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  • In my other post #881 on the description of spruce wood this is what intrigued me the most when it said> it’s another wood with a hard skeleton and soft meat.

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    • [QUOTE=Unbiasedsound;n1282783]In my other post #881 on the description of spruce wood this is what intrigued me the most when it said> it’s another wood with a hard skeleton and soft meat.[/QUOTE
      I wonder how or if the surface of the JMC soundpanel is treated, such as a lacquer or some sort for hardening or stiffening solution is used. It's been said that the wood on a Stradivarius violin has been treated in some special way and is responsible for it's sought after tone quality.
      In my walks, every man I meet is my superior in some way, and in that I learn from him.

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      • [QUOTE=captainjack115;n1282863]
        Originally posted by Unbiasedsound View Post
        In my other post #881 on the description of spruce wood this is what intrigued me the most when it said> it’s another wood with a hard skeleton and soft meat.[/QUOTE
        I wonder how or if the surface of the JMC soundpanel is treated, such as a lacquer or some sort for hardening or stiffening solution is used. It's been said that the wood on a Stradivarius violin has been treated in some special way and is responsible for it's sought after tone quality.
        This is what I found on the finishings> http://www.lmii.com/finishing-options

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        • Hey everybody, this is my first post, I hope it's worthy. I haven't read the whole thread yet, but I've built a couple pairs of flat panels using the foamular boards and really like the way they sound. I was about to throw away a couple of styrofoam shipping boxes and couldn't resist experimenting with one. If someone already did this I apologize for the redundancy, but I've only read about halfway through the thread so far. I don't have anyway of making technical measurements, but it sounds pretty good to me for a cooler full of ice, beers and sodas. It uses two DAEX32U-4s (one one either side), driven with a little five watt stereo amp powered by 8 AA cells and sourced from my phone. I 'm thinking of a few improvements and would welcome any suggestions, comments, or criticisms.

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          • Originally posted by waxburger View Post
            Hey everybody, this is my first post, I hope it's worthy. I haven't read the whole thread yet, but I've built a couple pairs of flat panels using the foamular boards and really like the way they sound. I was about to throw away a couple of styrofoam shipping boxes and couldn't resist experimenting with one. If someone already did this I apologize for the redundancy, but I've only read about halfway through the thread so far. I don't have anyway of making technical measurements, but it sounds pretty good to me for a cooler full of ice, beers and sodas. It uses two DAEX32U-4s (one one either side), driven with a little five watt stereo amp powered by 8 AA cells and sourced from my phone. I 'm thinking of a few improvements and would welcome any suggestions, comments, or criticisms.
            Welcome to this thread:

            Most of us are learning as we go along, rmienke started this thread and probably has the most experience here with DML panels.
            Your cooler idea looks intriguing. Are you getting any buzzing or self noise?
            In my walks, every man I meet is my superior in some way, and in that I learn from him.

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            • [QUOTE=Unbiasedsound;n1282889]
              Originally posted by captainjack115 View Post

              This is what I found on the finishings> http://www.lmii.com/finishing-options
              Hmm, the water based lacquer might be worth a try. The trick would be to find a relatively inexpensive piece of tonewood for experimenting.
              In my walks, every man I meet is my superior in some way, and in that I learn from him.

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              • [QUOTE=captainjack115;n1282944]
                Originally posted by Unbiasedsound View Post

                Hmm, the water based lacquer might be worth a try. The trick would be to find a relatively inexpensive piece of tonewood for experimenting.
                I bought me a small can of Lacquer for $13.99 today......now if I can just find a decently priced tone wood. lol....I do have a 1/8 birch ply that I can experiment on just too see how it sounds with the treatment....or I could even try it on some EPS but not sure of its corrosive properties on eps as even oil based paints can corrode eps.

                P.S. I just tested it on EPS and its corrosive as beep. LOL

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                • [QUOTE=Unbiasedsound;n1283015]
                  Originally posted by captainjack115 View Post

                  I bought me a small can of Lacquer for $13.99 today......now if I can just find a decently priced tone wood. lol....I do have a 1/8 birch ply that I can experiment on just too see how it sounds with the treatment....or I could even try it on some EPS but not sure of its corrosive properties on eps as even oil based paints can corrode eps.

                  P.S. I just tested it on EPS and its corrosive as beep. LOL
                  Was that lacquer water based? EPS sure is touchy when it comes to putting chemicals on it. I wonder just how much difference there would be between 1/8 birch ply and a similar thickness of quarter sawn tonewood. I have a Menards home improvement store within walking distance from me, it wouldn't hurt to ask if they have or can get tonewood.
                  In my walks, every man I meet is my superior in some way, and in that I learn from him.

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                  • What is it they make model airplanes from? Balsa? Should be cheap so if things don't work out no biggy. 1/16x12"x24" $8 http://www.nationalbalsa.com/balsa_s.../1161224sh.htm
                    Try it naked first then treat. I'm thinking it should readily absorb lacquer (what might work better?) and depending on how much you put into it might have some control of flexibility and hardness.

