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USB vs SPDIF, which sounds better?

I am currently using an Audience AU24 SE USB cable between my Aurender N10 music server and the Lampizator Big 7 dac. Since both components have the SPDIF connection, I am wondering if the SPDIF would sound better than the USB. If so, what are some good digital RCA cables available today?  Thanks for your input.
respected_ent
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celander
1,503 posts
 
The ground loop issues of a USB cable can be mitigated by using an unpowered version (data only) of the USB cable. Several high end companies offer this sort of cable (Sablon Audio, for example). 
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celander
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@respected_ent  Mike Powell goes by the user name @mikepowellaudio here on Audiogon. 
respected_ent OP
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@mid40sguy Yes, you are right about the clock and the DSD.  So, if both USB and SPDIF cables are connected from the N10 to the DAC, then how does the PCM signal know to go through the SPDIF connection and not through the USB connection?  Does N10 have an internal mechanism to detect that the SPDIF is connected, so it will use it as opposed to the USB? 

@celander Thanks for the info again.  I've tried the Sablon data only USB cable, and to me the Audience Au24 SE USB still sounds better in my system.

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celander
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@respected_ent Your DAC should be used to select the digital input. 
respected_ent OP
189 posts
 
I just double-checked the back of my Big 7, and there is no toggle switch to switch between USB and SPDIF.  Does this mean I can only have 1 cable physically hooked up at a time?  I may need to check with Lampizator on this.
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