|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
87.114.76.91
In Reply to: RE: John Swenson on Sata cables posted by Ugly on July 10, 2014 at 07:35:54
Removing motherboard PC power has a major beneficial impact on sound quality ie, it reduces or removes (depending how far you go) digititise.
I am here talking about playing native 24 or 32 bit 176.4k/192k files and DSD64/128. By how far, I mean playing attention to services and processes slimming, grounding, quality of replay equipment etc. The simple way to do it is to buy something like the iFi USB power and use a twin headed cable. I actually power mine from a Jung type superregulator with preregulator and use two if I am also doing usb to spdif conversion..
The error rate is something else. I have found (as have others) that XMOS and Rigisystems usb audio devices can show Errors on their supplied control software. In my systems, this does not result in dropouts or pops.
Gordon has been reported to have found errors in usb audio transfer in both PCs and MACs. He does not say what the audio effects are. Audioengr has also found such errors. Since data integrity is not guaranteed in usb2, this is not surprising. If you go to computeraudiophile.com, you will find a thread there. I have asked a designer with a Theyscon license to forward details to them, to find out exactly what the measured results
mean and what the software is measuring.
HiFiNews in UK measure usb eye patterns in usb cable tests and if you subscribe, you have access to a mass of raw data for all their tests. These demonstrate large variations in rise time and noise content. So, it is also not surprising that usb cables alter the sound, as many of us know and attempt to optimise cabling to a system.
I am now sufficiently 'old' to not bother about too many measurements as my experience is that the conventional ones have little correlation with SQ.
There are, however, indicative measures such as signal integrity in digital data transfer (including fast enough risetime, symmetry, lack of oscillations etc) that do correlate as well as the need for the old analog 'requirement' for high end systems to have a widebanwidth without phase distortions such as those caused by -100dB brick wall filters for 44,1 PCM audio. Low jitter interfaces are, of course. a must.
I believe that, unless we go into great technical depth in signal tracing in a computer audio system, there is not really much that can be debated about. Subjective assessment based on sound principles in system setup is therefore a lot easier.
Follow Ups:
"Removing motherboard PC power has a major beneficial impact on sound quality ie, it reduces or removes (depending how far you go) digititise."
This sounds like some issue with the analog hardware not usb if you are sure you are not getting data errors.
"data integrity is not guaranteed in usb2"
What gives you this idea?
"Low jitter interfaces are, of course. a must."
Why would usb jitter matter in a system receiving data asynchronously and clocking the data to the dac with a high quality clock?
"I believe that, unless we go into great technical depth in signal tracing in a computer audio system, there is not really much that can be debated about"
I think you are wrong. If you are seeing data errors there is the debate about what is causing them. If you are having susceptibility problems there is the debate about how to deal with it.
I don't think it will be profitable to respond since you have decided in advance what the outcome should be.
Actually, I was more wondering what went wrong. Up to you.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: