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First Crossover design, check me?

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  • #16
    Woops! Labeled the tweeter wrong. It is the SB29RDNC-C000-4....which is still available. The stuff I posted was based on the specs for that tweeter, not the SB29RDAC-C000-4.

    Sorry about the mixup.

    Tolstoy

    The sun is the same in a relative way, but you're older. Shorter of breath and one day closer to death.

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    • #17
      Your crossover simulations look pretty good to me. Nice work!

      For the 1/2" inset of the baffle, I like that look also. I have built many speakers that way and they sound just fine. Style is important.

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      • #18
        Really, if you want someone to check your design prowess, you should supply YOUR F/Z files, otherwise it's apples to oranges.
        (Using mfr. curves) I still see a hump at the tweeter rolloff, and essentially NO baffle-step.
        The low-pass looks pretty good, but I'd be surprised if you couldn't (pretty much) duplicate the xfer fn w/OUT the notch.

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        • #19
          Would a purchase of a miniDSP UMIK-1 and the download of Boxsim get me what I need to be more effective? I don't want to get too deep money wise as I could see this being the only speaker I ever do, but I could also see myself getting way into it and using this test equipment a ton. If I do get into it more, I would for sure invest in some better testing equipment.

          Thanks!

          Tolstoy

          The sun is the same in a relative way, but you're older. Shorter of breath and one day closer to death.

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          • #20
            I'll say this- The SB29 tweeters are capable of xovering lower than 3kHz. I understand if this is what you wanted in terms of design, but a much lesser tweeter could have easily been up to this task.
            A 1" tweeter should most likely be good to about 2.2-2.5kHz in most cases. Some may have HD profiles that don't allow usage below 3k, or even 4k for some; but decent 1" tweeters should meet that range.
            The SB is a 29mm dome, which both loses some off-axis response due to being a ring-radiator and also being said 29mm diameter. A lot in this size factor are capable of the 1.8-2kHz range, and the SB (being the neo-motor version with smaller chamber) should likely suit well to 2.2k at the least.

            As to why I mention it- The RS125P is capable of the higher xover point, but it may have a better summation and sound more seamless with better directivity if you xover a bit lower.
            Later,
            Wolf
            "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
            "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
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            • #21
              Just completed a build using SB29RDAC-C000-4 crossed at 1,750hz to an RS180P. With an fs of 600hz the SB is pretty happy down here - no issues at all. Impressed enough with this combination that I'm working on MKII now and planning to keep the crossover point.

              Originally posted by tolstoy View Post
              Would a purchase of a miniDSP UMIK-1 and the download of Boxsim get me what I need to be more effective?
              If your wanting to design your own speakers from scratch its essential, not just more effective.

              UMIK USB microphone is probably the simplest for getting into measurements. I don't know how it compares to Dayton OmniMic. I personally use either Dayton EMM6 or Behringer condenser mics with a digital interface.

              In terms of box simulation WinISD (http://www.linearteam.org/) is popular and free.

              XOver simulation you've already discovered x-sim obviously. I prefer VituixCad (https://kimmosaunisto.net/) personally but both work really well. There is also a spreadsheet that's popular with a lot of members here (http://audio.claub.net/software/jbabgy/PCD.html).

              I believe the UMIK mic will come with some measurement software (?) but you can also use REW (https://www.roomeqwizard.com/) or Holm (http://www.holmacoustics.com/holmimpulse.php) for free.

              In terms of designing from scratch I also find the software Edge (http://www.tolvan.com/edge/help.htm) good for modelling baffle step along with another spreadsheet "Diffraction & Boundary Simulator" (http://audio.claub.net/software/jbabgy/BDBS.html). And I would also recommend BoxNotes (https://www.subwoofer-builder.com/freesoft.htm) as a handy tool to help understand the resonant frequencies inherent in any box design.

              Its also worth considering the DATS (https://www.parts-express.com/Dayton...System-390-807) system from Dayton (or similar from CLIO) to test speakers and crossover components. You can find various guides etc for making little jigs and running the same tests using your soundcard/interface to obtain speaker parameters, and in particular the impedance response, but if you'd rather skip all that, DATS is the way to go.

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              • #22
                Thanks for all the help. I don't own any of these drivers as of yet. I was just playing with Xsim and what data I could collect either from PE for the Dayton drivers and other sources for the tweeter to see what might play well together, and to get an idea if I have at least some idea of how the crossover software works.

                Because I didn't have access to equipment necessary to make my own measurements, I was confining my search to drivers that I could get FRD/ZMA data without doing my own measurements. I now plan to get the UMIK mic so that I can do my own measurements. Because of this development, I've widened my search to include drivers that I don't yet have FRD/ZMA data for, but that I like the looks of and whose specs seem to work well with what I want to do.

                I've now narrowed in on the HIVI Tn25 and the FaitalPRO 5FE120. I've modeled an enclosure of .3cuft with a 2in port roughly 1.75inches long. I plan to purchase these drivers, assemble an enclosure, and do measurements of the drivers inside the box to develop the data needed to design a crossover.

                I'd like to order the drivers soon, any problems you guys see with pairing these two?

                Tolstoy

                The sun is the same in a relative way, but you're older. Shorter of breath and one day closer to death.
                Last edited by tolstoy; 02-27-2021, 06:37 PM.

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