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Need help with DMLs (exciter + material selection)

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  • Need help with DMLs (exciter + material selection)

    So I got the DAEX32Q-8 exciters to mount to some 2x2 EPS boards. To put it short it sounds terrible out of the box. Like a clock radio.

    I'm mostly ready to start over but I don't know what the problem is. Are these exciters no good? Looking more into it it seems DAEX25HF-4 is more what I'm looking for. Good all around sentitivity and relatively flat response. Will still need EQing but not 20-30dB like the EX32s.

  • #2
    There is a thread here called something like "Flat panel love" - sorry, I don't know what an "EPS" panel is.
    Good results noted with using the 1/2 inch styrofoam insulation panels at Home Depot and Lowes (but be careful, they are very flammable)
    Other people talk about 1/4 inch plywood. Bass response is mostly determined by the size of the panel.
    I played with it, and really liked the immersive quality of the sound.
    Have fun!

    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!
    SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
    My Voxel min sub Yet-another-Voxel-build

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    • #3
      Did have some rather decent ungated measurements but my dml experiments, implementing the daex32ep-4 on blue/pink foam board or treated cardboard, ended when PE would no longer warranty the very short lived exciters. I suspect the +/- panel movement of a large panel trying to generate adequate levels of bass was driving the exciter past its excursion limits and the solid leads from terminals to voice coil were the weak point. My next exciter would have been one of the higher power Techtonics since they had a braided lead which should have been much less susceptible to breakage while being bent.

      Some of the aha moments were realizing the panel wanted to be free from whatever was holding it in place and the back of the exciter needed to be solidly supported.

      They are little more than a regular speaker missing everything that connects to the cone and I suspect to do a full range speaker with enough output to satisfy most, it would take a smaller exciter for the mids and higher and something like a bass shaker for the lower notes, not unlike a normal speaker, crossover included, although, with creases, or a way to partition the soundboard, it might be a possible to accomplish a two-way on one sheet of whatever material you use.
      http://techtalk.parts-express.com/fo...khanspires-but
      http://techtalk.parts-express.com/fo...pico-neo-build
      http://techtalk.parts-express.com/fo...ensation-build

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      • #4
        I would be running these with a subwoofer and HPF so hopefully I won't have any excursion related issues. I used 1" thick panels, but others have had good builds with them, so I feel like panel thickness isn't the issue. I do have some other materials to try though. Exciters will come Wednesday I think so we will see how they do then.

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        • #5
          Foamboard had a nasal?or drummy? quality I could never negate with coating or carving it into other shapes. Honestly, IIRC, treated cardboard had a more natural sound character. You can search my username inside the big dml thread to see where I've been. Already had the lexan waiting for the next dml experiment but after the last exciter stb before measurements could be completed, I'd had enough.
          http://techtalk.parts-express.com/fo...khanspires-but
          http://techtalk.parts-express.com/fo...pico-neo-build
          http://techtalk.parts-express.com/fo...ensation-build

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          • #6
            These two videos have had a lot of views, but are on-topic on the materials question.





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            (a lofty notion since removed in the March 2015 revision)

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            • #7
              Kornbread it looks like I can only find posts where people quote you. That thread is a little too big to be useful unless I really sit and read through all ~90 pages.................

              I got the Dayton DSP-408 and a little calibrated mic, so hopefully I can tune them out. There is soooo much midrange sensitivity it's insane. Compared to my B652-AIRs... which I know are not great but are my reference.... sounds like there's 10dB of midrange I can cut. That with a healthy treble boost should fix it.

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              • #8
                If you aren't already listening with the subwoofer on, try that...without the subwoofer playing, I think you'll have trouble getting lows under 150hz which can make anything start to sound like a clock radio.
                My first 2way build

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                • #9
                  I do have a sub and have an 80 Hz HPF. But I am thinking about running a higher HPF through the DSP. I think I am going to have to ditch the tube amp though.

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                  • #10
                    Dropping the midrange down with DSP can often make a big difference.
                    Parts Express Engineer

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                    • #11
                      Originally posted by SAC View Post
                      Kornbread it looks like I can only find posts where people quote you. That thread is a little too big to be useful unless I really sit and read through all ~90 pages.................

                      I got the Dayton DSP-408 and a little calibrated mic, so hopefully I can tune them out. There is soooo much midrange sensitivity it's insane. Compared to my B652-AIRs... which I know are not great but are my reference.... sounds like there's 10dB of midrange I can cut. That with a healthy treble boost should fix it.
                      Search>advanced search>Keywords=flat panel love>Members=Kornbread>view=default. Leave everything else as is. Should be about 4 pages of stuff. Good luck with the dsp-408.
                      http://techtalk.parts-express.com/fo...khanspires-but
                      http://techtalk.parts-express.com/fo...pico-neo-build
                      http://techtalk.parts-express.com/fo...ensation-build

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