The Polk Signa S4 pairs a low-profile soundbar with a separate wireless subwoofer for a compact home cinema system. Its 3.1.2-channel layout uses a dedicated centre channel for dialogue and upward-firing speakers for Dolby Atmos height effects. The soundbar has seven drivers, with a separate bass driver in the subwoofer.

VoiceAdjust lets you bring speech forward, while Bass Adjust changes the low-frequency balance. Movie, Music and Night listening modes make it easy to adapt the system to films, everyday music or quieter late viewing. Connect a compatible television through HDMI eARC for Dolby Atmos; an optical input and a 3.5mm analogue input support other audio sources. The HDMI connection is the TV audio-return connection, rather than an additional HDMI source input or video pass-through.

Bluetooth lets a compatible phone or tablet stream music directly to the system. The wireless connection between soundbar and subwoofer reduces the audio cabling between them; both still require mains power. The soundbar can sit below a TV or be wall mounted following the manufacturer’s instructions. Its cabinet measures 1046×95×60mm (width×depth×height), and the subwoofer measures 200×328×280mm.

This Black Signa S4 offer includes one soundbar, one wireless subwoofer, remote control with two AAA batteries, power cabling, HDMI and optical cables, quick-start guide, wall-mount template and spacers. A television, external source devices and other room furnishings are not included. Dolby Atmos playback requires compatible content, equipment and the appropriate HDMI eARC connection; the USB-A connection is for firmware updates.