Directional interconnect cables

Acoustic Zen says the arrow points in the direction of signal flow, e.g., from CDP to pre-amp, from pre-amp to amps, from amps to speakers.

I agree with the common ground idea, "star grounding". However, in the case of a phono pre, this kinda goes out the window:

CDP -> PRE <- AMP = common ground at the pre
TT -> Phono -> Pre <- amp = no real common ground

It depends totally on the manufacturer. Kimber for instance grounds both ends(shields and connectors) of their cables(balanced and single-ended), and the arrow(or direction of the printing) indicates the signal flow.

Tvad- According to you. Many others disagree that cables are non-directional. If you can't hear the difference, fine for you, and connect whatever way you choose. I've satisfied myself through reversing speaker cables, and single-ended interconnects, that cables are indeed directional. The difference may be subtle, but it is indeed there. I believe you referred someone to the book entitled 'The Complete Guide to High-End Audio' some time back(If not- forgive me for the mistaken identity). If you have the book: read the section on "Cable and Interconnect Contruction", particularly the "Conductors" portion. You may find the discussion on copper's grain/chevron structure informative.