Sonos syncs things up well-enough that a pair of them can be used in stereo. The stereo pair will play in-phase (allowing for imaging like with conventional st

Sonos syncs things up well-enough that a pair of them can be used in stereo. The stereo pair will play in-phase (allowing for imaging like with conventional stereo rigs), and stay locked together even as devices are added and removed to/from a group. Do DIY solutions accomplish this?