I use to firmly believe it was the cables between my preamp and my amps were most critical. Then over years with more testing found the cables between source and preamp matter a lot too, more so. However, recently went back and started rotating in/out different digital SPDIF/Coax cables between my digital sources and my DAC, noting real differences - more so than I previously recalled. 0s & 1s, right - no, there is more. By default, in my system the most important cable in my system starts at the source. Trickles down from there. I suspect opinions will vary just like different levels of quality sources do.
