There is no ethernet cable in the world which is sufficiently bad, that there are enough retransmits for mere audio to stutter or stall.
Oh? Why not? Most people will be able to hear 1/50th of a millisecond of missing data. Regardless of bandwidth, if your transmission drop requires a round-trip re-request of data, the latency of the connection can delay the arrival of the data past the point where it is needed to be played.