JohnFerrier
1000+ Head-Fier
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I don't know, but what kind of jitter resolution are speakers/headphones capable of?
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Originally Posted by JohnFerrier /img/forum/go_quote.gif I don't know, but what kind of jitter resolution are speakers/headphones capable of? . |
Originally Posted by JohnFerrier /img/forum/go_quote.gif I don't know, but what kind of jitter resolution are speakers/headphones capable of? . |
Originally Posted by Budgie /img/forum/go_quote.gif Eric Benjamin and Benjamin Gannon, "Theoretical and Audible Effects of Jitter on Digital Audio Quality", Pre-print 4826 of the 105th AES Convention, San Francisco, September 1998. This paper concluded that the threshold of audibility of jitter on normal music signals is around 20ns. Thats just one conclusion. I find many sources that have tested listeners and found much higher rates of jitter to be effectivley inaudible- |
Originally Posted by Budgie /img/forum/go_quote.gif Oh ya, back to power cables- I never thought I would quote a cable seller on anything, but one company seems to be bucking the power cable snake oil and B.S. trend - Blue Jeans Cable--Does Wire Matter? Qoute- Absent some sort of known malfunction, there's very little reason to think that replacement of control or power cables will improve your system's performance at all. There have been a lot of strange claims made in recent years about power cords, and people paying hundreds or even thousands of dollars for them; but the fact is that a power cord, so long as it's well-constructed and undamaged, correctly sized for the load, and driving a reasonably well-designed power supply, should make no difference whatsoever to the sound of your system. The same goes for these other non-signal cables. If they seem to be working, don't mess with them. |
Budgie;4364789 said:Eric Benjamin and Benjamin Gannon, "Theoretical and Audible Effects of Jitter on Digital Audio Quality", Pre-print 4826 of the 105th AES Convention, San Francisco, September 1998. This paper concluded that the threshold of audibility of jitter on normal music signals is around 20ns./QUOTE]
Um, yeah, okay, but... any DAC worth it's salt uses it's own internal clock, i.e. it re-clocks the data so you would have to have an incredibly bad cable to affect it.
As a test I connected two sound cards together with an expensive glass optical cable and a cheap eBay plastic one. I then played back an audio sample that alternates between sine waves of various frequencies and random noise, and recorded it on the other PC. I then wrote a program to check the recording and it was bit-for-fit identical the original on both cables. Thus, data was transferred perfected and re-clocked (during recording) perfectly, so at least as far as digital optical cables go they make no difference at all.
Originally Posted by mojo /img/forum/go_quote.gif As a test I connected two sound cards together with an expensive glass optical cable and a cheap eBay plastic one. I then played back an audio sample that alternates between sine waves of various frequencies and random noise, and recorded it on the other PC. I then wrote a program to check the recording and it was bit-for-fit identical the original on both cables. Thus, data was transferred perfected and re-clocked (during recording) perfectly, so at least as far as digital optical cables go they make no difference at all. |
Originally Posted by Budgie /img/forum/go_quote.gif It's not that I "believe" BJC, it's that I agree. There is nothing magical or mystical (or even difficult) about understanding how to get 120/220 vac at one frequency (50 or 60 hz usually) to travel up three or four feet (one or two meters) of copper wire. It's all very basic electrical principals, that I learned back in the 70's during the educational process of getting my technicians liscense. I am still waiting for anything like a realistic plausible explanation as to why a power cord might make a difference (especially after not finding an audible differance in my own "listening tests"). Till that happens, I will consider the case to be allready proven. Power cables are only for decoration. |