Actually it is pretty interesting if you read it and understand his conclusions.
A few things in it you may have mistaken for useable data:
1. The bad cables were small conductor size, 18G and 24G vs 12G for the better cables. Given enough length, there is measureable resistance in a small conductor cable. Higher resistance in a feed wire (if the wire is long enough) causes cable heating which means power is wasted getting to and coming back from the speaker, and the high resistance (relatively high - probably in the order of 1-2 Ohms in 25 feet of 24G wire) can cause loss of damping (not a lot - but some) - leading to "loose" sounding bass (less critical in heavily overdamped speaker designs such as ones with huge magnets like McIntosh used, or in sealed enclosures - which McIntosh also used.)
2. His initial test setup - of a high-impedence source, meaning - not an amplifier, probably a signal generator he noted has a 50 Ohm output (a common value), feeding a purely resistive load of 0.1 (1/10th) Ohm. If you are looking for high frequency rolloff - this is about as bad as you could make it. I once made the mistake of doing a frequency response test with a General Radio Frequency Tester (combined signal generator/plotter) - where the output of the GR signal generator was 50K Ohms, and the input of the Revox recorder I was testing was a 600 Ohm balanced input. Showed horrible high-frequency rolloff - way beyond the manufacturers spec of +/- 2dB at 20KHz. Once I realized the problem - and used a stepup transformer on the output of the GR frequency tester I got exactly the results the manufacturer gave as specifications. He then notes that he has seen cases where using a real amplifier - the poorer specification cable (higher resistance) gave better results since the reactive/inductive load doesn't effect the amplifier stability.
His final conclusions are valid - once he realized the error of his earlier measurements (the only reason I can see that he included them was he must have had so many column inches to fill..) - he created a load that he felt better replicated a loudspeaker load and found the differences in cables to be insignificant IF the cables are the same gauge. He finally stated:
from article said:
Frankly, I found it difficult to assess the results except at the extremes of performance. For 10 foot lengths with properly terminated cables and speakers with inductive high frequency characteristics, the differences between low inductance cable and twin conductor are extremely subtle and subject to question. With a low output inductance amplifier and a Heil tweeter (whose impedance is a nearly perfect 6ohm resistive) the difference was discernible as a slightly but not unpleasant softening of the highest frequencies. Fulton or Monster cables were a clear improvement over 24 or even 18 gauge, though a little less subtle than I would have expected, leading me to believe that the effort associated with heavier cables pays off in bass response and in apparent midrange definition, especially at crossover frequencies. The worst case load, the modified Dayton Wright electrostatics, presented some interesting paradoxes: the extremely low impedance involved showed the greatest differences between all the types of cables. However, the best sound cables were not necessarily electrically the best because several amplifiers preferred the highest resistance cable. In one case, I had to use 24 gauge cable to prevent tripping the amplifier's protection circuitry.
What he said (and I completely agree) was:
- Given cables of the same gauge - it's not possible to discern a real difference.
- Poor or dirty connectors can have a noticeable effect
It doesn't say that any of the cables tested had any magic in them..
His scope photos are interesting if you discount the ones with no termination (which are really useless) and you analyze the one with a capacitive termination (which is not a loudspeaker type load).. You'd have a hard time discerning from the remaining photos if the Polk cable or the 18G zip-cord was better - and in the square wave trace - the zip cord IS clearly better (the 5uS pulse into 8 Ohms.) I suppose the traces into a capacitive load are supposed to represent a theoretical electrostatic speaker (but if your electrostatic speaker has a crossover or step-up transformer, which Martin Logans DO have) - it's no longer a capacitive load, it's an inductive load at that point, and the resistive measurements apply.
His conclusion on wire size agrees entirely with mine:
Polk said:
Who am I to dispute the feelings of audiophiles who, evaluating any cable in the context of program source, amplifier, speaker, and listening room, decide they can hear the difference? A few guidelines have emerged here, but the final judgment belongs to the user. All the special cables mentioned worked well on the test bench and, given the assumption that series impedance should be minimized, all of them work better than 16 gauge wire. If, like many audiophiles, you have spent a small (or large) fortune on your hi-fi system, money spent for high quality cables and connectors is a reasonable investment.
And he's absolutely correct - the bigger conductors (over a long enough length) will work better then smaller conductors... The cables Roger Russell suggests are the ones I'm using (in 5' lengths, where i could probably get away with 24G Radio-Shack "Speaker Wire") are 12G - large insulators, meant for underground use (outdoor low voltage wiring).. with ample sized terminations swaged onto them by me (I have professional crimp tools - just for stuff like this. And if I was in doubt of my crimping skills, I have been soldering things for over 55 years now, and think I've gotten reasonably proficient at it..) This cable cost me $0.28/foot.. available at most home centers.
As I said before - good'on'ya if you want to spend your money that way, I have no problem with it, but I'm spending mine on new music to listen to... for me - that's better bang for my buck. :rocker: