Eiron,
Indeed I have heard of AC current, but I do belive that audio signals
are in fact a low level DC current. In all my work with Audio, I have
never heard of an AC audio signal. Please let me know if I am wrong in
this point.

Eiron wrote:
AudioGeek wrote:


What I have designed is a switch box that allows me to select which
computer signal goes to which speaker set, with diode protection on
the
inputs from the computers to prevent backfeed.

Have you heard of alternating current, aka AC?
A switch box with a DPDT switch will do the trick
but you don't need the diodes.

--
Eiron.