The living room has 4 in-ceiling speakers and I discovered a single Sonos ZonePlayer can safely drive all four speakers. Here is what Sonos Support says on the topic …

The Sonos ZonePlayers can support any speaker impedance between 4 and 16 Ohms so it is possible to wire two 8 Ohm speakers in parallel (resulting in a total impedance of 4 Ohm’s). Sonos does not recommend wiring speakers in series as it will result in poor sound quality. *This applies to the amplified ZP120 and ZP100 only. DO NOT attempt to wire 4 Ohm speakers in parallel to the ZonePlayer

The sound is quite good. I have a mix of the new ZonePlayer 120 amplified modules as well as the older ZonePlayer 100 modules. Given the improved amplifier technology and slightly greater power, I am using the ZP120 for the living room.

In case you were curious what’s currently playing, it’s last.fm streaming "Michael Buble’ Similar Artists" …