Sonos unveiled three all-new higher-end speakers today: The $799 Sonos Arc, a roundish soundbar with support for Dolby Atmos object-based audio; the $699 Sonos Sub (Gen 3), a dual-driver, dual-amplifier subwoofer; and the $499 Play 5, a 14-pound speaker with six drivers and an equal number of Class D amplifiers. […]