I've heard that 1.5m is the optimum length for true 75 ohm digital cable. But hey, what do I know? I own two Illumination D-60 cables, one 0.5m and the other 1m!! Yes- they are great for the $$. Enjoy!
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Sutts, have you compared the 0.5 and 1.0 meter. There are numerous sources that claim that digital cables under 1.0 meter have digital reflections that tranlate into jitter. If this is true, you should here harsher highs and poorer bass on the short cable. I do not have two cables of varying lengths to test this myself, but would be interested to know if you (or anyone else) find a difference testing different lengths.
I too have a Kimber illuminations D-60. It is a 1.5 meter RCA to RCA. I have visited the hellohifi.com page which states optimum length being from 1.5 meters to 4 meters in the rca to rca run. In the BNC to BNC and XLR to XLR configuration he recommends 1 meter to 3.5 meters with the longer length sounding better. Personally I run my D-60 into a Dodson DA-217 MK II D. I have never noticed any effects that others claim to hear, but my speakers are the last obastacle for me to reach the true high end.