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  • Another OCD build

    The drivers are:
    Peerless 6.5" HDS http://www.parts-express.com/pe/show...number=299-281
    and the Vifa XT25TG30 http://www.parts-express.com/pe/show...umber=264-1016
    I'm on my second x-over version so far, but the drivers are nice! Comparing this to my last build, using 2 Klipsch 6.5's and a cheap tang band tweeter, made me realize the important of quality drivers (not just the crossover.)

    The speakers were requested by my father to give as a present to a business friend of his. I know nothing about him, except he is:
    -financially "well-off"
    -has no problem spending $400 on Bose earphones.

    My goals:
    -Build speakers with removable front and rear baffles. (just to try out)
    -Don't require a sub
    -Small(ish) size. Something like a monitor or slightly larger
    -sound good to an "audiophile" that knows nothing about DIY speakers

    the last is the hardest to accomplish, and I have no way to judge.

    Because of the impressive low end of the Overnight Sensations, I decided to not skimp on the port tuning. I envisioned these as a better, higher-end version of the OS's because the drivers were better and box was larger. I'm sure the x-overs are far from better, but that's where I'd hope the driver quality comes in. The removable rear baffle is really the only reason I even compared them. My idea for the rear baffle came from here via williamrschneider:http://techtalk.parts-express.com/sh...d.php?t=212179


    The box is 3/4"birch ply with another layer of fiberboard/hardboard on the outside. The hardboard was used primarily to provide a smooth surface although it does add strength, which is nice.


    I needed a larger diameter port, but didn't have the PVC. To minimize chances of chuffing on the smaller size, I flared the ends of what I had with a heat gun and a professional mold. I just heated it and rotated it as I pushed the pipe down on the mold.



    Next, I drilled an inset for the PVC and used Gorilla glue, or similar, to glue the port onto the back plate. It seems to work the best for PVC, but it's not my favorite glue.



    I then used a roundover on the other end of the port.


    The front and back are 3/4MDF that are attached by 1/4-20 Hex cap screws with a layer of gasketing tape between. Hurricane nuts are glued to mdf braces.

    Here you can see how the back is routed out


    And how the back fits...


    To finish them, I used "rattle-can" sprayable bedliner on the front and back and "black ash" vinyl laminate on the sides of the cabinet.







    I'll add the speaker terminals when I finalize the crossover...
    EDIT: This is the final crossover:
    Last edited by ocdSCHACK; 03-03-2011, 08:17 AM.

  • #2
    Re: Another OCD build

    Those are looking great so far! I like you use of the "professional mold" to shape the PVC! Keep us posted...I'm a big fan of the Peerless HDS series.
    Co-conspirator in the development of the "CR Gnarly Fidelity Reduction Unit" - Registered Trademark, Patent Pending.

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    • #3
      Re: Another OCD build

      Nice...

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      • #4
        Re: Another OCD build

        Very nice!

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        • #5
          Re: Another OCD build

          beautiful low-budget finish to those cabinets! Thanks for the suggestion....

          I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
          "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

          High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
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          • #6
            Re: Another OCD build

            I love the look of a rear mounted woofer, I'm going to have to get up the guts to actually try it someday...very nice looking project!

            Oh and I notice that the professional mold is missing its internal ballast...:D


            Mark
            You go your way, I'll go mine. I don't care if we get there on time.

            ~Pink Floyd

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            • #7
              Re: Another OCD build

              Originally posted by Mark65 View Post
              I love the look of a rear mounted woofer, I'm going to have to get up the guts to actually try it someday...very nice looking project!

              Oh and I notice that the professional mold is missing its internal ballast...:D


              Mark
              +1 on the rear mounted woofer.
              Mark
              My TriTrix Build
              My Core 2 Way Build
              My RSS315HF-4 Subwoofer Build

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              • #8
                Re: Another OCD build

                Originally posted by Mark65 View Post
                I love the look of a rear mounted woofer, I'm going to have to get up the guts to actually try it someday...very nice looking project!

                Oh and I notice that the professional mold is missing its internal ballast...:D


                Mark
                I think its way easier than flush mounting. If the baffle is too thick, or the driver is too small, I worry it might effect the sound off axis. I usually like the look and the ease of it though.

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                • #9
                  Re: Another OCD build

                  Originally posted by ocdSCHACK View Post
                  I think its way easier than flush mounting. If the baffle is too thick, or the driver is too small, I worry it might effect the sound off axis. I usually like the look and the ease of it though.
                  Looks great.

                  How did you secure the driver to that 3/4" mdf baffle so that the screws don't protrude out the front?

                  Louis

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                  • #10
                    Re: Another OCD build

                    Nice build, I like the finish, Smart! I also like the way you flared the PVC pipe, much better than rounding over...maybe that'd work for both ends? I gotta get me some Bacardi:D

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                    • #11
                      Re: Another OCD build

                      Originally posted by Ludo View Post
                      Looks great.

                      How did you secure the driver to that 3/4" mdf baffle so that the screws don't protrude out the front?

                      Louis
                      I measured the roundover and it didn't cross, or barely crossed, where the screws would protrude. So... I used 3/4" long screws and a hand powered screwdriver. No power tools when it came to mounting.:eek:

                      EDIT: I recommend large thread screws. Small threads won't bite well enough and might strip the MDF.
                      Last edited by ocdSCHACK; 12-15-2010, 08:06 AM.

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                      • #12
                        Re: Another OCD build

                        Originally posted by Hal H View Post
                        Nice build, I like the finish, Smart! I also like the way you flared the PVC pipe, much better than rounding over...maybe that'd work for both ends? I gotta get me some Bacardi:D
                        If you use a roundover bit on a router, you shouldn't need the flare on the wood side. I do still recommend the Bacardi...just in case.

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                        • #13
                          Re: Another OCD build

                          Louis- I think I would have 'clamped' the driver instead of using screws in this case.
                          Just my 2c,
                          Wolf
                          "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
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                          • #14
                            Re: Another OCD build

                            Originally posted by Wolf View Post
                            Louis- I think I would have 'clamped' the driver instead of using screws in this case.
                            Just my 2c,
                            Wolf
                            Clamped as in using wood strips to "clamp" the driver in place? I like the look of rear mounted drivers, but have always wondered about how to secure them properly so that the mounting screws don't show.

                            Oh, and I dig the build OCD...very clean looking!

                            -j

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                            • #15
                              Re: Another OCD build

                              What brand of bedliner is that? It looks very even. Did it only take one can?

                              Looks great!

                              Blair

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