I have a Sonos that came with my house. It's actually the least of my worries.<p>The house was built about 10 years ago with what (I presume) was a state-of-the-art system at the time - an "AudioAccess WHEN" system. It works fine - there are keypads and speakers in every room, and I can pipe audio from the Sonos (or an Airplay receiver) to anywhere.<p>It's a weird topology, however - the speakers in each room are wired to the <i>keypads</i> (which is where the amps live). Each keypad has a power connection, and some kind of (presumably proprietary) Cat-5 connection to a central hub. The hub in turn is connected via Cat-5 to a head unit with FM receiver, CD/AUX inputs, etc...<p>When we moved into the house, the head unit wasn't working - it refused to establish a connection to the hub. I managed to track down a working tech support phone number, only to hear that they don't make this system any more, and that the head units often fail in this way. I managed to find what may have been the last replacement head unit in existence on Ebay - bought it, and fortunately everything started working!<p>I am, however, dreading the day when it inevitably dies. Since the speaker wires go to the keypad amps, and not to the wiring closet (where the hubs live), I'm not sure what I could replace it with - beyond re-running new speaker wire to a completely new system in the wiring closet.