Polk Audio Signa S4 Complete Review and Specifications

| Updated: August 3, 2023 | Posted: | ,

The new Polk Audio Signa S4 soundbar is the first of its kind to feature Dolby Atmos support, and it also offers several other features that make it one of the best sounding soundbars on the market today.

The Polk Audio Signa S2 was our previous pick for Best Overall Soundbar under $300, but we’ve decided to upgrade to the Signa S4 because it has some significant improvements over the original model. Read on to find out why!

Polk Signa S4 Review

Polk Signa S4 Features

Dolby Atmos Support: The Polk Audio Signa S4 supports Dolby Atmos technology, which allows you to place sounds anywhere in your room using 3-dimensional spatial audio.

This means that when you watch movies or listen to music, the sound will be able to move around the room as well as up and down. It’s like having surround speakers in every corner of your home.

TrueHD & DTS-HD Master Audio: The Polk Signa S4 comes with both HD and lossless formats from all major movie studios. You can playback Blu-ray discs at full bitrate (24/96) and high-quality MP3 files.

HDMI ARC: The Polk Signa S2 had an analog input for connecting older TVs, but the S4 now includes a digital optical output so you can connect directly to most modern TVs without needing any additional adapters.

Bluetooth Streaming: The S4 supports wireless streaming via Bluetooth, allowing you to stream music wirelessly from your smartphone, tablet, laptop, or computer.

WiFi Connectivity: The Signa S3 included WiFi connectivity, but the S4 adds 802.11ac WiFI for faster speeds.

USB Port: The S4 has a USB port for charging mobile devices or adding external storage.

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Remote Control: The remote control for the Signa S4 is similar to those found on other Polk products. It has buttons for volume adjustment, power on/off, and changing inputs.

Dimming Volume Controls: The volume controls are easy to use and have dimmable LED lights that let you adjust the volume while watching TV.

The new Polk AudioSigna S4 soundbar delivers exceptional performance and looks great in any living space. With advanced technologies such as Dolby Atmos, TrueHD, and DTS-HD master audio, this soundbar lets you enjoy premium audio experiences wherever you want them.

Polk Audio Signa S4 Review - Voice Adjust

With the addition of Dolby Atmos support to the Signa S series, you can experience true three-dimensional sound by placing sounds anywhere in your room.

When playing movies or listening to music, the sound moves around the room just like in real life. This makes the Signa S4 perfect for enjoying movies and music in rooms where traditional stereo systems don’t work as well.

Must read: Best Soundbar Under $400

With HDMI ARC, the Signa S4 can send uncompressed video signals through HDMI cables to display content on compatible televisions. No need to buy separate AVR receivers anymore. Simply plug the soundbar into your TV’s AV input and start enjoying movies and music right away.

The Polk Audio Signa S4 is equipped with two built-in amplifiers, each delivering 50W per channel.

This ensures excellent sound quality even if you’re watching movies or listening to music with low volumes. And since there are no extra wires required, you won’t have to worry about tripping over cords.

Signa S4 Wireless Subwoofer
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The Signa 4 also offers a variety of connections including a pair of RCA outputs, one set of speaker terminals, a single line-level input, a USB port, and a front-panel headphone jack.

This model is designed to fit into smaller spaces and features a sleek black finish.

Also Read: Best Soundbar under $500

How does it sound?

The Signa S series soundbars offer superior audio performance thanks to their powerful amplification system and dual satellite speakers.

The result is a rich, clear sound that fills every corner of your home. It offers a dedicated center channel, true 3D surround sound for an immersive audio experience.


  • Easy setup
  • Simple design
  • Great sound quality


  • Not ideal for large rooms


BrandPolk Audio
ModelSigna S4
Release Year2021
Sound Bar:41.2 x 3.7 x 2.4 inch (104.6 x 9.5 x 6.0 cm)
Subwoofer:7.9 x 12.9 x 11.0 inch (20.0 x 32.8 x 28.0 cm)
Sound Bar
L/R Tweeter(2) 1 inch / 25mm (Round)
L/R Mid(2) 4.7 x 1.6 inch / 120mm x 40mm (Racetrack)
Full Range Center(1) 1 inch / 25mm (Round)
L/R Elevation(2) 2.6 inch / 66mm (Round)
Woofer(1) 5.9 inch / 15 cm (Round)
Optical Input1
3.5 mm input1
In the Box
Sound Bar
AAA Batteries2
HDMI Cable
Optical Cable
Quick Start Guide
Registration Card
Remote Control
Safety Card
Sound Bar Power Cord
Subwoofer Power Cord
Wall Mount Spacers
Wall Mount Template
Dolby Atmos
Wireless Subwoofer
Voice Adjust
Optimized Sound Modes
Height Channels
Discrete Center Channel
Sound Stage
Easy Setup


If you want a high-quality soundbar that will look good in any room, then the Polk Audio Signa S Series is worth checking out. It comes with everything you need to get started right out of the box.

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Frequently Asked Questions

Does Signa S4 have Wireless Subwoofer?

Yes, Polk Signa S4 has Wireless Subwoofer for clutter-free music.

Where can I download the manual?

You can download the manual by clicking here.

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About Richard

Richard is a creative with deep experience in music and audio. He plays several instruments, composes evocative scores, and has worked as an audio engineer for over 15 years. Before founding ColorViewfinder, he supported audio projects for large corporations. Richard is an audiophile passionate about the latest sound technology. His goal is to create the best possible audio experience for the audience.