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which quality USB cable to consider?


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http://mvicha.sweb.cz/test USB kabelu.pdf
http://mvicha.sweb.cz/test USB kabelu 2014.pdf

http://www.whatsbestforum.com/showthread.php?23024-Why-Do-Different-USB-Cables-Sound-Different&p=448050&viewfull=1#post448050

Quote

The issue isn't the ones & zeroes - they are delivered as expected. What seems to be different between cables is the signal waveform of the digital signal arriving at the receiver.

There are a number of ways this signal waveform can be different but the USB standard specifies a range of acceptable distortion in this waveform - basically the USB standard defines a 'safe' level of distortion in the signal waveform that will avoid bit errors i.e. the ones & zeroes will be correctly received by the receiver.

 

Now a USB cable doesn't just carry the USB signal on two wires within the cable - it also has 2 additional wires in the cable, ground & 5V power & finally has a shield. These two wires & shield further complicate matters when it comes to signal integrity. All can carry noise between the PC & the USB receiving device - noise is just another signal waveform distortion as is jitter - neither of these issues affect the delivery of the digital bits (once within the acceptable range of the USB standard).

 

In my experience when there are changes in these factors it can often have an audible effect. Cables can change the noise spectra on the cable, on the cable shield, on the signal wires, on the ground & power wires - all/some of which can have audible effects.

 

I haven't listened to expensive USB cables but have used a cable which is made to suppress EMI noise - http://kgs-ind.com/wp-content/uploads/products/pdf/LNC-Noise-Suppression-USB20-Cable.pdf

 

This cable is not an audiophile offering - it is made for use in airlines, I believe & consists of a flexible ferrite compound fully covering surrounding the 4 USB wires. For those addicted to measurements, look at the noise measurements on the linked page - it shows the reduction in noise in the frequency range 50MHz to 1,000MHz. Now how could reduction in noise in these frequencies have audible effects in the audible range? Objectivists need to be inquisitive enough to investigate but they don't have the necessary motivated or skills, it would appear

 

This was noticeably quieter than my other USB cables but had the side effect of somewhat audibly softening high frequencies. This is not that surprising, as those who have tried ferrous rigs on USB will no doubt attest to.

 

A conversation with Charles Hansen, Gordon Rankin, and Steve Silberman
https://www.computeraudiophile.com/forums/topic/16172-a-conversation-with-charles-hansen-gordon-rankin-and-steve-silberman/

 

 

Gordon Rankin Says I'm Wrong About USB Cable Sound!
https://www.computeraudiophile.com/forums/topic/20226-gordon-rankin-says-im-wrong-about-usb-cable-sound/

 

There's no such thing as digital: A conversation with Charles Hansen, Gordon Rankin, and Steve Silberman
https://www.audiostream.com/content/draft

 

 

There's no such thing as digital: A conversation with Charles Hansen, Gordon Rankin, and Steve Silberman. Part 2
https://www.audiostream.com/content/theres-no-such-thing-digital-conversation-charles-hansen-gordon-rankin-and-steve-silberman-p

 

Q&A with John Swenson. Part 1: What is Digital?
https://www.audiostream.com/content/qa-john-swenson-part-1-what-digital

 

Q&A with John Swenson. Part 2: Are Bits Just Bits?
https://www.audiostream.com/content/qa-john-swenson-part-2-are-bits-just-bits

 

Q&A with John Swenson. Part 3: How bit-perfect software can affect sound
https://www.audiostream.com/content/qa-john-swenson-part-3-how-bit-perfect-software-can-affect-sound

 

Cables, Bits, and Noise: How Cables Can Make A Sound Difference
https://www.audiostream.com/content/cables-bits-and-noise-how-cables-can-make-sound-difference


The "Bits Are Bits" Fallacy and Noise In Mixed Signal Systems
https://www.audiostream.com/content/bits-are-bits-fallacy-and-noise-mixed-signal-systems

 

Gordon Rankin on why USB audio quality varies
http://www.digitalaudioreview.net/2016/05/gordon-rankin-on-why-usb-audio-quality-varies/

 

Digital Errors Don’t Affect Fidelity
http://www.realhd-audio.com/?p=5971

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