Innuos Pulse Incoming

Hopefully now this adds another voice to the argument of why one would want to upgrade from blue sound. 
she is a beautiful machine and loves having fancy dangling things coming off her back end.

I am currently using synergistic research foundation, SX power cable, Audio quest, carbon AES, DJ labs ethernet cable. 

was gonna say hopefully you’re going to enjoy, but that is not necessary.

Thanks for all responses so far.   Can anyone explain what a S/PDIF is, was told it was digital coax.   I have a Coax cable now that attaches Bluesound to Mac, but it soesnt say anything about S/PDIF in it.  
 

S/PDIF

Overview

S/PDIF, or Sony/Philips Digital Interface, is a standard for transmitting digital audio between devices like TVs, CD players, and amplifiers. It's a uni-directional format that supports compressed surround sound and uncompressed stereo audio. S/PDIF is known for its high fidelity and better sound reproduction because it doesn't add noise to the audio signal. It can carry two channels of uncompressed PCM audio or compressed 5.1/7.1 surround sound like Dolby Digital or DTS. 

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Yes your coax is an S/PDIF along with your optical out. 
my guess is you’re gonna go on a USB cable search but then that’s just my guess enjoy

On the connection questions the best thing if you can is to try each and see which sounds best. On the ethernet question I was astonished at the great sound I got from Bluejeans ethernet cables for all of $17 for 1M.

On my Pulse I find the USB connection to sound the best. It may depend on the cable you use for each connection though. I have a great digital coax cable and tried many USB cables (all under $300). I liked the Analysis Plus Purple Plus the best.