                    Just a thought.
                    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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                    • [QUOTE=captainjack115;n1283103]
                      Originally posted by Unbiasedsound View Post

                      Was that lacquer water based? EPS sure is touchy when it comes to putting chemicals on it. I wonder just how much difference there would be between 1/8 birch ply and a similar thickness of quarter sawn tonewood. I have a Menards home improvement store within walking distance from me, it wouldn't hurt to ask if they have or can get tonewood.
                      No, they didnt have the water based lacquer, so I just bought the one they did have just too experiment. There is a way to put the lacquer on the EPS though by using the 50/50 water/glue mixture on first let it dry then put the lacquer on it as the finishing coat....the glue/water mixture prevents the lacquer from corroding the eps.
                      Last edited by Unbiasedsound; 05-25-2016, 02:10 AM.

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                      • [QUOTE=Unbiasedsound;n1283138]
                        Originally posted by captainjack115 View Post

                        No, they didnt have the water based lacquer, so I just bought the one they did have just too experiment. There is a way to put the lacquer on the EPS though by using the 50/50 water/glue mixture on first let it dry then put the lacquer on it as the finishing coat....the glue/water mixture prevents the lacquer from corroding the eps.
                        Sounds like that would work!
                        Having a hard shell surrounding an otherwise dampened material sounds ideal.
                        About 6 years ago I tried a thin gauge of aluminum, I then surrounded the exciter with a piece of extruded eps glued to the aluminum. The result was a nice sounding panel with good highs.
                        The bad news was a huge loss in sensitivity, thinner EPS backing didn't work either, although louder the resonance of the aluminum sheeting reared it's ugly head.
                        So far all materials tried for wide range have had a common denominator problem, namely edge mounting.
                        In my walks, every man I meet is my superior in some way, and in that I learn from him.

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                        • Originally posted by captainjack115 View Post

                          Welcome to this thread:

                          Most of us are learning as we go along, rmienke started this thread and probably has the most experience here with DML panels.
                          Your cooler idea looks intriguing. Are you getting any buzzing or self noise?
                          Thanks for the welcome Captain!
                          I did get a little buzz while testing it, but I don't think that's what you're talking about . It really sounds pretty good to me. I'm not sure what self noise is, what would that sound like, rattles or clicks/pops, static maybe? I didn't notice any of those. I want to try making a pair of speakers with one exciter mounted on the bottom of each box, but all three of the containers I have are different sizes/dimensions, so it might not work out very well. I'll post again when I get them together.
                          Cheers!

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                          • [QUOTE=captainjack115;n1283173]
                            Originally posted by Unbiasedsound View Post

                            Sounds like that would work!
                            Having a hard shell surrounding an otherwise dampened material sounds ideal.
                            About 6 years ago I tried a thin gauge of aluminum, I then surrounded the exciter with a piece of extruded eps glued to the aluminum. The result was a nice sounding panel with good highs.
                            The bad news was a huge loss in sensitivity, thinner EPS backing didn't work either, although louder the resonance of the aluminum sheeting reared it's ugly head.
                            So far all materials tried for wide range have had a common denominator problem, namely edge mounting.
                            I have also tried aluminum and other sheet metals but like you've mentioned the sensitivity drops and there tone is one that my ears tend to not like.

                            I found this old review on Bertagnis flag ship speakers the SM300 which is the eldest sibling to my SM100's> http://www.hifi-classic.net/review/bes-sm300-289.html

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                            • My order arrived.....tested out the Tectonics TAEX19C01-8 19mm vs the Dayon DAEX19QLP-4 19mm.....The tectonics IMO has a little higher frequency response, a little better bass and cleaner sounding then the dayton.

                              When it comes too the high frequency extension the best exciter so far IMO is the smaller Tectonics HIAX13C02-16/RH 13mm exciter while the bigger TAEX19C01-8 would be second.....This convinces me further that the smaller voice coils have a higher frequency extension and that there is a difference in the sound when it comes to different brands.

                              For fuller range use though I would not suggest the Tectonics HIAX13C02-16 13mm as it lacks midrange and sounds more like a tweeter....anything 19mm and up will have more mid range and a fuller sound.

                              I also bought those panasonic clearance 2 way cross overs with the mid at 200hz and the tweeter at 5.5khz. Used the two techtonics exciters I mentioned above the 19mm for the mid and the 13mm for the tweeter and wow that combo sounds great with this crossover and for only 2 bucks each its a steal of a deal. Even at 200hz there is a good mid bass presence. ...now the dayton XO 2 way cross overs do sound better but at over 10 times the cost of the panasonic lol.
                              Last edited by Unbiasedsound; 05-28-2016, 08:09 AM.

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                              • Testing the first customers art panels. They sent the images, printed to 16 x 20. Mounted the images to the frames using 3m VHB 5952 foam tape. Used the Dayton Audio DAEX25VT-4 exciter ( helps that their showroom is down the road from my house), with a 199uf high pass capacitor as the customer was going to use these in a surround sound system with subwoofers. You really can't tell from this iphone recording, but they do sound pretty good.

                                https://www.youtube.com/watch?v=Qs9Bmri_mqQ

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