Sonos has been pretty the past couple of years, what with the Sonos One, Beam, and Amp. But according to an FCC filing unearthed by Variety, it’s already preparing another addition to its line-up: a satellite speaker codenamed ‘S18.’ Though the filing is light on details, it’s enough to get a solid idea of what Sonos is planning. The document lists the Sonos Playbar as a ‘Master’ device, while the S18, is referred to as a “wireless smart speaker (right)”. This seems to indicate the S18 is meant to be used as a satellite speaker for the Playbar. Presumably, it’ll be…

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