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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: How about a nope, nope, nope.. posted by Jon Risch on April 21, 2004 at 22:28:53:
JR: For the caps,. you might try a web search for either stacked foil electrolytics, or the slit foil types, also very wide bandwidth.I was hoping to keep the size of the enclosure down, I have a 1 unit rack box I was hoping to put the entire welder in. That was why I was using 18 hex 4 die in to-220 packages, as duty cycle is very low. And, to get the 500 amp 100 mSec, I need 25 farads at 5 volts. So, the supercaps are in essence, the only way I know to pull it off. If I spread the current over say 10 2.5 farad units, then they each run 50 amp pulses..at least the lead of the cap won't fry.
The Nordmark paper is:
Binaural time discrimination
Jan. O. Nordmark
J. Acoust. Soc. A., Vol 60, No. 4, October 1976
Pgs 870-879
JR: BTW, the "dirt simple" I referred to was the first order aspects, of course, the secondary aspects at the least need to be considered, as well as possibly the tertiary ones.I consider "dirt LCR" to be what I can imagine and measure. To me, the inductance of a wire changes from DC to 1 Mhz, so I consider that the dirt..Semantics, of course, as normally everybody uses the DC number. However, if the Nordmark result stands, speaker wires cannot legitimately be measured only up to 20 Khz, but must be extended up to half a meg at least..
JR: For instance, skin effect is not a primary LCR parameter, is it.
See above..I consider it as something that affects L and R..nuttin to argue over, though.
JR: Loop coupling is not a primary self L per foot parameter, it is what I would call at least a secondary aspect.
I don't consider loop coupling, or more aptly named flux coupling, as a wire parameter. It takes two wires to do so, and as such, has geometry issues. However, the broadcasting of power, as that equation shows, is single wire, current, length and wavelength dependent, and must be considered for layouts when 500 Khz response is at issue.
JR:When the HISTORY of cable naysaying has traditionally been "only LCR per foot matters", then looking at ALL the LCR and physics related issues, including secondary and tertiary ones such as DA, tribo, piezo, motor/generator, etc., are just a more complete way of looking at it from a physics standpoint.
History of cable WHAT??aying??
I see fault everywhere in this respect. Some think their education and experience covers all aspects of this topic, and some apply incorrect diversions to the actual physics of the problem.
I see "high end audio" people constantly fighting to prove that magic is responsible for what they have perceived as cable differences, using contrived or ridiculous physics concepts to explain what they perceive. Those concepts are trashed, and rightly so, by the educated ones you refer to as on the other side of the fence.
The way I see it...long ago, this 1.5 microsecond lateralization ability should have been further persued by the high end community. As, based on Nordmark's 1976 paper, all this stuff is happening at bandwidths one and a half orders of magnitude above any possible human hearing capability. I fault you, and all the other "cables make a difference" types, for not following up on this lateralization phenomena..(Of course, it would have helped had anyone even known about the study, it seems to have been buried with time, only to be brought out by that earthworks paper.)
I also find fault with those who reject based solely on 20Khz bandwidth. Simple theoretical constructs show that right-left lateralizations of 1 foot, ten feet away, means 22 microsecond discrimination is a definite (close one's eyes, and point to a sound source ten feet away, near center of field...if you get within a foot of the real position, you have demonstrated 20 microsecond lateralization capability) Of course, in doing so, you have just shown an apparent 50 Khz bandwidth capability.I hope that my contribution to this whole ball of wax is enlightenment as to the validity of the other side of the fence.
And, as always, I will still apply only known science.
JR: Still a bummer about the Moose Tracks though.
Yah, tell me about it.. I'll know in about 6 weeks if I can go back..may need lipitor, though. I now reside about a block away from a known source of moosetracks, oh the inhumanity of it all...
Just had an echo-cardiogram..boy, they've really taken that tech forward. Up to 12Mhz phased array transducers now, with lots of neat software for measuring and visualization.
Cheers, John
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Follow Ups
- Re: How about a nope, nope, nope.. - jneutron 06:59:37 04/22/04 (0)
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