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post #21 of 26
I've seen only one place selling USB galvanic isolators and they tend to be expensive, and no support for USB 2.0 speeds. USB connection acts as a ground, if you want to be absolutely redundant you can always get a self-powered DAC with optical TOSLINK connection and balanced outputs biggrin.gif

In my experience balanced connection from an USB sound card has fixed the problem mostly with very little residual noise, whereas unbalanced + galvanic isolation only attenuated the noise slightly. In both cases if I've lowered the maximum volume slightly from the active speakers in addition to either of the solutions, the noise has become mostly insignificant. I suspect you won't be listening at the maximum SPL output of the speakers so use the volume knob in a negative position instead of digital volume control to deliver maximum signal/noise ratio from your sound card/interface.
Edited by seepra - 10/16/13 at 2:54am
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post #22 of 26
Thread Starter 
Hi,

I received the ART DTI, and although RCA / RCA bridge still reduce the hum, it is still quite here.
However, when using RCA -> TRS conversion, thats perfect, cristal clear sound !

I'm now wondering if this DI box is affecting the signal coming from the Xonar STX (is a 200$ sound card still worth it when connecting through the DI box ?)

Thanks all for your answers.
post #23 of 26
The DI box can't affect the output of the sound card directly. DI boxes basically transform unbalanced to balanced, which gets rid of plenty of common-mode noise and interference, and apparently this solution got rid of the noise in this case. To locate the exact causality as to why (where does the noise originate from and what exact part of the signal chain does it affect) would be a lot more difficult than to just call it a day and be left wondering.

Good news is though, that if your DI-box supports two simultaneous inputs you can do a blind A/B test between the sound card and your integrated audio solution to find out if the $200 card is actually worth it biggrin.gif
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post #24 of 26
Thread Starter 
nice idea, but as you say, i prefer to keep wondering ^^

btw the DI accept RCA/TRS/XLR inputs, same for outputs, but only one of each, thus not allowing me to plug soundcard and on board at the same time, but i could of course test sequentially by plugging unplugging smile.gif
post #25 of 26
For the test to be valid you should have someone else be swapping them so that you never know which one is playing. If an actual difference exists, you should very easily be able to discern between the two and reliably tell which one is playing without knowing which one actually is it. If you know for a fact which one is playing you will subconsciously guide your attention towards different factors in the sound that you would expect to change, and might perceive them as changed even if they didn't, so to get reliable results you must be doing the test "blind".

Anyway, I'm glad your problem was solved!
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post #26 of 26
Thread Starter 
Perfect, i will definitely do that and tell you the outcome.
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