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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
djones51
4,947 posts
 
Benchmark has very good application notes. I've read most of them their DACs perform very well in reducing USB noise. 
three_easy_payments's avatar
three_easy_payments
2,097 posts
 
Question for this group.  When we talk about USB noise, what does that typically sound like?  I recently started having an issue with my DAC only when using the USB connection.  It makes a high pitched, almost ultrasonic whine when I begin streaming music from my Lumin to the DAC.  This noise isn't present when I use my AES connection.
nicktheknife OP
194 posts
 

three_easy_payments
Good question.  I have wondering the same thing.  I had some noise/distortion come out of my right speaker with my laptop connected.  I had the suspicion that it was just some tube noise ... maybe?
three_easy_payments's avatar
three_easy_payments
2,097 posts
 
@nicktheknife  Well it seems my DAC USB module may have just needed a "reset".  I have a Lampizator Atlantic TRP DAC.  In order to use the USB module you have to engage a ring button switch.  Apparently I was able to to make the high pitch noise go away simply by disengaging the ring USB module then re-engaging it.  Presto - problem solved...at least for now.

If you do a search on google there are a lot of reports of high frequency noise produced by USB connections.
coachpoconnor's avatar
coachpoconnor
380 posts
 
I have owned the DAC it and thought it nice piece of kit for the money. A Brooklyn Bridge would give you a good sounding MQA capable DAC plus streaming.
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