Why do digital cables sound different?

First of all, the different digital interfaces have different bandwidth. Within a single intrface type, even slight imperfections can cause signal loss. Only ATT optical has enough bandwidth to handle all the dat correctly. Yes this lame by todays standards, but it was leading edge 20 years ago.

I would like to reply to your question. No, No, No, No, No, No!!!!! There is simply no way that any digital cable can color or change the sound of a system. While there are physical reasons why analog cables (interconnects, speaker cables etc.) can have an effect on sound quality it is beyond the laws of physical possibility for a digital cable to have an effect. The D/A in your equipment could care less if the 0111001111 bit stream came from a piece of copper or fiberoptic material. I understand that audio is very subjective but one must be careful when opening one's mouth. Consider the ramifications of someone taking what you are saying as gospel and purchasing an expensive cable what there is no physical possibility the cable will effect the sound one bit.

Bruce, cut the crap! We are not talking about frequencies in the GHz region. These are simple logic levels moving at less than a MHz. I have been a digital designer for 20 years and have never heard such garbage. I there is any effect at all it would result from delay caused by capacitance in the cable not by excessive standing waves. If I knew what the impedance of the DAC was, I bet we would would see very little return loss if we swept the cable on a network analyzer even up to 50 MHz. Sorry to burst your bubble but you are way off base.

With all due respect, and I respect your 20 year experience as a digital designer, my 25 years as a professional musician tell me very loudly and clearly that I hear these differences. What's more, they aren't all that subtle in many cases. My musical colleagues (those that care about these things )also hear them. Is it not more productive and potentially enlightening to consider as plausible what the ears of those who use them for a living hear. I hate to break your bubble, but I assure you that the subtleties (subtle variations in timbre, pitch, time etc. ) that a musician has to be sensitive to playing in say a Brahms clarinet trio are far more subtle in absolute terms than the oftentimes obvious diifferences that are heard between cables, including digital. By the way, digitally recorded music to many colleagues of mine still does't "swing" the way it should and certainly not as well as good analogue. The groove or "fun factor" is diminished; not catastrophically but diminished none the less. I would like to respectfully encourage all of us to do more listening without focusing on the technical aspects of the sound. "Hearing" is not only what takes place in our ears, but letting that go on to touch us emotionally. Then that in turn frees us to "hear" more, and the cycle continues. There is infinitely more to hear/experience in most good music than most think. I remember that years ago when I first started reading the mags a couple of reviewers were fond of pointing out in their description of the prowess (or lack thereof)of various very expensive components, that these components were somehow to be praised for allowing the listener to "hear that the instrument being played was an English horn and not an oboe". This is almost laughable, I assure you that the difference in timbre between these two instruments is so obvious, that they can be easily heard over the lamest grocery store sound system. Then why bother? Because there is so much more than most imagine. I point all of this out only to encourage the cynics to consider the possibility that they are missing out on a whole lot of fun in their listening by letting technical issues dictate what and how much they should be able to hear. Happy listening.

Hey Gmkowal, Digital cables do sound different!. From a theoretical standpoint, there does not seem to be a basis to "different sounding digital cables". As an Electrical Engineer myself, who represents a high end manufacturer of A/D and D/A converters, I absolutley agree with your statements. I, unfortunately, like so many, cannot come up with a good explanation to why different cables yield different sounds. Perhaps it is not the transmission media per say, but the interaction at either or both ends, or a combination, or both, I wish I could find the reason, because it exists!. Sometimes the sonic differences can be as large as changing interconnects, really!. Each D/A converter is different to how large the change may be. (I am currently on my ninth digital front end, and my sixth transport, so I have quite a bit of experience here). If you have already tried to hear the differences (for giggles, since it can't possibly be true), and you don't hear any, then the resolution of your speakers, amplifiers or other components is not allowing you to experience the differences. Some of the major sonic differences between cables involve the harmonic structure of the music , the soundstage width or depth. Unfortunately, this is also the smallest detail to preserve all the way to the speakers. Please try to open your mind on this one, it took me 3 years of preaching "there is no way there can be a difference, I do this for a living!", then (for giggles) I tried to prove my point. Boy, was that an embarassing moment. As a digital designer, you should consider that maybe there is something we are not considering as trained and schooled "experts". In the end, maybe you can become the hero that comes up with a logical reason to "why do digital cables sound different?". I stopped trying, and just listen to music through my best sounding digital interconnect.