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Boom box build (another one, but first for me)

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  • Boom box build (another one, but first for me)

    Two converging events... I won a pair of ND105-PR at MWAF 2018, and my daughter (11) wants her own speaker.

    This is the plan.. a Sprite style box using the PRs instead of ports, all 4 cones up front will look awesome. Powered by the KAB 50W board and a battery pack. It will run at 12V so not too much power for the ND90-4 (bought on flash sale!).

    Construction will be from 1/4" stock and braced for lighter weight. I anticipate a lot of bondo since I'm not tooled for small cuts. Finish in white Duratex, tinted for some pink.

    Clever name TBD. My wife suggested Shia LeBoom LOL.
    Electronics engineer, woofer enthusiast, and musician.
    Wogg Music
    Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus

  • #2
    3"ers are (marginally) okay w/out a tweeter, but not the 4"ers. (Maybe your daughter won't mind, though.)

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    • #3
      Originally posted by Chris Roemer View Post
      3"ers are (marginally) okay w/out a tweeter, but not the 4"ers. (Maybe your daughter won't mind, though.)
      Agreed, and she won't ;) I plan on doing measurements and using a compensation filter for some baffle step and keeping the highs up as much as reasonable. The drivers are pointing about 16 degrees out either side for some spread. As long as it fills a room she'll be thrilled.
      Electronics engineer, woofer enthusiast, and musician.
      Wogg Music
      Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus

      Comment


      • #4
        Personally, ... mount the NDs behind the baffle. And if you have a router contour the cutouts. I think that looks sharp compared to the ND series mounted up front. For a more practical reason, the drivers will have a little more protection being recessed. Add some black, flat-head, Allen socket screws to mount them and you have a "manufactured" look.

        Below, see where I "doctored" the pic to show the recessed, flat-head screws. Better looking IMHO - very important to young women


        Click image for larger version

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        • #5
          Looks like a cool project. If you mount small drivers from the back, I would suggest #8 x 1/2" wood screws from the back, not visible from the front at all. Use flat washers if needed.

          I think you are on the right track with a simple contour filter, it shouldn't take much to get these drivers to cooperate. I expect the highs will be just fine also.

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          • #6
            Originally posted by Billet View Post
            I would suggest #8 x 1/2" wood screws from the back, not visible from the front at all.
            A very good idea as well.

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            • #7
              Originally posted by Billet View Post
              Looks like a cool project. If you mount small drivers from the back, I would suggest #8 x 1/2" wood screws from the back, not visible from the front at all. Use flat washers if needed.

              I think you are on the right track with a simple contour filter, it shouldn't take much to get these drivers to cooperate. I expect the highs will be just fine also.
              Yes, the half inch #8 screws from PE work great for rear mounting. I didn't have any go through, without using washers too.
              Click image for larger version

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              • #8
                Originally posted by amzounslide95
                I would look into two bookshelf sized high sensitivity speakers and integrate it into the box. Add a sub and a 2.1 plate amp.
                You must be a strong guy to be able to carry all that around with you
                Francis

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                • #9
                  Lesson (Mr. AmzoBOT), "bookshelf sized" and "high sensitivity" aren't often compatible.

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                  • #10
                    Originally posted by amzounslide95
                    I would look into two bookshelf sized high sensitivity speakers and integrate it into the box. Add a sub and a 2.1 plate amp.
                    Nope... missing the main point. I had the PR's on hand and have the rest of the materials ready to go. I like the idea of self powered bookshelves, but they're way less practical for a kid who wants music flexibility.
                    Electronics engineer, woofer enthusiast, and musician.
                    Wogg Music
                    Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus

                    Comment

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