Polk Signa S4 review

Signa S4 gives you the two things this list is about, clearer voices and fuller sound, for less than any Sonos or Bose Atmos bar. Polk's VoiceAdjust technology is designed to make dialogue clear and easy to understand while leaving the rest of the soundtrack alone, and Night Mode lowers the bass while raising VoiceAdjust with one button. The 3.1.2 layout includes a center channel and two up-firing height speakers, and the wireless subwoofer delivers bass a single bar cannot. BassAdjust balances the bar and sub together. Setup is one cable, with HDMI eARC or ARC, optical or aux, and Polk says it is pre-programmed for most TV remotes. Bluetooth handles music from your phone. The trade-offs: Atmos height effects need an HDMI eARC connection, there is no WiFi streaming, and the subwoofer is one more box in the room. At $449 it is the value pick for fuller sound.

Who it is for

Buyers who want Atmos height and real subwoofer bass in one box for under $500.

Price

$449 on the Polk Audio US store.

Signa S4 Dolby Atmos 3.1.2 Sound Bar with Wireless Subwoofer $449
Quoted from the vendor pricing page on November 8, 2026.

Key features

• Dolby Atmos 3.1.2 with up-firing height speakers
• Wireless subwoofer included, with BassAdjust
• VoiceAdjust technology for clearer dialogue
• Movie, Music and Night modes
• Connects by HDMI eARC or ARC, optical or aux, plus Bluetooth

Strengths and weaknesses

• Strength: The only pick under $500 here with a separate wireless subwoofer
• Strength: Night Mode lowers bass and raises VoiceAdjust in one press
• Strength: Pre-programmed to work with most TV remotes
• Weakness: No WiFi music streaming listed
• Weakness: 41.2 inch bar plus a subwoofer takes more space
• Weakness: Atmos height needs an HDMI eARC connection

Key facts

• Price: $449
• Channels: 3.1.2
• Subwoofer: Wireless, included
• Size: 41.2 x 3.7 x 2.4 in

Where it ranks

Polk Signa S4 is No. 4 in our Best Soundbars verdict.