What is the most important cable in your system

Just thinking out loud:

1. Ethernet 

2. power 

3. Speaker 

4. interconnect 

The cable from the Turntable to the phono preamp.

@sandthemall I agree.

YEP. PREAMP TO AMP THEN FOR ME.POWER CORD TO PREAMP

Well, since I have a Bel Canto E1X integrated amp/dac/streamer, it's the power cable of course - Cardas Clear :>)

Perhaps the primary power cable (Shunyata Alpha v2) that connects to my passive mains power block (Shunyata Denali v2) feeding the whole frontend of my kit from the city mains source. The interconnect cables from my preamp to mono block amplifiers might well be the most significant if it were not for the dual differential balanced topology of the Atma-Sphere gear on either end. Which renders the cable basically irrelevant beyond a decent Mogani studio grade XLR.