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Polk Audio Signa S4 Soundbar Offers Dolby Atmos

Polk Audio makes great speakers and soundbars, but until now they haven’t released a sound bar with Dolby Atmos. However, their new Signa S4 solves that problem at a reasonable price.

Polk Audio Signa S4 Soundbar and Wireless Subwoofer Lifestyle

Although Polk Audio has a reputation for making great speakers and soundbars, the new Polk Audio Signa S4 is their first soundbar to include Dolby Atmos. Let’s check out its features and see if it is the right soundbar to improve your TV listening experience. 

Polk Audio Signa S4 Soundbar and Wireless Subwoofer Angle

What the Polk Audio Signa S4 Offers

Product Design: The Signa S4 fits below most TVs without obstructing the screen. It can also be wall-mounted with the purchase of an additional wall-mounting kit. 

Soundbar Dimensions (W x D x H): 41.2 x 3.7 x 2.4 inches (1046 x 95 x 60mm)

Speaker Complement: The soundbar houses five horizontal facing speakers and two vertically firing speakers for a total of seven.

Dolby Atmos: The Signa S4’s two upward-firing speakers deliver Dolby Atmos height channels that create overhead sound, for experiencing Dolby Atmos-encoded movies, immersive Dolby Atmos music, or gaming. The Signa S4 can also up-mix non-Atmos rendering height, surround, and center channels to create a virtual Atmos experience.

VoiceAdjust™: The dedicated center channel speaker in the Signa S4 is paired with Polk’s patented VoiceAdjust™technology. Using this feature improves dialogue presence without affecting the other channels. This is great for improved listening with movies, and sporting events, and when viewing at lower volumes, such as nighttime. 

Voice Adjust Promotional Video

Wireless Subwoofer: The Signa S4 includes a ported down-firing wireless subwoofer with a 6-inch driver. The subwoofer connects wirelessly to the sound bar automatically on start-up and can be conveniently placed nearly anywhere in the room (within 33ft/10m where bass response is best. 

Polk Audio Signa S4 Wireless Subwoofer

Bass Adjust: For added bass flexibility the Signa S4 includes the Bass Adjust feature. This controls the low-frequency output on both the sound bar and subwoofer, generating an optimized blend and maximum impact at any desired level.

Sound Modes: In addition to VoiceAdjust and Bass Adjust, the Signa S4 also provides Sound Mode/EQ presets for Movie, Music, and Night Listening (Night Mode). The Night Mode automatically attenuates bass output and dialogue clarity to avoid disturbing sleeping neighbors or family members during late-night binge-watching sessions.

Setup: The Signa S4 is easy to set up and use. With the included HDMI or optical cable (or aux-in for older TVs), the sound bar is ready to deliver a satisfying listening experience with even the latest 8K Ultra-HD TVs. Built-in HDMI eARC can pass through eight channels of uncompressed audio, delivering sonic excellence. 

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Tip: HDMI and Digital Optical cable included.

Control: The Signa S4 comes with wireless remote control, and is also pre-programmed to work with most TV remotes. 

Polk Audio Signa S4 Soundbar Remote

In addition, the Signa S4 has onboard control buttons for power, input selection, Bluetooth pairing, and volume. 

Polk Audio Signa S4 Soundbar Top Buttons


(1) HDMI (ARC/eARC) output,

(1) Digital optical input

(1) Analog 3.5mm input (Aux)

(1) USB-A (for firmware updates and service only)

Polk Audio Signa S4 Soundbar Rear Connections

Bluetooth is also included for streaming music from compatible devices, such as smartphones.

What Comes in the Box

• Sound bar

• Subwoofer

• Remote control

• Power cord

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• HDMI cable

• Digital Optical cable

• 2x AAA batteries

• Quick Start Guide

• Wall-mount template

• Wall-mount spacers

Pricing and Availability 

The Signa S4 is available now, direct from or through authorized Polk dealers for an MSRP of $399 (U.S.).

Related reading: Best Soundbars

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