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  • dawnut
    replied
    Originally posted by benjicon View Post

    Love this thread.. SOOO much to digest.

    Do you know if anyone has tried coating XPS panels in a thin layer of epoxy resin ? If I had to guess this might add a little more weight to the panel, but 'm curious if its a viable option. I am an artist and considering putting artwork directly on the XPS panel, if its been tried with no success I'll reconsider my options. If no ones tried I'll roll my sleeves up and have a go.
    An alternative could be a water based rattle can spray paint. I know Krylon makes a water based spray paint just for plastics that you could give a thin even base coat with. They also make a primer just for foam products. https://www.krylon.com/products/craft-foam-primer/ That might be a viable alternative to the glue/water mix.. they also make a spray gesso https://www.krylon.com/products/gesso-spray/ . One of the nice things about working with the XPS panels are that they are inexpensive enough to experiment with. Grab a 4'x8' piece cut up some panels and go for it. I used regular spray paint on one of my experiments but you must keep the can a good ways away from the panel and use very light coats or the solvents will eat into the XPS.

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  • Unbiasedsound
    replied
    Coating the whole panel of XPS will not only add some weight to it but dampen the panel reducing volume out put and sound quality....unless you can dilute the epoxy to where its similar to the 50/50 water glue mixture....That would probably require some type of thinner like acetone or laquer but those type of solvents do not do well on polystyrene due to there corrosive properties.

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  • benjicon
    replied
    Originally posted by Unbiasedsound View Post

    "You would still need to do the basics like sanding panel and treating the panel with 50/50-70/30 water glue ratio and rounding the corners painting the front side etc. you can read up on that on this topic."
    Love this thread.. SOOO much to digest.

    Do you know if anyone has tried coating XPS panels in a thin layer of epoxy resin ? If I had to guess this might add a little more weight to the panel, but 'm curious if its a viable option. I am an artist and considering putting artwork directly on the XPS panel, if its been tried with no success I'll reconsider my options. If no ones tried I'll roll my sleeves up and have a go.

    Leave a comment:


  • dawnut
    replied
    I'm a big fan of the DML, and have actually read through this whole thread. Being an old guitar player/builder I tried something a little different. Did a pair of dreadnought size acoustic guitars with the exciters mounted under the bridge area. I use these routed from my computer through a 6n3 YuanJing preamp and an older modified Lepai 2020A+ I'm using these in my 15'x20' sound room so volume doesn't have to go that loud.. Did my first listening session about a week ago with one mounted on a floor guitar stand and the other just propped against a chair. Amazing sound with details high and midrange that I have missed even with the PreSonus Eris E8 studio monitors I use with my DAW. Heavy bass at louder volume will get a little muddy and boomy so am working on a solution to that. with inline high pass and a small subwoofer. Still need to install my 1/4" strap peg jacks and hang them from the ceiling. I'm convinced these will be the speakers I'll be listening to just to relax by.

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  • Unbiasedsound
    replied
    It worked out pretty good...Still some kinks that need to adjust but all in all its to my preference.. After using 4 different conventional cone subwoofers I kept on going back to my DML sub.....A DML sub will not hit as hard, go as low or play as loud as a conventional cone subwoofer because of there limited pistonic movement....The reason why I prefer the DML sub is because IMO it blends the best with my DML panels keeping that DML signature sound....The DML sub IMO is also very articulate and detailed unlike some one note subs.

    My designs are basically a modified version of Bertagni loudspeakers....Standard Design foundation would require a frame that would hold the diaphragm material in place with a spline to hold the exciter magnet in place as one unit like a conventional speaker basket similar to a BMR driver.

    Material of choice is High density (EPS) Expanded Polystyrene. Preferred thickness 1/2-1/4 inch.....size ideal around 20-24inch X 16-18inch.

    Frost King rubber foam to attach diapharam material to frame.

    Driver recommended for sub application> https://www.parts-express.com/dayton...-4-oh--295-240 https://www.parts-express.com/dayton...4-ohm--295-238 If you need a 8ohm>https://www.parts-express.com/tecton...citer--297-206

    Any type of sub amp. One with a 30hz boost or eq is a good option to have as most exciters low frequencies start dropping at 100hz

    Tips> DML sub panel should be placed horizontally on the ground and inbetween the Left and right main/front channel speakers.

    Using some type of acoustic foam pads like Auralex isolation pads under the DML sub will tighten up and increase bass response.

    Using XRK's (DIYAUDIO forum) foam core enclosure on the DML sub will also increase bass.

    You would still need to do the basics like sanding panel and treating the panel with 50/50-70/30 water glue ratio and rounding the corners painting the front side etc. you can read up on that on this topic.

    Leave a comment:

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