Amazon Fire TV Soundbar Plus vs Polk Audio Signa S2

If you''re shopping for an all-in-one soundbar in the mid-range tier, the Amazon Fire TV Soundbar Plus and the Polk Audio Signa S2 represent two genuinely different design philosophies — and the right pick depends almost entirely on whether you care more about modern audio formats or a deeper, room-filling low end.

The Amazon Fire TV Soundbar Plus is the more technically modern of the two. It''s a 3.1-channel all-in-one unit with a dedicated center channel for dialogue, a built-in subwoofer compartment for bass, and — most importantly — native Dolby Atmos and DTS:X decoding. That means anything you stream through Prime Video, Apple TV+, or Netflix in immersive audio gets the proper height-channel processing instead of being downmixed to stereo. The Movie, Music, Sports, and Night modes are content-aware, and the single HDMI eARC cable setup makes installation about as simple as it gets. The trade-off is bass: a sealed-cabinet sub never moves as much air as a separate wireless unit.

The Polk Signa S2 makes the opposite bet. Polk skips Atmos entirely and ships a traditional Dolby Digital stack — but it pairs the slim two-inch-tall bar with a real, separately-housed wireless subwoofer. Five full-range drivers plus that external sub produce noticeably fuller low end on action movies and music than any all-in-one in this price range. Polk''s exclusive VoiceAdjust technology lets you boost dialogue independently from the rest of the mix without flattening the soundstage, and the ultra-slim form factor disappears under most TV stands. It''s worth noting that the Signa S2 has one of the deepest reviewer bases on Amazon for any soundbar, which speaks to how long Polk has been refining this exact recipe.

Choose the Amazon Fire TV Soundbar Plus if you watch a lot of Atmos content and want the cleanest possible single-cable setup, especially if you''re already inside the Fire TV ecosystem. Choose the Polk Signa S2 if you care more about heavy, satisfying bass and clear dialogue than about format support, and you''d rather sacrifice a bit of channel modernity for hardware that''s been battle-tested across years of TV setups.