As far as Speed rating goes I agree with the others here stating anything CAT5e and above is fine, BUT if you look at all of the factors that Audiophiles CALM cause poorer sound quality or interference, I must suggest the Better shielding, and that means CAT 6, 7, or better, is a must. That is what those higher ratings are about shielding and blocking interference.
ETHERNET CABLES
When using ethernet for hooking up streaming devices and dacs, what cat level of ethernet cable should be used. Is there any sonic improvement by going to a higher dollar cat 7 or 8 cable?