If you’ve been looking to elevate your TV’s sound without spending a fortune on a full home theater system, the Polk Audio Signa S4 stands out as one of the most balanced Dolby Atmos soundbars in its class. Polk has long been known for delivering rich, room-filling audio at accessible prices, and the Signa S4 takes that reputation even further — combining immersive 3D sound, deep bass, and intelligent voice clarity in a sleek, easy-to-install package.
Whether you’re watching blockbusters, gaming, or streaming your favorite shows, this 5.1.2-channel soundbar transforms flat TV sound into a true cinematic experience.
- ADVANCED ULTRA-SLIM SOUNDBAR AND WIRELESS SUB – The Signa S4 Dolby Atmos soundbar, 7-driver array, & dedicated full-range center channel deliver 3D surround sound; 5.9″ sub creates WIDE SOUNDSTAGE, DEEP BASS (Waterproof: No)
Design & Build Quality
The Signa S4 sports a minimalist, low-profile design that blends perfectly under modern TVs. Despite its slim body, it hides powerful speaker arrays capable of producing wide, detailed sound. The included wireless subwoofer delivers punchy bass without cable clutter, and setup is effortless — just plug in power and connect via HDMI eARC or optical input.
Polk’s build quality feels premium at this price point, with solid materials and a sleek matte finish that looks elegant in any home theater or living room setup.
Audio Performance
This is where the Signa S4 truly shines. Powered by Dolby Atmos technology, it creates a 3D surround sound bubble that feels like audio is coming from every direction — even above you. Explosion effects, rainfall, or helicopter flyovers sound dramatically more realistic compared to standard soundbars.
The VoiceAdjust™ feature lets you fine-tune dialogue clarity independently from background effects — a major plus for movies or news broadcasts. Meanwhile, BassAdjust™ gives you full control over low frequencies to match your room or preference, from subtle warmth to thunderous depth.
Even at high volumes, the sound remains clear and distortion-free, thanks to Polk’s advanced tuning and 530W peak power output.
Connectivity & Compatibility
The Signa S4 supports HDMI eARC, optical, and Bluetooth connectivity, making it compatible with all major TV brands — from Samsung and LG to Sony and TCL. It also supports 8K video passthrough, ensuring your setup stays future-ready. You can stream directly from smartphones or tablets via Bluetooth, and switching between inputs is simple with the included remote.
Everyday Use
Polk designed this system for plug-and-play simplicity. From unboxing to setup, you’ll be enjoying Dolby Atmos sound in minutes. It automatically syncs with most TV remotes, and its power efficiency and wireless range are impressive. For mixed use — movies, sports, and gaming — it delivers balanced performance without constant audio tweaking.
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Pros and Cons
✔️ Pros
- Immersive Dolby Atmos 3D surround sound
- VoiceAdjust™ & BassAdjust™ enhance clarity and impact
- Wireless subwoofer with deep, clean bass
- HDMI eARC and 8K passthrough support
- Plug-and-play setup and sleek, compact design
❌ Cons
- No Wi-Fi or built-in voice assistant support
- Limited advanced EQ customization compared to high-end AV receivers
Final Verdict
The Polk Audio Signa S4 is a superb choice for anyone who wants to experience cinematic Dolby Atmos sound at an affordable price. It punches well above its price class in clarity, bass performance, and immersive surround depth.
If your goal is to dramatically upgrade your TV audio without dealing with multiple speakers and complex wiring, the Signa S4 is easily one of the best Dolby Atmos soundbars under $400 in 2025.
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