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Event Horizon: a slim, wall-mounted WMTMW

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  • Event Horizon: a slim, wall-mounted WMTMW

    Coming soon... to a living room in my house ;)



    It uses the Dayton ND105-4 + Dayton ND90 + Dayton ND20FB, all rear-mounted. (Yes I finally figured out a way to take the ugly out of those damned pincushion frames. More on that in a bit. For now, here's a teaser)


    This project was an idea generated by my wife. She wanted something slim and wall-mounted for our living room. Believe it or not, she wanted lots of drivers--a mini line array, if possible!
    This created a laundry list of challenges:
    1. The enclosure had to be small, and maximize its use of space. Anything wider and deeper than 6" was too much. But you can't get too long, either, or it just looks silly. I decided no longer than 32". So, that limits our total box volume to something around 11 Liters, max.
    2. There are very few drivers out there that will put out any sort of respectable bass in 11 Liters. A 5" woofer is way too much; a single 5" driver needs that much space on its own to get decent bass. 3" woofers might work, if you get enough of them. But even the venerable Aura-derived NS3 (Dayton ND90) could only get down to the mid-50 Hz range. What's left? 4" drivers; and even those are a push, though there are a few that can get respectable bass.
    3. Everything has to be as lightweight as possible. 3/4" MDF creates very heavy cabinets--great for floorstanders, not so good for wall-hanging. Plus, that thick stock eats up valuable interior space: so 1/2" MDF it is. As for drivers, if I could find neodymium motors, that'd be a plus, since they're lighter in weight (this was before the neodymium fiasco we are now witnessing)

    One driver I thought would work would be the Dayton ND105-4 and/or the ND90. But I had to find a way to hide those ugly frames. I searched around this board and the internet to see if any DIYers had found ways to mask it, and finally found someone who had the right idea (I apologize that I don't remember who it was. But I remember he had converted an old Minimus-7 to use an ND90 and cleverly rear-mounted the driver with just the right amount of recess so it didn't look silly.) And that's just what I did. I used the ND20FB to complete the ensemble. (Oh, and I just freehand-routered the bits around the nuts--a step which ended up being unnecessary)


    Still, fitting all that into the cabinet and making sure the drivers all got the appropriate volume was a bit hard. The outside drivers needed 4.5 Liters each; the inside woofers would have to make do with about 2 Liters for the pair. It's a tight fit, for sure--but it fits no problem, with about 1/2" of play. (Kind of reminds me of how tightly packed car engines are nowadays compared to 30 years ago.)


    So what about some real details. Well, the F3 is probably in the upper 40's. It sounds spacious and images pretty effortlessly. It can stand on its own without a sub (as it will probably have to in my living room), but to turn on the sub is just dreamy. With a sub, the sound is huge and room-filling... makes you feel like you've gone weightless.

    And what about that name? Well, my wife kept insisting on a name like the "wife pleasers," but I thought that name had too many other connotations :rolleyes:. (She figured this is a speaker with very high WAF. Get your heads out of the gutters, guys!) After deliberating, experimenting, trashing this design many, many times over the last year, I started feeling like it was this unattainable vision. A threshold I wasn't sure if I'd ever make it across--an Event Horizon!

    Measurements and XO to follow soon. Just want to do some more measurements and put them through some more strenuous tests. Sorry for the long-winded writeup. But I've been through so much rigor to get this thing, that I can't help but have a lot to say.
    Attached Files
    Isn't it about time we started answering rhetorical questions?

    Paul Carmody's DIY Audio Projects
    Twitter: @undefinition1

  • #2
    Re: Event Horizon: a slim, wall-mounted WMTMW

    Amazing Paul! I have been waiting for someone to marry the ND90 and ND105 for quite some time now. Can't wait to hear how they sound!

    Comment


    • #3
      Re: Event Horizon: a slim, wall-mounted WMTMW

      I just found my next build.

      Comment


      • #4
        Re: Event Horizon: a slim, wall-mounted WMTMW

        And just think . . . you could use a pair of New Horizons as "matching" surrounds.

        Comment


        • #5
          Re: Event Horizon: a slim, wall-mounted WMTMW

          Congratulations. This means you solved your xo issue. Anxiously awaiting the details so I can steal a few ideas!
          John H

          Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

          Comment


          • #6
            Re: Event Horizon: a slim, wall-mounted WMTMW

            nice paul. did you consider a topper baffle with roundovers to hide the screws?
            wonder how that would affect the response.
            " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

            Quote Originally Posted by hongrn. Oct 2014
            Do you realize that being an American is like winning the biggest jackpot ever??

            http://www.midwestaudioclub.com/spot...owell-simpson/
            http://s413.photobucket.com/albums/pp216/arlis/

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            • #7
              Re: Event Horizon: a slim, wall-mounted WMTMW

              Ooh. I like this project. Good for you! ;)

              Bill
              The first one through the wall always gets the bloodiest...

