@soix Yes 1.5m is minimum to avoid reflections. It is assumed that cable is not perfectly impedance matched, causing reflection of the signal on impedance boundary. The dangerous one is the first reflection from the end of the cable. If cable is long enough for reflection to come back late (to miss edge that originated it), then reflection won't distort (add to) this transition. Distorted transition, often staircase like, affects time moment of level recognition (threshold) leading to time jitter, that after D/A conversion translates basically to added noise (reduced clarity).
Suggestions for a digital cable.
My only experience with digital cables are the ones I own, which I like and most likely will stick with. I have the Illuminations D60 from streamer to DDC and the Orchid XLR from CD transport to DDC. I am in the process of evaluating adding a Mini DSP SHD Studio to the system which will go between the Digital sources and the DDC/DAC combo. I have the choice of SPDIF or AESEBU. I am leaning toward another D 60 here. (Far less money than another ORCHID) and willing to look at used connectors for $400 or less. Anything I should look into that would equal to or better than the D 60 for the price? I have a lot of History the the two I have. Thank you! If this matters as well my analogue cabling is Wireworld Eclipse 8 through out and Silversmith Fidelous speaker cabling.