Actually, I was going to go wireless -- wireless network, wireless speakers -- and then discovered that they, like the wireless phones we have, use the 900 MHz and 2.4 GHz frequencies.

I wasn't worried so much about security (that can be set) as I was about telephone interference from the wireless speakers, which have no IEEE standards as wireless nets do. So, for the time being, we've hardwired two rooms with Cat 5e so that we can put each computer into the net.

I've chucked the idea of wireless speakers and will be installing a good set of wired ones. Anyone know if a single RCA/coax plug in a jack labeled "phono" can broadcast through a whole-house (NuTone) intercom/AM-FM radio system from 1968? (he asked, tongue firmly in cheek).