              Comment


              • #8
                Re: Event Horizon: a slim, wall-mounted WMTMW

                Wow. If I ever get the budget, time, and woodworking skills to upgrade my wallhangers, that's it right there. Nice job.
                There's a good chance I don't know what I'm talking about.

                Comment


                • #9
                  Re: Event Horizon: a slim, wall-mounted WMTMW

                  AWESOME!

                  Man those look cool. Love how you hid those cheap looking flanges.
                  Form does not follow function
                  Form is simultaneous to function

                  Comment


                  • #10
                    Re: Event Horizon: a slim, wall-mounted WMTMW

                    Those look awesome! My wife loves the idea! I do have a quick question though. Are you making the back (or baffle) removable so that you can install/remove the drivers?

                    Also, I'd be interested in replacing my living room speakers! I wonder if they'd look odd on either side of a 92" screen...

                    Comment


                    • #11
                      Re: Event Horizon: a slim, wall-mounted WMTMW

                      Any concern that the mdf is very thin where the drivers are mounted?
                      Form does not follow function
                      Form is simultaneous to function

                      Comment


                      • #12
                        Re: Event Horizon: a slim, wall-mounted WMTMW

                        Originally posted by brianbunge View Post
                        Are you making the back (or baffle) removable so that you can install/remove the drivers?
                        The front baffles will be removable. I just haven't drilled the holes and installed the T-nuts yet. (I've just had them clamped in place) It might be possible to do a removable back, but that mid chamber might be a bit cramped to fit your hand and a wrench.

                        I wonder if they'd look odd on either side of a 92" screen...
                        Well, OK... I honestly hadn't thought of that situation. :eek: My recommendation would be to make the enclosures longer to give the woofers more volume. In this cabinet, the ND105-4 can do some bass, but I can tell they'd like to be set free to dig nice and deep. :D

                        Originally posted by lunchmoney View Post
                        Any concern that the mdf is very thin where the drivers are mounted?
                        I was concerned about that initially. However, after my own rough handling of the baffles, and playing lots of music through them, I think it's OK. I've created my share of cabinets with weak spots, so I've learned to scope out those kind of problems. With larger drivers (especially with ferrite magnets), the thinness of the baffle would be a genuine concern, and probably easy to notice as well. But as it is, holding the baffle "fully loaded" with drivers and ports weighs very little.
                        Isn't it about time we started answering rhetorical questions?

                        Paul Carmody's DIY Audio Projects
                        Twitter: @undefinition1

                        Comment


                        • #13
                          Re: Event Horizon: a slim, wall-mounted WMTMW

                          Paul, looks like a fun system! Do you have ND105-4 measurements (on/off axis) you can share? Looking to compare to some results I took in a JD box.


                          Thanks,

                          Dave

                          Comment


                          • #14
                            Re: Event Horizon: a slim, wall-mounted WMTMW

                            Very nice speaker! Would it be a deal breaker to go ahead and flush mount the drivers, if anything other than me being lazy?

                            BTW, I love my overnight sensations.

                            Thanks for your contributions to all of us.

                            Wem

                            Comment


                            • #15
                              Re: Event Horizon: a slim, wall-mounted WMTMW

                              Somewhat similar to a design by Dave Thomas I found when I entered this mad world of DIY. The design was not widely discussed. It is a MMMTTMMM sealed configuration. Following Zaph's comments regarding the B3N I XO to the subs at 150 Hz. Obviously, your design digs much lower. As seen in the photographs, I had to wall mount the L/R speakers.

                              The L/R are simple 3/4 inch MDF boxes 5W x 9D x 35 H. Added side bracing, lined with egg crate foam and light stuffed. Box is over sized so added wood blocks to reduce volume.

                              The speakers has 6 HiVi B3N's and 2 Dayton neos in hand routed recesses on baffle back to bring the tweets flush with front of baffle.

                              Center took a little more work with the angled baffle being the challenge for mounting and sealing (sealed enclosure).



                              "In order to really enjoy a dog, one doesn't merely try to train him to be semi-human. The point of it is to open oneself to the possibility of becoming partly a dog." - Edward Hoagland

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