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USB cables and Galvanic Isolation

I've seen that some Dac manufacturers tout having galvanic isolated usb ports.
Does this mean that the Dac is immune to noise/jitter generated by a computer usb port connected to it?
And will a special noise isolating USB cable be required in this instance?
I've seen a lot of threads touting audiophile usb cables and at present I'm not using one.  I am using an Amazon Basics usb cable from my computer to a Peachtree DACitx.  I have been thinking of upgrading the Peachtree as it was my first external Dac which I am happy with but curious as to how much of a jump in SQ I will hear with a newer more expensive DAC. 
Although, I'm not disappointed in the sound I'm getting from the computer, after reading on-line forums that computers generate a lot of noise and mess with the sound I'm a little leary of usb audio.
nicktheknife
thyname's avatar
thyname
3,107 posts
 
If you listen to (read: read) Dow Jones here, nothing matters, nothing makes a difference, all snake oil, blah ... blah... check out all his posts. You will learn nothing. That's the reason he exists. His hobby.

Do yourself a favor, and try a nice cable. Even if entry level from Wireworld or AQ, or Triode Wire Labs. You may be surprised. We can talk all day here, but nothing is substitute to actually trying.
nicktheknife OP
194 posts
 
I've made up my mind that I will try a better quality cable.  No harm, no foul.   
Except the question is which one?  
Any max. length as far as usb cables go?
thyname's avatar
thyname
3,107 posts
 
Hopefully Dow Jones will not report this one and get it deleted:

Length does not matter, but preferably short. About 1-1.5 meter no longer, if your equipment proximity allows. 50 cm would work well too.

As for which one, depends on budget. Examples: entry level Wireworld, AQ, Triode Wire Labs, Supra, Sablon
djones51
4,947 posts
 
I've tried Kimber and didn't notice a difference of course I had my wife switch between the expensive and generic cable to eliminate bias. Try the DH Labs you mentioned.
oldhvymec
5,101 posts
 
Why is galvanic isolation so important? I know what the definition is.
What does it improve? Why isn't it used all the time. Galvanic action, is growing barnacles, isn't it? To galvanise, is to Zinc plate iron, right?

So what is galvanic isolation?

Just wondering?

Regards
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