Polk Audio Signa S4 vs Yamaha YAS-209
Side-by-side comparison of features, pricing, ratings, and alternatives.
The Polk Audio Signa S4 delivers immersive, cinematic sound to your living room through advanced Dolby Atmos technology and an included wireless subwoofer. Designed to seamlessly integrate with modern 4K and 8K TVs, it transforms everyday television viewing, movie nights, and music listening into a true surround sound experience. Featuring Polk's patented Voice Adjust technology, the sound bar ensures crystal-clear dialogue so you never miss a word. Setup is effortless with the included HDMI eARC and optical cables, allowing you to control the volume using your existing TV remote while enjoying robust, room-filling bass from the down-firing subwoofer.
The Yamaha YAS-209 is a sleek sound bar system designed to significantly upgrade television audio with immersive sound. Featuring a built-in subwoofer and support for DTS Virtual:X, it delivers room-filling 3D surround sound without the need for multiple satellite speakers. Equipped with built-in Amazon Alexa, Wi-Fi, and Bluetooth, the sound bar doubles as a smart speaker for music streaming and home automation control. Its slim profile fits neatly beneath most TVs, while the Controller app simplifies setup and daily operation.
- Immersive Dolby Atmos height effects
- Included wireless subwoofer for deep bass
- Voice Adjust technology for clear dialogue
- Simple setup with HDMI eARC and optical cables
- Built-in subwoofer saves floor space
- DTS Virtual:X provides wide soundstage
- Built-in Amazon Alexa functionality
- Clear Voice mode boosts dialogue clarity
- Lacks built-in smart assistant integration
- No Wi-Fi streaming support built-in
- Limited physical audio inputs beyond HDMI and optical
- Lacks Dolby Atmos support
- Physical remote is small and basic
- Subwoofer bass cannot match a large external unit
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View all →Dolby Atmos sound bar and wireless subwoofer system for immersive home theater audio.
The Verdict
AI-generated from listing dataIf you prioritize true Dolby Atmos height effects and a separate wireless subwoofer, go with the Polk Signa S4; if you want built‑in Alexa, Wi‑Fi streaming and a space‑saving design, the Yamaha YAS‑209 is the safer default.
Key differences
- •Dolby Atmos vs. DTS Virtual:X – Polk offers certified Atmos height channels; Yamaha uses virtual processing only.
- •Subwoofer design – Polk uses a separate wireless subwoofer; Yamaha’s subwoofer is built into the bar.
- •Smart features – Yamaha includes Amazon Alexa and Wi‑Fi/Spotify Connect; Polk lacks any built‑in voice assistant or Wi‑Fi.
- •Connectivity – Polk provides HDMI eARC and optical plus Bluetooth; Yamaha adds Wi‑Fi, Ethernet and HDMI input/out.
Performance
Polk’s dedicated wireless subwoofer and Dolby Atmos certification deliver deeper bass and true height effects.
Build quality
Both units are AC‑powered with comparable weight; Polk’s subwoofer adds extra bulk but no clear quality advantage.
Connectivity
Yamaha adds Wi‑Fi, Ethernet and Spotify Connect, while Polk is limited to Bluetooth and wired inputs.
Power & efficiency
Both use AC power; no efficiency data provided to differentiate.
Compatibility
Polk’s HDMI eARC and optical support uncompressed high‑resolution audio, matching modern TV setups.
Price & value
Yamaha is $349.95 vs. Polk’s $399, offering more features for a lower price.
Warranty & support
Both provide a 1‑year limited warranty.
Choose Polk Audio Signa S4 if…
Home‑theater fans who want true Atmos immersion and separate subwoofer power.
Choose Yamaha YAS-209 if…
Users who need Alexa, Wi‑Fi streaming and a compact, all‑in‑one bar.
Common questions
Which system gives true Dolby Atmos versus simulated height effects?
Polk Audio Signa S4 includes certified Dolby Atmos; Yamaha YAS‑209 uses DTS Virtual:X, which is virtual.
Do either of these soundbars have built‑in voice assistants?
Only the Yamaha YAS‑209 has Amazon Alexa integrated; the Polk Signa S4 has no smart assistant.
Is there a price advantage to choosing one over the other?
Yamaha YAS‑209 costs $349.95, about $50 less than Polk’s $399 MSRP.