John Dunlavy On "Cable Nonsense"


Food for thought...

http://www.verber.com/mark/cables.html
plasmatronic
I read alot of 'em, but does anybody wonder "why things sound the way they do?" So you hear differences, but why doesn't anybody explain why it sounds different instead of just arguing whether or not it can be heard. I mean, ya, you put on some cable with a really high capacitance and you get some ringing or overshoot in the high frequencies because your amplifier may not be as great as you thought based on how much you paid for it. But X person thinks "this cable has more detail, must be the silver." Or with some little tube amp that doesn't have much top-end to start with, one finally gets a cable with a lower inductance and you get your high-frequencies back, "must be that solid copper with an optimized crystal structure so those electrons don't have to hop through the micro-diodes." My limited knowledge on the subject is, there can be audible differences between two cables on X amplifier, but they don't sound different for the reason cable manufacturers want you to believe, micro diodes, intercrystal rectification, skin-effect, etc., they sound different because the electronics at hand are sensitive to the basic cable load. Good/better electronics are less likely to be affected by different cables. Now of course this takes us into the whole vacuum tube arena, because alot of people are set on there valves. Honestly, if someone knows of a truly great, moderatly priced cable, tell me and I'd like to hear it. I'm using 4PR and up against analysis plus oval 9, no audible difference, and the designers of my electronics said I shouldn't hear one because the electronics are "not load sensitive" (for all practical, audible purposes).
Sorry Ezmeralda, I cant buy into that one. Cables like MIT, Magnan& Siltech, of course, do create R, L, and C,changes with different amplifiers, but the character or "personality" per se, of the IC, shines thru most every time. Gold and silver plating yields large differences in sound. Dont take my word on it, contact Doug Sax who will tell you that gold plating in his switch contacts ruined the sound and he needed pure silver to get the desired effect. No R,L,C changes there, just plating! Please explain why? Anybody............Frank
While i HATE to join back into this thread, i have been reading how some components are FAR more susceptible to cable changes than others due to design and overall circuit stability. I wish i knew how to test them to find this out. Maybe i should contact Frank Van Alstine and he can fill me in....

As to Ezmerelda's comments about the Kimber 4PR and Analysis Plus Oval 9's, i can draw some parallels between the sound of the two. I could see how one might not notice much of a difference between the two of them in some systems. Quite honestly, based on the experiences that i've had with those two specific cables, i too would choose the MUCH cheaper Kimber 4PR. Sean
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Firstly, Frap, I don't know what you mean by "cables like MIT,etc." creating LCR changes--all cables create LCR changes to my knowledge, or I should say frequency shifts due to them. Secondly, in the last sentence, plating does subtly affect the LCR values. Thirdly, what I'm saying is alot cheaper than the high-end cables, in fact it will save you alot of money. Most of Dunlavy's points seem right (I say seem because I'm not qualified to evaluate it entirely). I still have reservations as to why he has to charge $1,000 for a 10ft pr of his new "LCR cable", but maybe I'm naive to production costs.

Regardless of the usually subtle effects LCR values have on the linearity of the signal with good electronics, cable money is still better spent on better electronics IMHO, unless you've got money to burn (note, not necessarily more expensive electronics either). And I find it curious that cable manufacturers have to resort to what I perceive as such devious marketing schemes: square wave graphs without amplitude and/or frequency being specified, our cable versus a generic "leading large round conductor", their speaker cables' specifications (when they actually get published!!) compared to a 24-28g speaker cable (as if anybody uses that--unless you happen to buy into the images and ideologies of the 47 labs sakura systems S$%^), cite *Hypothesis* to market a cable (the microdiodes and various crystal structures like), etc. and do nothing to take it to that next step and translate the physical or electrical characteristics of their cable (if the latter even gets shown) into scientifically audible terms (because to do so would probably show the cable isn't that signficant). As Dunlavy pointed out in other articles sometimes these facets/claims of cable design result in changes of .005db, hardly audible. Inductance is unlikely to cause shifts of 1/10 db (although it can be as high as a couple db, audible) and resistance unlikely 1/20 db (to my knowledge). Which brings me to another point. If all these other, what I consider, less significant/"high-end" aspects of cable design are so audible, conductor material, skin effect (significant with RF), plating materials, etc. that people can hear significant differences in them outside lcr values, how come no one has managed to find a way to measure the distortion they impart on a signal after 30 years? And this is now why we have solid-gold interconnects sold on the basis of "the detail of silver and the bass and authority of copper"--B.S. This is why we have science: to settle the battlefield of opinions with facts--and I don't see any for the other side (nor do I hear things that lack explanation), yet.

As far as the plating in the selector switch making a difference, firstly, I won't deny your/his experience, there may have been an audible difference. However, secondly, I don't know the circumstances surrounding the situation which would take into account all variables. Since selector switches are physical devices with friction, there may be something else going on, I don't know. As far as the pure silver being needed to get the "desired effect." I take it the "desired effect" is not a coloration sought(distortion) as it is a more accurate signal transfer and that the gold was distorting the signal in some way.

Sugarbie, as far as your tenors and vocal chords analagy, the shape of the singer's mouth/vocal cavity, and other factors affect the *timbre* of their voices which allows you to distinguish among them, even though they may all still be singing the same note-frequency/pitch. Incomparable analogies do not discredit Dunlavy.

Why does everyone quote the age old "if they measure the same they must be the same" All the scientific community asks is "if they measure the same but sound different why can't you find a measurement to explain the difference."

I forget who made this point early on, but it is a good point that MR. dunlavy only showed the placebo affect and not that people can't hear differences, only they think they hear differences. Good Point.
Nelson Pass measured, charted, documented and published measurable differences in speaker cables 20+ years ago. He even notes that some specific speaker cable / speaker combinations caused some "well respected" brand name amps to shut down / go into thermal overload. The same speakers and amps with different cables DID NOT act up. Obviously, the amplifier is seeing a COMPLETELY different Z ( impedance ) at it's output terminals and is simply responding accordingly. Obviously, the only variable would have been the speaker cables !!!

Besides Nelson Pass, Moncrieff of International Audio Review measured, charted and documented differences in speaker cables. He even went so far as to publish frequency response charts for many that he tested.

Due to the differences in physical layout, gauge of conductors and dielectrics used, the characteristic impedance of the cable, the total length of the cables in use, etc... the amplifier can see VERY different conditions at its' output terminals. Some cables will act as "impedance transformers" and make suitable speaker loads "unsuitable" and vice-versa. Simply altering the length of an "unsuitable" cable CAN change the feedpoint impedance that the amp sees when trying to "load up" AND alter the amount of reflected EMF that the amp has to deal with. Since Mr Dunlavy is WELL versed in RF transmission line theory, this should not be news to him.

Since this IS the case and it has been documented time and time again, you would think that he might acknowledge that the stability of the amp MIGHT come into question BEFORE making "generic" and rather BOLD statements about speaker cables being "relatively un-discernable" from each other. After all, it is well known that amps change output levels when the impedance is altered. Why couldn't their frequency response or transient characteristics be affected also ???? Those specs ARE load dependent also.

PLEASE don't get me wrong. I am not defending "the wire bandits". I think that the mass majority of this stuff is WAY overpriced. While i can understand that there is a LOT of research involved in making any REAL product, the actual costs involved in most of these "wires & cables" is phenomenally low. As such, i have bought MANY different "manufactured" cables but have also made more than a few of my own ( with pretty excellent results overall ). Like i said, i just don't like the fact that Dunlavy talks out of both sides of his mouth with a different message being heard as the situation changes. Sean
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