Why do digital cables sound different?

I'm not denying reality, just looking for plausible explanations of it, and pointing out that existence of a plausible explanation (other than placebo effect) means that our beloved audio equipment has design deficiencies. Consider the case of digital cable interconnects between computer equipment: either they work right or they don't. One does not swap printer cables, for example, hoping to increase the resolution of the printed page! If it is indeed the case that digital cables have effect on the sound, why is this an acceptable situation? The whole point of digital technology is to avoid these degradations entirely. I expect more for my dollars, and want to spend more on source material, and less on "work-arounds" (e.g., esoteric cables needed to compensate for performance shortfalls in the equipment design).

1439, I was speaking generally and not personally. It seems to me that some high end companies like VAC and Mark Levinson are adressing a similar issue by manufacturing integrated amps, (no need for pre-amp to amp interconnects) I am sure that one day cables will be eliminated altogether. 1439, I'm with you on wanting to spend more on source gear, but even with well designed equipment the cabling still effects sound. To get the best almost always takes more money. .

1439 - I agree with your point 100% and have made it myself many times - if differences are heard using different cables, the bits must be being altered (a bad thing)and if they are, then we as consumers should be demanding a better technology for the interface, not spending a bunch of money on cables and transports. As you say, you can transfer bits perfectly in the computing world with good quality but relatively cheap cabling and absurdly inexpensive hardware. If a DAC with an ethernet input interface was available, it would be easy to set up a whole-house music distribution system that performs as well (or better, if transport technology is as spotty as it would appear it is) as the best transports. Hopefully such an interface isn't too far off in the future.

You make a mistake if you think that just transmitting the bits accurately is all that is required. Jitter (or time-based distortion) is irrelevant when there is no need for time syncronous transmission - ie. computer communications. But in audio or video you must deal/live with time-based distortion. Don't fall for the marketing BS that says a Levinson DAC or a Discman eliminates time-based issues through buffering. And by the way, don't believe that doing away with cables eliminates the problem either - otherwise we would have stuck with the three-in-one music centres of the 60's - Bmpnyc, your dream came true forty years ago.

bmpnyc... no offense taken. If there's a physical effect, then there's a physical cause. If there's no physical cause, there can be no physical effect. Those of us with the scientific mindset seek to comprehend the linkage. Understanding the linkage is every bit as enjoyable to me as other intangibles such as "beautiful design" and "great build quality".