Sonos has been the best wireless multiroom audio system for so long, it’s hard to remember a time that it wasn’t around.  And for the last 10 years at least, pretenders have tried to nab the crown for themselves. One of the most serious of these is DTS, the same company behind the theater and home surround-sound format. Its Play-Fi system has been with us since 2013 and is now supported by over 20 brands.

I’ve reviewed several sound bars featuring Play-Fi over the years, but I haven’t looked at a compatible budget speaker since the deplorable Phorus PS1. Unlike that wobbly first step into Wi-Fi speakers, the Polk Omni S2 is a polished product which offers fine sound quality for the money, and costs less than Sonos’ superb entry-level One speaker. But unless you’re already invested in Play-Fi, Sonos is worth the extra money.
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https://www.cnet.com/reviews/polk-audio-omni-s2-review/