Polk Audio Omni S2

The compact Polk Omni S2 is one of the least-expensive Play-Fi multiroom speakers yet. It offers a big soundstage and lots of bass. The speaker sounds even better in stereo mode, and it's easy to set up -- unlike the comparable Yamaha.

No Bluetooth support. The Play-Fi app can be a little daunting for beginners. No way to adjust the sound quality -- no EQ, for example -- and it could sound confused with the wrong music. The superior Sonos One is only little more expensive.

The Polk Omni S2 is a well-priced, versatile Play-Fi speaker with decent sound quality, but Sonos' shadow looms large.