Do you really need rear surround channels?

The Samsung HW-N850 is a mid-range soundbar and sits just below the flagship HW-N950 in the company’s line-up. The N850 uses exactly the same main unit and subwoofer as the N950, so the only thing missing is the rear wireless speakers. That means you still get the upward and side-firing drivers built into the soundbar itself, and support for Dolby Atmos and DTS:X.
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https://www.avforums.com/review/samsung-hw-n850-soundbar-review.15432