Nope, not true at all. Get a cable made up, shouldn't be too expensive, I got a Tara digital cable from Audio Advisor for around $50 a few years back
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A regular rca cable will work but it's not recommended. Yes, coaxial digital has rca's, but the spec. calls for a 75 ohm cable. The cheapest route is to use a decent VIDEO cable because it is the correct 75 ohm impedence. You can also use a high end digital cable, but my video cables work just great for me with my 2 DAT machines.
Hate to spoil the tweaker's party, but Radio Shack sells 75 ohm shielded video cable for $3.95. I've compared this cable with the StraightWire Silver Link and the Tara video cables and found no discernable difference in sound quality. As much as we would like to make a digital signal as arcane as an analog signal, hard science offers no foundation for the argument. 75 ohms resistance is all you need. Cheers.
While a digital signal is just that, digits and not sound, it easy to conclude that any 75 ohm cable will do. But quality does matter in a high end system and it has to do with speed and timing of the signal. It has also been found that a lot of CD Player / Transport outputs and DACs inputs are not a perfect/true 75 ohm, so the cables impedence might be off, but right for your system, so try a few if you can borrow them. The impedence may also change slightly over the frequency response range 20KHz ot 20MHz Stick with Coax over Optical on most applications.