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  • More DML love

    I am building a set of 4 to hang from my kitchen ceiling. Using 2x2 XPS (I think?) combined with 1/8x8" round wood panels driven by DAEX25-SHFs and EQ'd with a DSP-408. Not sure about the amp/preamp yet as my old Cambridge Audio preamp seems to have bit the dust.

    Haven't figured out how to use REW yet so I just tuned the DSP-408 with a calibrated mic. The stock sound was very "nasal" with not much top end.... very strong from maybe 2K-8K with big rolloff from there. I got the sweep to be mostly flat, then made some more changes to taste (it was still a little too sibilant) using the harsher reference tracks I had (most of the tracks from Steely Dan's "Gaucho"). Overall I am pleased with the sound, though one thing that was a bit disorienting was the complete lack of a soundstage. The room is just filled with sound, with pretty vague channel separation. Given that these are gonna be on the ceiling I figure that is fine. They sound great otherwise.

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    • Originally posted by SAC View Post
      More DML love

      I am building a set of 4 to hang from my kitchen ceiling. Using 2x2 XPS (I think?) combined with 1/8x8" round wood panels driven by DAEX25-SHFs and EQ'd with a DSP-408. Not sure about the amp/preamp yet as my old Cambridge Audio preamp seems to have bit the dust.

      Haven't figured out how to use REW yet so I just tuned the DSP-408 with a calibrated mic. The stock sound was very "nasal" with not much top end.... very strong from maybe 2K-8K with big rolloff from there. I got the sweep to be mostly flat, then made some more changes to taste (it was still a little too sibilant) using the harsher reference tracks I had (most of the tracks from Steely Dan's "Gaucho"). Overall I am pleased with the sound, though one thing that was a bit disorienting was the complete lack of a soundstage. The room is just filled with sound, with pretty vague channel separation. Given that these are gonna be on the ceiling I figure that is fine. They sound great otherwise.
      Damping is a DML panels best friend. You can use Frost king weather strip foam tape on all 4 sides of the panel. If you look at this video you will see the white foam all around the DML panel.

      Bertagni Electroacoustic SM 80 Flat Panel Speakers - YouTube

      Comment


      • Originally posted by Unbiasedsound View Post

        Damping is a DML panels best friend. You can use Frost king weather strip foam tape on all 4 sides of the panel. If you look at this video you will see the white foam all around the DML panel.

        Bertagni Electroacoustic SM 80 Flat Panel Speakers - YouTube
        I am running these without a frame and hanging them from the ceiling.... does that make a difference? Will be hard to make a frame with the rounded corners

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        • You dont need to use a frame, that vid was just to show you where to put the foam. Just use the FK damping foam all around the sides. This will prevent the vibrational waves from escaping from the sides of the panel and making your panel sound fuller and more focused instead of diffused. This will also create better stereo separation, due to the vibration not coming out of the sides and cancelling the other panel out.

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          • Has anyone painted there XPS project panels with Plasti Dip spray paint? ( https://plastidip.com ). If so did it effect the sound quality?

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            • Originally posted by pixelphoto View Post
              Has anyone painted there XPS project panels with Plasti Dip spray paint? ( https://plastidip.com ). If so did it effect the sound quality?
              No but from what I read from the site its like rubber and remains flexible and stretchy over time and it can be peelable and removeable from most surfaces. Like paint this can be used as a skin to help tame some high frequencies but like paint if to much is used it can hamper high frequencies. If used lightly it should work but if too thick it will over damp panels.

              One thing not really discussed with DML is the skin. Anything thin, light and even slightly porous can be used as skin. Anything you put on the panels even a light coat of paint will change the sound. T.I. in his comment section claims that light paint wont effect and or change the sound. He is wrong. Paint one panel and not the other and do some critical listening and you will hear a slight difference. Some want to put posters on the panel for decoration but it will change the sound. Again I repeat anything you put on the panels will change the sound as these panels are sensitive to changes. You can even combine materials to be used as the skin, for example my go to material which is the most common one is paint but I also combine that with speaker (grill) CLOTH. I have owned speakers since the 70's and my ears like the sound of the speaker cloth. Speaker cloth can tame some of the harshness making the panels sound smoother. You can wrap them directly on to the panel or away from the panel like a conventional cloth grill. Damn I am giving away to much of my secrets I better shut up. LMAO

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              • it's probably been addressed somewhere in the 88 pages that I didn't read, but have folks experimented with DSP to flatten out the frequency responses for these? I use a set of the cheap buyout exciters from about 12-13 years ago on the backside of my shower enclosure. I love the setup, but the response certainly is far from flat. I've often though of measuring it and using a Mini-DSP or similar device to try and correct some of it.

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                • LOUT
                  LOUT commented
                  Editing a comment
                  I've heard folks claiming DSP works well for them and I always kind of thought that was standard operating procedure. I'm assuming passive parts could be used for the same thing if you prefer, but in general I'd assume it's very similar to using any other FullRange driver in that regard.

                • Unbiasedsound
                  Unbiasedsound commented
                  Editing a comment
                  DSP/EQ is not really standard operating procedures in DML. It wont turn a awful sounding DML panel into a really good sounding DML panel. A DML panel is based on one's design as the better your design the better the DML panel will sound. DSP/EQ should mainly be used to fine tune a already good sounding panel.

              • DSP/EQ can help to flatten out the frequency response and make them sound a bit better but there are limits to DSP/EQ.

                Comment


                • Originally posted by Unbiasedsound View Post
                  DSP/EQ can help to flatten out the frequency response and make them sound a bit better but there are limits to DSP/EQ.
                  for sure, but I don't do my critical listening in the shower, so if it can help even out the response a bit, I think it'll be an overall win.

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