Sonos S2: Major update arrives for smart speakers, with new app to download

Sonos has released a major new update for both its app and its smart speakers' operating system. The new software, known as S2, brings a range of new features including more high-quality audio. Sonos has suggested that it will also allow for further updates in the future. But it has also proved controversial because it is not being released for some of the company's older speakers. That means not only that many products are incompatible with it, but that any system using those older speakers will be incompatible too.