Post
              That 6 db rise in response from 300 to 600 hz looks like classic baffle step.* When you put these against the wall in your garage, that should flatten out and it looks like your Super Bees will be one of the flattest response "garage speakers" around.* Good job. *

              I'm not sure the 1 db difference between the two is anything more than driver variances.* I don't know that I would change anything to compensate.* But to see if it is a XO component, swap the XOs between the speakers and if the difference moves to the other speaker then it is indeed a component and not a driver variation.

              -Bob
              Hi Bob, Thanks for your comments That 300-600 Hz area has been one of the areas that I was a bit confused about during the early stages of this XO design (circa post #41). My first attempts tried to model a nominally flat response by attenuating everything above 300/400 Hz down to match, but this caused a sizeable inductor bump isssue below 300 Hz as well. I thought the XO electric phase and impedance response could have been better too, so I came up with the version I have now. I figured I would spend less effort fighting that 300-600 Hz area and aim for good response above there. My ability to accurately measure this region for XO work is also suspect. The most recent OmniMic FR plots show a lot of room interactions since I was measuring at 30" on-axis with the tweeter. I wasn't interested in doing blended nearfield / farfield for each cabinet. That's a lot of microphone movement! At the very least I thought it sounded good, so whether or not the OmniMic showed it being well behaved from a technical standpoint is almost secondary. We'll see how it sounds outside of my basement soon enough!

              I like your ideas regarding swapping the XO to determine if the issue is driver based vs. XO based. That's an easy thing to do! Thanks for suggesting it!
              Voxel Down Firing with Dayton SA70
              Translam Subwoofers - The Jedi Mind Tricks
              The Super Bees - Garage 2 way
              SevenSixTwo - InDIYana 2018 Coax

              Comment

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