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#21 |
diyAudio Member
Join Date: Jun 2005
Location: Taiwan
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That will be interesting to try. But I'm worrying the coupling between exciter and the bridge is difficult. It's too thin.
I've tried holding an exciter (by hand) and let it drive a foamcore board at its side. There's some sound, but horribly squeaky. |
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#22 |
Got Foam?
diyAudio Member
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Perhaps it may be enough to attach the excited to the central portion of the back panel of the violin or cello. Easy to try.
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#23 |
diyAudio Member
Join Date: Jun 2005
Location: Taiwan
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Yes, that'd be much easier. I guess the location of sound post would be the 'sweet spot'
![]() It's very near the HF side of the bridge, must be a good choice to excite. |
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#24 | |
diyAudio Member
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Quote:
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#25 |
diyAudio Member
Join Date: May 2004
Location: Los Angeles, California
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It would be ideal to have some sort of laser interferometry set up to really develop this sort of driver. That should be the next thing installed in your lab xrk, and CLS too...
![]() However, I have a low tech solution: get out the glitter and a signal generator.... It will readily detect chladni patterns. In theory, the goal should be an expanding wave with an origin at the motor that matches the expansion of a spherical wave formed in the air. Essentially, you want a mechanical Quad ESL. Assuming a large flat panel forming a hemispherical radiation, the sound should travel through the panel at the same speed as the air at 'normal' temp and pressure. The wave speed should constant at all frequencies -- which as a requirement is a doozy. Needless to say, virtually any bell resonances are going to be distortion. In practice, I'm not sure it's possible to avoid them. Possibly the worst allegedly hifi speaker I've ever heard was a flat panel driver with a foam core diaphragm, but it would be interesting to see if this sort of thing could be done well. Sounds like CLS has been experimenting for a while, and has gotten some results. |
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#26 | |
R.I.P.
Join Date: Nov 2003
Location: Brighton UK
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Quote:
Hi, In practise distributed mode loudspeakers don't work like that at all. The operation is entirely different, and your missing the point entirely. rgds, sreten. |
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#27 |
diyAudio Member
Join Date: Sep 2010
Location: Amsterdam
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You could lay the panel flat, put Some sugar on it and look at the Patterns when you play sines at different frequenties. This way you can see were the effectieve placets are to place the blobs for certain frequenties.
Fun! |
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#28 | |
Got Foam?
diyAudio Member
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Quote:
![]() ![]() You don't want to lay it directly on floor either - suspended at edges with frame or strings. |
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#29 |
diyAudio Member
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#30 | |
diyAudio Member
Join Date: Jun 2005
Location: Taiwan
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Quote:
Not many commercial products out there. Here are some of them: Podium Teragaki-Labo?????????????????TERRA??????????? Ciresa Opere Sonore : enceintes plates en bois d'instruments http://www.commbax.com/products/mini...es/minipro.pdf Professional Distributed Mode Loudspeakers | I guess it's because of the special acoustic features, it's gradually showing up in pro audio. There must be some pro audio shows where you can see and hear them. |
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