The best alternatives to Sonos Beam are Sonos, Phantom, and Sonos Arc. If these 3 options don't work for you, we've listed a few more alternatives below.
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The Arc is more than a soundbar, too. It's also an app- or voice-controlled wireless speaker with access to practically every music streaming service, and it can be combined with other Sonos speakers in order to create a more complete surround sound arrangement or a multi-room system.
Ses helps you to control your Sonos speakers from the system menu bar and unlike the offiicial Sonos app, it does not sit in your dock and does not cover the full screen when you need to control the playback or volume.