John Curl's Blowtorch preamplifier part II - Page 2834 - diyAudio
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Old 22nd October 2012, 04:52 PM   #28331
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Interesting idea as the metallic phasing plug provide naturally a near perfect electrode.
The equal repartition of the moving forces on all the membrane surface allow-it to be less rigid, = lighter than when a coil at its edge. Lighter means upper frequencies capabilities.
But as it is described, the membrane look like very thin, so he uses some kind of spacer's suspension in the middle of it ? So we are again with the fractionating problems ?
Did a prototype have been constructed, how it measure and what is the efficiency ?
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Old 22nd October 2012, 05:14 PM   #28332
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Can-we imagine a foam with open cells applied over the entire membrane surface, with linear restoring forces, which would also make the compression adiabatic?
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Old 22nd October 2012, 06:38 PM   #28333
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You are quite right in both of your posts.
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Old 22nd October 2012, 06:41 PM   #28334
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Old 22nd October 2012, 06:50 PM   #28335
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Old 22nd October 2012, 08:17 PM   #28336
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What?
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Old 22nd October 2012, 08:50 PM   #28337
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What?
High tech device designed by carpenters, as usual.

Look at the edges around the tweeter. When this pyramid is closed by a grill they are anyway invisible.

Also carpenters design crossovers. However, their speakers require very expensive high end amps that don't engage overcurrent protection hitting impedance dips. And of course, speakers for very expensive amps have to be very expensive.
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Old 22nd October 2012, 08:56 PM   #28338
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Those edges are either foam or felt.

Roar
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Old 22nd October 2012, 08:59 PM   #28339
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Also carpenters design crossovers. However, their speakers require very expensive high end amps that don't engage overcurrent protection hitting impedance dips. And of course, speakers for very expensive amps have to be very expensive.
Yeah, I have to wonder: was that _really_ the only way to design that crossover? The mind boggles.

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Old 22nd October 2012, 09:41 PM   #28340
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And of course, speakers for very expensive amps have to be very expensive.
Can't you imagine how difficult (means expensive) it must be to make a smooth recovery between transducers of such different diameters, means so different directivity curves at the crossover frequency ?
How difficult it would be to find a medium of such a diameter that fractionate in folds of a "haute couture"s elegance, to go up to the highest frequencies... (High frequencies are expensive)
At the end, the most difficult will be to find CDs or Vinyls expensive enough to feat all those expensive high end, magical, legendary, state of the art...rare products, designed by the elite for the elite.
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