When Sonos unveiled the Sonos Arc Ultra soundbar earlier this week, we had a few questions. And now we have the answers.In particular, we’ve confirmation about the Arc Ultra’s Dolby Atmos channels, its current stance on DTS, and its HDMI ports – and we’ve had an update on the status of the app.The first questions was around its channel count, which is officially given as 9.1.4. The last number there is the relevant part – it means four height
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