This is a tough one that i'm currently working on trying to solve for my specific systems. I will only say that if the transport is exactly 75 ohms, the cable is 75 ohms and the DAC is 75 ohms, any length of cable is fine with the shortest length being the best. The same would be true if they were all 50 ohms, 110 ohms, etc... If any of the variables ( impedance of transport, cable, DAC ) are altered independently of each other, the line length will act as an impedance transformer and could either increase or reduce the amount of vswr / reflections that the transport sees depending on the length used.
Having said that, my thoughts are that anybody that can tell you that one length is better than another ( other than talking about line loss ) without knowing all of the factors that i previously mentioned is talking gibberish. I know that Kimber used to say that 1.5 meters was a "magic length", but i don't know how they arrived at that figure. Probably talked to the same guy that you did : ) Sean
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PS... most guys that work on RF can't answer this question without asking a bunch of complicated questions, let alone someone that works on audio gear being able to answer this question at all.
Having said that, my thoughts are that anybody that can tell you that one length is better than another ( other than talking about line loss ) without knowing all of the factors that i previously mentioned is talking gibberish. I know that Kimber used to say that 1.5 meters was a "magic length", but i don't know how they arrived at that figure. Probably talked to the same guy that you did : ) Sean
>
PS... most guys that work on RF can't answer this question without asking a bunch of complicated questions, let alone someone that works on audio gear being able to answer this question at all.