Funny that you mentioned that. I once owned a one meter pair of the Au24s. I ran them from my cd player to my preamp. On several occasions, I too failed to get sound through one channel. What I found was that the plugs were not making proper contact. Each time, I had to pull them out and re-insert them, and then things were fine. Sounds like you might be having the same difficulty. Try re-inserting them firmly. Good luck.
