Which is better for movies?

The Samsung gives more low-end punch out of the box because the subwoofer is included. The Arc has wider 5.0.2 coverage and better room tuning, but bass is limited without a Sonos Sub.

Do I need a subwoofer with the Sonos Arc?

Not strictly, but the Arc's bass is modest for a bar its size. Most buyers add a Sonos Sub for action films. The Samsung already includes one.

Which works better with a Samsung TV?

The Samsung. Q-Symphony runs the TV speakers alongside the bar, and SpaceFit Sound Pro tunes audio using the TV. The Arc works over HDMI eARC but loses those features.

Is the Sonos Arc worth the extra money?

Yes if you want Wi-Fi streaming, built-in voice control and a system you can expand. No if you mainly want Atmos and bass from one purchase.

Which has better dialogue clarity?

Both have a dedicated center channel. The Samsung's center channel is explicit in its 3.1.2 layout; the Arc's five-channel array spreads dialogue wider. Room shape matters more than the spec here.

Can I add rear speakers to either?

Yes. The Arc pairs with Sonos Era 300 or One SL surrounds and a Sub. The Samsung pairs with Samsung rear speaker kits, but the ecosystem is smaller.

Samsung HW-Q600F Soundbar vs Sonos Arc

Buy the Samsung HW-Q600F if you want a subwoofer in the box and own a Samsung TV. Buy the Sonos Arc if you want a cleaner one-piece bar with Wi-Fi, voice control and a path to a full surround system. The Samsung's 3.1.2 setup includes a wireless subwoofer for deeper bass out of the box; the Arc is a 5.0.2 bar with no sub. Check the latest prices on both at Deal.ai before deciding.

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