Kimber Illuminations D-60, proper length


Alright, who owns this one? I just bought a 1 meter run and I'm in love. Silver is the best! The harshness in the highs and mids just jumped out of my home theater and ran away! I can't wait to break this cable in a little more. Anyway, to my question, what length digital interconnect is recommended? A guy in a store was trying to tell me that .75 meters is the optimum length for a digital cable. I can't see that it would matter unless the length was really long, but then again I'm not an expert on the subject, I just spend money. Was he just trying to sell me something? He didn't sell the D-60 anyway, and I had to buy it mail order eventually.
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I have two d-60's (both BNC to RCA), one 1 meter, 1 1 1/2 meter. I can't hear any difference. But maybe a hunting dog could.
I own several Illuminations D-60’s, (.5/M, 1/M and 1.5/M) after critically listening to them all on the same system with the same sample music I could not differentiate a difference. Perhaps others could.
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.