Network or Shared speakers?

[mendhak]

Are there any speakers that sit on a network as a resource rather than being plugged into the sound card?

The context is that I have 6 machines and I'd like to play music on the speakers without having to unplug-plug speakers into different machines. Instead, have the speakers sit somewhere and send sound to the speakers and have it play from whatever machine I'm using.

I'm pretty sure they exist, but I just keep finding in-wall speakers, I just want something like normal speakers that go on either side of the monitor (or wireless, something I can move around).

Ideas?