QUOTE(ccschua @ Jul 26 2008, 12:41 PM)
These are the power cord I ordered Volex 17604 --
First, I'll state that I do not consider these industrial, mass produced, low margin 14gaX3 shielded powercords to be an 'upgrade', but rather, they are the minimally acceptable powercords for audio use (which is why I'm posting this in the General Asylum). For whatever reasons, vendors generally provide generic 18 or 16ga PCs, and I've never encountered a situation where the Volex 17604 or 17605 (2 and 3 meters) have not produced a major improvement in all areas, soundstaging, resolution, dynamics, extension, emotion.....Simply put, everything is 'mo betta'.
These powercords are ideal for anyone who wants to judge whether powercords actually make a difference or for judging what value a more 'bespoke' and expensive cord is providing.
Comparisons - In comparison to the 'Asylum' cord, the latter provides higher resolution, which may be attributable to the removal of the plummyness imparted to the bass (in comparison to most OEM cords, the Volex bass is tighter and more resolving). But realize that a premade 'Asylum' cord will cost about 10x as much, or if you DIY, each major component, the cable, plug, IEC, will cost as much as a complete Volex cord. My own DIY starquad powercords (IMO) and many other aftermarket cords are substantially better, but whaddaya expect for <$1/ft for the whole dang cord?
If you're unsure as to whether powercords make a difference, want maximum bang for the buck, or want a cheap baseline for evaluating audio specific cords, do yourself a favor and buy the Volexs. Many electronic distributors cary them - Allied, Newark, etc...
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However, I am disappointed it is not Belden cable as used in the Asymlum power cord. As to how much improvement, I think it does not sound clear to me, but I will just leave this power cord to the ZERO DAC. For less than RM 50, I think it barely meets value for money. Alternative is to replace the stock plug and connector.
On this topic i actually have a sound ideal here.
Worse is Better lol. Believe it or not. Now ye shall receive one of my patented dumb lectures.
Taking into assumption that you don't need a shield and have little or no radiated EMI or RFI. Being the inventive student i was, generally bored, and the kind that likes to push buttons for no apparent reason, i did some research using a time domain reflectometer and agilent power meter using 50 ohm matched souce/load combo, signal came from a really expensive Rohde and Schwartz i would love to steal.
I can't do anymore request tests as the lec that let me do this, Mr Varnes took a 1 sem holiday, that old coot. Nonetheless the results from this one are interesting.
We consider 2 cables, 1 a standard RG58 and another is a Thin Lan Silver plated Cable made by Huber Suhner
Results = Nothing out of the ordinary, the Suhner cable beat the shit out of the nameless RG58, by a good 30-40 percent marging in attenuation up till 500Mhz and after that it went up to 100 percent.
But it did get me thinking. Attenuation at specific bandwidths might be useful, it's a just a bad thing made good by using it in a place where it can help. Attenuation at 60Hz was obviously so small it didn't matter, generally only after jumping to 1Mhz did i see the difference between cables. But what about the rest of the range? All those megahertz must mean something right?
Haha, that's where it all came in.
What do we want from a good power cable?
1) For it to deliver power at a given frequency with the lowest attenuation.
At 60Hz, this doesn't matter, both mathematically and practical test wise, as long as you have a cable that can carry the current, it should never matter)
2) For it NOT to deliver any power at any frequency aside from from the fundemental.
You see, as the frequency rises, the crap cable generally puts up more of a fight to the signal than a good one. This is bad in RF applications, but when all you want is 60Hz, then the reduction of all the junk high frequency signals that travel along the cable is awesome. Awesome Possum.
A good cable generally tries to model a pefect transmission line as closely as possible, a bad cable doesn't. A bad cable has higher levels of resistance, capacitance and inductance, although unwanted in the signal domain, in the power delivery domain, it acts as a low pass filter that filters out crap before it reaches your PSU.
Conslusion/TL/DR : Cheap and crappy cable is potentially far better than expensive cable. As long as your cable is shielded, a crappy cable should always beat a good one when used as a power cable. Yay.
Someone blanja me when i come back in December ya?