"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 ?

I'd use coax, which is inherently screened, and really pretty good low
inductance, low capacitance speaker cable. Belden makes some with 11 gauge
copper center conductors and heavy copper braid shield that has enough
conductivity for longer and/or more critical applications.