Several ways to do this. On Ubuntu, one could use PulseAudio's networked audio. You could tune your source with instance of VLC, streaming at a port, and tune o

Several ways to do this. On Ubuntu, one could use PulseAudio's networked audio. You could tune your source with instance of VLC, streaming at a port, and tune other VLC instances on the network to that port. On windows you could run a Shoutcast server, even recording from line in or the master audio (depending on soundcard drivers) and tune that in with your favorite audio program on other machines. There are really quite a few programs that do audio streaming and tune in audio streaming. Most any way that I can think of digitally will cause audio delay, because computers simply don't have the timing.