For what reason would you want to do this? It's useless.
Speaker leads are loaded with a very low impedance (a few ohms).
There is no reason to fear antenna-style interference phenomena with them.

"chris" wrote in message
news:wQ%Va.24658$YN5.23420@sccrnsc01...
If you wanted to screen your speaker leads against EMI/RFI pickup, at what
distance from the core of the wire would you put the screening ?