I should add my 2cents about issue.
SPDIF signal is an analogue signal called "digital". In fact there are 1s and 0s impulses where information can be lost or non-synchronization error accour. True digital signal is what we have on flash devices, mp3 players etc. even CD is not truly digital device in fact. Limitless copying does not affect the signal - this is data.
I am not technician in this area. But I understand it like this. When we copy/paste via windows/mac file transfer program is written to control the data loss. But in SPDIF is nothing like that created. 700mb CD is in fact 1400mb where 700mb is used for data and another 700mb for error. 4.7gb dvd is in fact 9.4gb etc. What I am trying to say if we had an option to ensure the accuracy of data trasfer between converter and DAW all word clocks and hi-end cables could be thrown from window and burned. But when we deal with real-time performance with no "cache" ofcourse this system cant work without errors. I believe Fletcher about "much better sound" with clocking externally and SOS paper graphs does not mean performance.
Digital cables does make sance. RCA cinch SPDIF was truly a big deal for me. I have issue when I use hadware sample rate convertor. I ve tested usual Alva cabels vs. custom Tasker connectors by 96 to 96 sample rate conversion. I am so sorry I cant share the test results because the album is not released yet.. But if the time would come I will. I played samples to musicians and pros.. they all heard the difference!
I strongly recommend to use short SPDIF connection. Best cable for this signal is usual TV ANTENNA cable. There was audible difference between ALVA SPDIF cable and handmade tasker cinch-antenna cable. Better instrument placement / less phase distrotion - better performance.
But after all that "monkey searching" I still had issue with quality loss when runnig spdif signal via "better" av cable. The mids are less full and precise. Audio seems to be punchier in base and ligher in his.. but in fact there is a cut (loss) in mids.
After getting optical
cables I forgot about this issue. Lightpipe sounds much richer to my ears with no audible loss imho as with RCAs.
If the difference after getting top word clock is at least the same.. it makes sance for me to get one.
Sorry for very controversial post.