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In Reply to: RE: nodes posted by Ugly on June 15, 2014 at 08:44:03
"repurposed unwanted mechanical energy."
Or, as they say in the profession: R.U.M.E. Colloquially 'rummy'. I'm not too sure just which profession that would be but I've worked on lots of rummy stuff in my time...
Your point is an excellent one, heat's the final repose for energy so we all need to do our bit to increase entropy!
Breaking up resonances seems like a good thing as it broadens the energy and reduces the radiation efficiency of the source. But does it also reduce the "impact" of the music? I don't know, audio systems are tricky...
Rick
Follow Ups:
Lol. Not bad as acronyms go.The trick is always protecting that stupid cat. Dead or alive though it's all a just another path on a downward spiral to heat death.
I think the best bet is ensuring there isn't a possibility of standing waves from forming in the enclosures in the first place and any enclosure resonance causes distortion since it's energy robbed from the acoustic signal. How can one possibly re-use this energy constructively once it has been converted from it's acoustic energy source?
Since no one can design perfect enclosures we will always have unwanted resonance.
Who knows? Maybe breaking up nodes and damping work well together. I'm no ME.
Edits: 06/18/14
"I think the best bet is ensuring there isn't a possibility of standing waves from forming in the enclosures in the first place"
Right! And that means improving the impedance match to the air or increasing the loss of the radiator. Or both. Ya' gotta keep the effective Q down...
I think Quad has or had some scheme using a delay line that mapped the size of the driven surface to the frequency components. That makes sense to me as it should make the radiation resistance more real and consistent. I wonder if you couldn't do the same sort of thing with dynamic drivers in an array on a panel. Sort of a sweet 128... We can make low power amplifiers really small and cheap and if the array was circular each Amp. could run several drivers at a given circumference.
And then, of course, we totally damp the back wave or put the whole Mary-ann in a wall so it feeds two rooms. Or use horns...
Meanwhile, I've found that the only speaker topology I really like long-term is sealed "acoustic-suspension" styles. They just sound truer to me in an actual room than other styles. I think that well implemented horns (Geddes?) might also work but I've not heard them.
And "in the room" is a huge factor. At one time I has big ESS speakers with a Heill (sp?) tweeter and TL woofers. We were moving around a bit then so I had them in three houses and they almost worked in all three, but not quite. I replaced them with Infinity quantum 3's and was very happy. BUT the interesting thing was that if I opened the sliding door and sat out on the patio the ESS's really sounded like there were live instruments playing in the house. The Infinity's sounded like a good stereo was playing on the house under the same condition. But sitting inside they flipped and sounded like you were more at the original venue and were far more enjoyable and less irritating.
Which is a long-winded way to say that you have to match your tastes AND environment. I suppose it's obvious but some of us are slow... By the way I happened to go to a show at the Griffith Observatory during all this and they were using small banks of ESS home speakers, the one's with a port, at each corner for sound. It sounded wonderful!
Rick
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