yes -- a number of photos here: https://www.walterkircher.com/2013_08_jmc_soundboard_le_brassus_switzerland
and the patent document:
https://patentimages.storage.googleapis.com/be/9f/cd/25ab871977afd7/CH698823B1.pdf
Jarrodhaas,
Thanks for the links. Those both provide some information I had not seen before. As they usually are, the patent is difficult do decipher, and it probably doesn't help that the version I can read is a translation. But I'm working my way through it...
Eric
Thanks for the links. Those both provide some information I had not seen before. As they usually are, the patent is difficult do decipher, and it probably doesn't help that the version I can read is a translation. But I'm working my way through it...
Eric
If you have a spare conventional speaker around, it may be worth dissecting and then mounting/bonding the voice coil directly to the panel. Granted, it’s not an easy thing always to get the coil located concentrically, aligned normal to the magnet, and axially, but the results can be quite good.
I would think that a lacquer finish on certain wood to produce the best results, would also be interesting to experiment with selectively sanding certain portions of the panel to vary the thickness.
I would think that a lacquer finish on certain wood to produce the best results, would also be interesting to experiment with selectively sanding certain portions of the panel to vary the thickness.
Someone tried DML exciters on a guitar and double bass but not so good for vocals;
DIY Flat Panel Speaker Love -
Techtalk Speaker Building, Audio, Video Discussion Forum
DIY Flat Panel Speaker Love -
Techtalk Speaker Building, Audio, Video Discussion Forum
I have not seen this interesting DML implementation on this thread yet - combining a DML panel with a back loaded horn:
Another DML (distributed mode loudspeaker) / NXT project by inception. - YouTube
Another DML (distributed mode loudspeaker) / NXT project by inception. - YouTube
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Thanks, I missed that! If exciters were easy to attach and remove it would be fun to have my guitars playing on their stands when I have company.
This is an interesting thread. I am thinking of DML panels on the wall behind my computer desk to save desk clutter and improve sound.
Thanks, I missed that! If exciters were easy to attach and remove it would be fun to have my guitars playing on their stands when I have company.
This is an interesting thread. I am thinking of DML panels on the wall behind my computer desk to save desk clutter and improve sound.
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Here's a write up on work on flat panel speakers by a University of Rochester professor Mark Bocko.
Also, if anyone has this TV, you have the flat panel speakers at home. Video
And, another.
And, another.
Also, if anyone has this TV, you have the flat panel speakers at home. Video
And, another.
And, another.
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An interesting paper that was just published.
(a) Drawing of the adaptable prototype, which allows for an individual... | Download Scientific Diagram
(a) Drawing of the adaptable prototype, which allows for an individual... | Download Scientific Diagram
Would you care to try listening to the DMLs on off axis at your normal listening place? Place the DMLs up-firing and listen at the ear level? Interesting to know how your subjective feeling.
The idea in this paper is more like using the guitar as the DML, with one panel to carry the exciter, and the 'box' to do the 'Air Spring Effect.' In this paper, the authors had taken a lot of trouble to not to mention the material of that 'panel,' any of the other parts of the system. In a way, everyone, who writes papers or patents make sure to withhold that info.
That box of his (and his partners) is a resonance enclosure. It cannot be said it is a flat panel speaker, but a flat box. So, if you keep the inside of that box stuffed, or the back panel lined with absorbent material, there'd be more bass. You can do that with a guitar, if you have one around.
intaud,
Thanks for the link. Interesting paper.
I'm a bit surprised that the "Air Spring" effect is so significant. I wonder if their approach is as valuable it the starting point is better. That is, they chose a "worst case" base case with the exciter in the center and with no attempt at damping. If they started with an uncentered exciter and a damped perimeter, would there be any significant benefit from the special enclosure?
Eric
Great points Eric! Doing what you said along with adding a relatively inexpensive MiniDSP for EQ you can probably end up with a better response and avoid the complex enclosure. I also think there is benefit to DML's dipole effect with an open back.
Dave
Dave
Me too. If nothing else, it's cool. People don't expect to hear anything from the back, and it surprises them when they do.
Just today I was thinking I might hang a pair the middle of my basement workshop. it's a long narrow room, so I can put them in the middle and have nice stereo when I'm on either side.
Eric
Hang them parallel to the long walls. They will disrupt you less while walking up and down the room, and still give you "nice stereo" either end. The magic of DML's.
Hi, does anyone know where I can get replacement adhesive to stick onto the exciters? I don't want to use an epoxy or anything permanent, as I'm testing different positions.
The exciters that I have are Dayton Audio DAEX25FHE-4.
I have been meaning to get round to building some carbon fibre honeycomb panels, but haven't got round to it. Now that I will be off for Christmas, I'll get round to it.
I was in a shop the other day and happened to see some blank canvas, so purchased one to test. I was impressed with the results on the low end. I attached a 1mm thick carbon fibre plate to the back of the canvas using double sided gorilla tape and used one Dayton Audio DAEX25FHE-4. When I pushed against the canvas, make the canvas more taught it improved the bass by a big margin. Then I wedged some wood behind the panel, which improved the bass, but also ripped the canvas. I will get another canvas and make up a small frame to go inside, so that I can tension the canvas without ripping and post results.
I would like to add another exciter to the carbon fibre plate, but can't as don't have anything to stick it with that's not permanent. Will also try 4 to see how it sounds. I placed an additional exciter by hand and the midrange came out much clearer, so will experiment.
Once my microphone comes through, and I get a new canvas, I'll take some readings.
Thanks
The exciters that I have are Dayton Audio DAEX25FHE-4.
I have been meaning to get round to building some carbon fibre honeycomb panels, but haven't got round to it. Now that I will be off for Christmas, I'll get round to it.
I was in a shop the other day and happened to see some blank canvas, so purchased one to test. I was impressed with the results on the low end. I attached a 1mm thick carbon fibre plate to the back of the canvas using double sided gorilla tape and used one Dayton Audio DAEX25FHE-4. When I pushed against the canvas, make the canvas more taught it improved the bass by a big margin. Then I wedged some wood behind the panel, which improved the bass, but also ripped the canvas. I will get another canvas and make up a small frame to go inside, so that I can tension the canvas without ripping and post results.
I would like to add another exciter to the carbon fibre plate, but can't as don't have anything to stick it with that's not permanent. Will also try 4 to see how it sounds. I placed an additional exciter by hand and the midrange came out much clearer, so will experiment.
Once my microphone comes through, and I get a new canvas, I'll take some readings.
Thanks
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I you're going to replace the canvas anyway you could experiment with gesso or other coating as well.
I you're going to replace the canvas anyway you could experiment with gesso or other coating as well.