Stupid noise problem with composite cable

When I got my Wii Composite Cable, I was a bit anonyed by the noise I got one the screw once in a while. Now that I have the PSP Composite Cable, I got the exact same problem. After some experimentation, I realized that it's mostly because the audio stereo cable part. If the audio is not connected, I won't get those noise.

Guess I need to tolerent it then :-<