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In Reply to: RE: What is the evidence... posted by Lew on June 26, 2015 at 15:36:39
straded wire has a sort of pervasive smear LItz or non litz. While I accept stranded as a necessity for ease of installation and flexibility, I try to select as few strands as I can per insulated bundle.
I distinctly remember the old Levinson Speaker wire: etremely finely stranded OHFC copper in a Monster configuration with a 1/4 inch spacer down the middle.
Was OK better than the Monster but in hindsight there was a curious dichotomy betwee the highs and lows. Large total gauge gave bass, the fine strands the highs but there was a curious slight suck out in the mids. Experimented with welding cable too, similar results.
The problem with many cables is that the listener finds one design which complements his components. and then,even though another design may be superior, it may not sound so good within the context of what he has.
The issue of stranding came up in a serious evaluation of Tara labs solid core speaker wire designs. They have a curious purity in the midrange. Double up the wire and that purity disappears
The diode effect will occur even without obvious oxidation, as ultra pure copper (6N) will oxidize slightly immediately upon exposure to air. Litz was supposed to be the answer but then that introduces capacitance....
As an aside, some engineers are anxious to incorporate nanotubes in wire design. Because nanotubes are so tiny, physicists believe only an electron or two can travel through them. This makes even a bundle of aligned nanotubes sort of akin to a lser where the electrons will not be deflected of the realtively gigantic side walls of a wire. Trouble is making them long enough.
Graphene is supposed to be essentially a nanotube unrolled. It has almost zero resistance to electron flow, so interpolating that info leads me to believe nanotubes may make silver and copper superfluous once the production issues are addressed.
YMMV obviously and FWIW
Follow Ups:
FWIW, I favor solid core, too. But I use the thinnest gauge possible in a given application, because I also think I hear a benefit from very thin gauge. When current needs to be accommodated, I would use several parallel individually insulated strands of thin gauge solid core wire. Alternatively, thin ribbons sound good to me, as well. Litz is just a special case of this, where the winding of insulated strands results in added capacitance. I tend not to like Litz windings as much as just paralleling strands in space, but I cannot say why the latter sounds a bit less "dark" to me. I was withholding my own biases in order to ask my question of DG, regarding his bias for the opposite, without putting him on the spot.
Nanotubes, I don't know. Don't know any reason why transmitting a single electron at a time would be necessarily a good thing, but maybe some day we'll find out. I can predict, however, that the first wire-maker who can find a way to incorporate the word "nanotube" into his advertising blurbs is sure to do so.
Furutech is advertising nano technology in their cables I don't know how it is implemented though.
As one physicist explained to me, a bunch of nano tubes each passing only an electron or two will have the properties similar to a laser, Which I find interesting. Electron flow will basically be colliminated.
Mapleshade uses exceedingly fine wire for their IC's or at least used too. Yo cn barefly see them and they would house them in a silverplated copper tube for protection. They were finer that the wires used in a MC cartidge, soldering was impossible at least with standard irons as the wire would literally melt.
The wire, sonically, was very coherent (as most single solid core tyes tend to be), quite detailed but dynamically a bit stifled, at least IMHO. It was interesting and I experimented extensively using fine magnet wire, but abandoned the idea because of reliability concerns
Pierre Sprey and others associated with Mapleshade reside in my area. I have known Pierre for decades; he is the close friend of a friend. It was he who first suggested to me that very fine solid core wire was "the way to go" in chassis wiring and with ICs. My own "experiments" have led me to agree with him. I do recall the very fragile Mapleshade ICs that used tubing to protect the incredibly fine wire within. I think they used the 40-micron "6-9s" copper wire from Japan that can or could be purchased from M Percy. At some point, Mapleshade shifted emphasis to very thin copper ribbon, perhaps related to the fragility of the other wire.
Yeah, And I have a bridge I's like to sell you. Thin wire thin sound.
After years of evaluation, I find 24 AWG solid core OCC copper with foamed/cellular FEP Teflon dielectric to be an ideal conductor for both line-level and speaker-level applications, with the use of a multi-conductor litz wire bundle for speaker cabling in order to increase the aggregate/effective gauge of a multiple small-gauge conductor speaker cable design for more efficient current delivery, improved driver resonance damping, and effective noise rejection. To be fair, other than a Jantzen foil inductor, I have never evaluated Goertz-style foil conductors for cable applications, so I'll simply respect that type of conductor with the dignity it deserves.
text, 1953 on electro manetics, Haven't really gotten into to it, bt was surprised to see that parallel foil or ribbons actually form a waveguide and they give the formula for the frequencies involved.
Waveguides of various cross sections are likewise discussed including ovals and H shapes cross sections. For a 1953 book quite inereting although it will take me a while to digest it (Thank heavens most math is simple algebra)
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