The Polk Audio Signa S4 is a 3.1.2-channel soundbar from Polk Audio, listed at $449. It ships with a wireless subwoofer, so the price covers the bass as well as the bar.
Polk Audio Signa S4 Pros and Cons
Drawn from the published figures on this page, not from listening.
- ✓Dedicated height channels (3.1.2) for Dolby Atmos, not only virtual processing
- ✓A dedicated centre channel for dialogue
- ✓Subwoofer included in the box
- ✓HDMI eARC carries lossless Dolby TrueHD and Atmos from the TV
- ✓HDMI input - a spare port for a console or player
- ✓Dialogue enhancement and a night mode
- ✓Learns your TV remote
- ✗No DTS:X, so DTS soundtracks play without their height layer
- ✗No rear speaker option, so surround stays virtual
- ✗No Wi-Fi - music streams over Bluetooth only
Channels and Surround Sound
The 3.1.2 badge means 3 ear-level channels (left, centre and right), 1 subwoofer channel, 2 height channels firing at the ceiling. It decodes Dolby Atmos. Virtual surround: Movie Mode.
Subwoofer, Rear Speakers and Mounting
A wireless subwoofer is included, measuring 7.88 x 12.94 x 12.81 in (W x H x D). It cannot add rear speakers. Wall-mountable: Yes (no bracket supplied).
Connections
The Polk Audio Signa S4 has HDMI eARC to the TV - the connection that carries lossless Dolby TrueHD and Atmos from the TV's own apps and inputs; 1 HDMI input (HDMI 2.1); optical digital input; 3.5mm analogue input.
Streaming, Control and Sound Modes
No Wi-Fi; Bluetooth; a remote in the box. Sound features: dialogue enhancement, night mode, learns the TV remote.
Size and Which TV It Suits
The bar measures 41.13 x 2.5 x 3.81 in (W x H x D), or 1045 x 64 x 97 mm. It is no wider than the screen of a 50-inch TV (43.6 in wide) or larger, which is where a soundbar looks in proportion. At 2.5 in tall it should clear the bottom of most TVs sitting on their own feet.
Open the soundbar size simulator to try another TV or compare two bars.
Polk Audio Signa S4 Specifications
| Sound |
|---|
| Channels | 3.1.2 |
| Dolby Atmos | Yes |
| DTS:X | No |
| Drivers | Tweeters: 1" Dome (3); Midrange: 2.625" Height Drivers (2); Woofers: 4.75"x1.5" Cone (2); Subwoofer: 5.9375" Cone; Enclosure: Ported |
| Subwoofer | Included |
| Rear speakers | None |
| Virtual surround | Movie Mode |
| Dialogue enhancement | Yes |
| Night mode | Yes |
| Room correction | No |
| Connections |
|---|
| HDMI to TV | eARC |
| HDMI inputs | 1 |
| HDMI version | 2.1 |
| Optical inputs | Yes |
| Analogue input | 3.5mm |
| USB | No |
| Subwoofer output | Wireless |
| HDMI CEC | Yes |
| Streaming and Control |
|---|
| Wi-Fi | No |
| Bluetooth | Yes |
| Voice control | No |
| Remote included | Yes |
| Learns TV remote | Yes |
| Physical |
|---|
| Dimensions (W x H x D) | 41.13 x 2.5 x 3.81 in / 1045 x 64 x 97 mm |
| Subwoofer size | 7.88 x 12.94 x 12.81 in (W x H x D) |
| Wall mounting | Yes (no bracket supplied) |
| Warranty | 1 Year parts, 1 Year labour |
| List price | $449 |
Power is the maker's total across all drivers and is not comparable to an amplifier's per-channel rating.