Well thank you. That was nice to see a response to my original post. I appreciate it, sincerely.
I was actually talking to Mikeaj though about a previous response I made to him about something different but nonetheless...
"Some USB cables are defective and non-standard compliant."
As has already been suggested to which I have replied, I really doubt it could be such a large quantity. Plus, I would be hard pressed to believe that the differences can be to such varying degrees. For instance, I could take a USB cable and plug it into my device from one source; it works. I could take it to another and it doesn't. The I could do the same test with another cable and it works in both places. You could make a point that falls in line with this notion of non-standard compliance and/or them being defective in some way. What I mentioned though is just one example and it gets even more jumbled with more sources, more cables, more devices - such tests.
Even if this were 100% the issue, it means that USB cables DO VARY, WHATEVER THAT REASON MAY BE. The question isn't whether correctly made/standard USB cables could make a difference over another correctly made/standard cable. The question is if any one USB cable THAT WORKS could make a difference? Even in the example I gave, it clearly means one cable is providing more power than the other. I don't know how to quantify that but here we are again at the start. Just saying...
"You need power hubs because the source may not be able to provide enough power. I can tell you that I tried all of my USB cables to try to power my USB 500G drive from my NAS and it did not work. Used a Hub with ANY USB cable and presto! You can get an active (powered) long USB cable from monoprice BTW. Thickness my solve the issue for long haul, but it may not be very practical."
It's not just dependent on the source past certain distances. For reasons I forget, it states on USB.org that due to the nature of the design of USB, there is power leakage that occurs. I don't know how or why scientifically but that's what was said. I had a really good article/page about many things where it was broken down but I found something kind of relevant which just would suggest the idea that there's more involved in the transmission of the signal than there would be say a power/audio cable. http://www.ehow.com/about_5365028_maximum-length-usb-cable.html
"The S/PDIF and USB interfaces usually are separate circuits and perform differently due to their different implementations... There are more differences than just power drawn."
Right, I understand that, but I meant like in terms of just the power which would be at the DAC stage. I meant that contrary to what was mentioned about the difference between e.g. and Optical connection and USB, I thought the DAC was powered the same - with the battery, since there is no power source when connected one way vs. the other. As I think I mentioned, I thought the USB cable (power wise) just served as a function for charging the battery, not a direct source of power.
"It does if it cannot supply enough power to the device. Usually an Amp that sources it's power from USB should be designed with the USB interface standard in mind. It would be flawed to design a 500W USB powered monoblock."
Right, obviously, but I meant in cases where IT IS enough either way but still different in the amount transmitted.
"If things were kosher and you still heard differences between two standard USB cables... Then do tell what cables u used!"
I never did this test as it's way to prone to placebo. That's why I came here after searching, assuming there was possibly a well established answer SPECIFICALLY TO THIS and not just to theories which people apply.
And uh, thanks again for the response. :)
Edited by Typhoon859 - 8/22/12 at 7:39pm