Polk Audio Signa S4 vs Sonos Arc Ultra
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.
Experience cinematic sound with the Sonos Arc Ultra, a premium soundbar that brings immersive audio to your home theater. With 9.1.4-channel virtual surround and HDMI eARC, this soundbar delivers a rich and detailed sound that will transport you to new worlds.
- 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
- Immersive Dolby Atmos sound
- Seamless connectivity with HDMI eARC
- Detailed and nuanced sound with up to 24-bit/192kHz audio resolution
- Compatible with popular voice assistants and streaming services
- Lacks built-in smart assistant integration
- No Wi-Fi streaming support built-in
- Limited physical audio inputs beyond HDMI and optical
- Expensive compared to other soundbars
- Large size may not fit in smaller rooms
- No built-in subwoofer, may require separate purchase
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The Verdict
AI-generated from listing dataPolk Audio Signa S4 offers a complete Dolby Atmos bar with a wireless subwoofer at half the price, while Sonos Arc Ultra provides higher‑resolution audio and smart‑assistant integration but costs much more and lacks a subwoofer.
Key differences
- •Polk includes a wireless subwoofer for deep bass; Sonos requires a separate subwoofer purchase.
- •Sonos supports Wi‑Fi 6, Apple AirPlay 2, and voice assistants; Polk only offers Bluetooth and no built‑in smart assistant.
- •Sonos delivers up to 24‑bit/192 kHz audio resolution, whereas Polk’s audio resolution isn’t specified.
- •Polk’s MSRP is $399 versus Sonos’s $899, a $500 price gap.
- •Sonos is heavier (13.78 lb) and larger (45 × 3.4 × 4.5 in) than Polk’s bar (3.1 lb, 41.3 × 2.4 × 3.7 in).
Pricing & value
Polk’s MSRP $399 is less than half of Sonos’s $899, offering a lower‑cost entry to Dolby Atmos.
Performance
Sonos supports 24‑bit/192 kHz audio resolution, a higher fidelity spec not listed for Polk.
Build quality & weight
Sonos is heavier (13.78 lb) and larger, indicating a more robust chassis; Polk’s bar is lighter and smaller.
Connectivity
Sonos adds Wi‑Fi 6, Apple AirPlay 2, and Bluetooth 5.2; Polk only has Bluetooth, HDMI eARC, optical, aux, USB‑A.
Compatibility
Sonos works with Alexa, Google Assistant, and can integrate with other Sonos speakers; Polk lacks smart‑assistant support.
Warranty & support
Both provide a 1‑year limited warranty.
Power & efficiency
Polk’s lower weight and inclusion of a subwoofer suggest lower overall power draw; Sonos power specs not provided.
Choose Polk Audio Signa S4 if…
Budget‑focused home‑theater fans who want immediate Dolby Atmos with built‑in subwoofer.
Choose Sonos Arc Ultra if…
Audiophiles and smart‑home users willing to pay premium for higher‑resolution sound and ecosystem integration.
Common questions
Is a subwoofer included?
Polk includes a wireless subwoofer; Sonos does not and requires a separate purchase.
Can I control it with voice assistants?
Sonos supports Alexa and Google Assistant; Polk has no built‑in smart‑assistant integration.
What’s the price difference?
Polk costs $399 MSRP, while Sonos is $899 MSRP, a $500 gap.