When I ordered my WiiM Pro, I ordered a cheap digital coax cable that claimed to be 75 ohms and would be delivered the same day. I used it, and it sounded fine. I got curious, plus wanted a slightly longer cable, so I ordered a digital coax cable from Blue Jeans Cables. The audible difference for the better with the Blue Jeans cable was obvious. Even my fiancé could tell, and that's saying something.