hi, first post here if this is too long to parse please skip to the actual question in bold, at the end :) I wasn't able to find any other concise title for this. maybe some of you are aware of the fact that in audio some give great importance to cable selection. for some the audible differences are an accepted fact of life and the accepted wisdom is that they can't be explained by impedance (RLC) alone but that there are more "obscure" phenomena at play. I'm a computer egnineer (which includes a bit of EE) so I'm aware of the existence of phenomena like dielectric absorption, capacitance variance with voltage, EMI suspectibility (balanced cables), skin effect, transmission line behaviour (although the importance of the last two at audio frequencies can be questioned). also, note that I don't want to go into a discussion questioning the validity of the above claims, anyone considering this, please just ignore the thread, it is not its objective. so, here goes the actual question: is anyone aware of any field, any at all, where "special" cables are used and other phenomena except the obvious impedance need to be taken into account? by "special" I mean that unusual materials, geometries or construction techniques need to be used in order to ensure the least possible signal degradation. if it's so, I'd also like some study material to investigate further. I just want to look at this from an objective perspective, if there is any reason to consider it. thanks.