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Rebuilding my College Speakers

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  • Rebuilding my College Speakers

    Back in high school and college I had a few different 12" 3-way speakers. I built them all with off the shelf crossovers and what little I knew about speaker design. One of the biggest reasons I bought the equipment to build my own speakers, was to build another 3-way using a 12" driver but with a proper crossover. I know this is probably not a popular design, but it is something I have always wanted to do. I also can see why a lot of people would not want to do this, since the speakers are super heavy. I am guessing over 100lbs per at this point. I will weigh them with a bathroom scale at some point just for my curiosity. The drivers I chose where the Dayton DSA315-8 for the woofer, the Faital Pro 4FE35 8 ohm for the midrange, and the Peerless XT25BG60-04. I chose the tweeter, because it is my favorite tweeter that I have heard (I have not heard a ton, but I like this one). I chose the midrange due to its high sensitivity of 91db and its flat response over the midrange, and the DSA315-8 because it would go relatively low in a not so huge enclosure, at a reasonable price.

  • #2
    The woofer modeled well in just over a 3 cubic foot enclosure with an F3 of just over 27 hz. This will give me right around 107db before xmax. That is about all I can get out of the singe midrange, so that should be enough.
    Attached Files

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    • DeZZar
      DeZZar commented
      Editing a comment
      Don't forget baffle step loss.

  • #3
    I started building the enclosure, and have it ready for measurements. It is pretty well braced, and I lined it with mineral wool.
    Attached Files

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    • #4
      Here are a few more views.
      Attached Files

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      • #5
        Here they are ready for measurements. I put them up on a ladder outside a couple days ago, and that was a hell of a job. These things are heavy, but measurements inside with these made it nearly impossible to create the woofer part of the crossover.
        Attached Files

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        • #6
          As you can see above, I machined a beauty ring to cover up the mounting of the Faital Pro driver. Its a good sounding driver, but I assume no one uses it, because it is ugly. This ring makes it look a lot better. So I started the crossover today as I had the day off. I have designed this about 3 times, and I think I have it looking good enough to order the first round of crossover parts. It's not perfect, but it does sim to +/- 1.5db.
          Attached Files

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          • #7
            Looks good! Beefy cabinets, how are you going to finish them? XO looks decent.

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            • #8
              I will be painting the baffle black and veneering the rest with cherry. I will also be matching some adjustable feet or outriggers for them. Sent from my SM-G973U using Tapatalk

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              • #9
                Nice. Gonna power them with some vintage chrome, or something modern?

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                • #10
                  Those look like they took an incredible amount of effort.

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                  • #11
                    Chrisn, I will be powering these with a Yamaha RX-V661 as a preamp and an Emotiva UPA-2 that I repaired. I also have my Yamaha RX-V490 that I bought in 1994 when I was 14 that I may have to try.

                    Steve, so far they haven't been too bad. I think veneering these will be interesting as big as they are. I will definitely be spending a lot of time finishing them once the crossover is complete. I don't like to finish anything until I am done tweaking. I have caused damage in the past when I don't wait.

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                    • #12
                      Nice work, super heavy. Off topic, but what's that motorcycle peaking out from the background please?

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                      • #13
                        Originally posted by djg View Post
                        Nice work, super heavy. Off topic, but what's that motorcycle peaking out from the background please?
                        That is a 1978 Honda CB750K. My dad bought it brand new, and I learned to ride on it. Now we are upgrading and restoring it a bit. I have a motorcycle problem along with my speaker problem 🙃 Sent from my SM-G973U using Tapatalk

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                        • djg
                          djg commented
                          Editing a comment
                          Thank you. My age has put me on a Vespa with a Texas Sidecar sidecar rig. Last motorcycle was a Kawasaki Versys 650.

                      • #14
                        Nice work!
                        Francis

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                        • #15
                          Really nice work. Looking forward to seeing how these turn out.

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