Sonos Sub Gen 4 Wireless Subwoofer (White)

Sonos Sub Gen 4 Wireless Subwoofer (White)

The Sonos Sub (Gen 4), finished here in white with a matte finish, is Sonos’s full-size wireless subwoofer, designed to add low-frequency weight to a compatible Sonos soundbar or speaker system. Inside its ported cabinet, two 5 x 8-inch elliptical woofers face inward towards each other, a force-cancelling arrangement intended to keep the cabinet still and virtually eliminate distortion while the drivers work hard. Each woofer is driven by its own Class-D digital amplifier, tuned to the subwoofer’s acoustic architecture. Sonos rates the frequency response as low as 25 Hz, which reaches the deep bass region that soundbars and compact speakers physically cannot reproduce. The Sub (Gen 4) is not a standalone product: it pairs over WiFi with a compatible amplified, non-portable Sonos product and becomes part of that room’s system.

Key features

• Dual force-cancelling woofers: Two 5 x 8-inch elliptical woofers face inward, cancelling cabinet vibration while producing deep, controlled bass.
• Response down to 25 Hz: Low-frequency extension as low as 25 Hz adds the foundation that film effects and bass-heavy music require.
• Dual Class-D amplifiers: Two digital amplifiers, each perfectly tuned to the subwoofer’s unique acoustic architecture and drivers.
• Trueplay tuning: Trueplay measures the acoustics of the room and fine-tunes the system, while automatic EQ balances the Sub with its paired speakers.
• WiFi 6 connectivity: Connects to 802.11a/b/g/n/ac/ax routers on 2.4 and 5 GHz bands, with a 10/100 Ethernet port available for a wired connection.
• Stand it or lay it flat: The design works standing upright or lying on its side, so it can be placed beside furniture or slid underneath it.
• Dual Sub option: A second compatible Sonos subwoofer can be added to a home theatre setup for deeper, more even bass.
• Matte white finish: This listing is for the white version, with a matte finish intended to sit comfortably in lighter modern interiors.

Compatibility and system role

Sonos lists compatibility with its amplified, non-portable products, including Arc Ultra, Arc, Beam in both generations, Ray, Five, Era 300, Era 100 and Amp. In a home theatre, the Sub takes over the lowest frequencies from the soundbar, which both deepens the bass and frees the soundbar’s smaller drivers from attempting notes they reproduce poorly — dialogue clarity and midrange openness often improve as a result. In a music system built around Era or Five speakers, it extends the system to genuinely full range. Settings automatically equalise to balance the Sub with the paired speakers, and bass, treble and loudness can be adjusted in the Sonos app.

Hardware and placement

The Gen 4 hardware includes a quad-core 4xA55 processor at 1.9 GHz, 512 MB of DDR4 memory and 4 GB of storage, supporting current software and future updates. The cabinet measures 389 x 402 x 158 mm and weighs 11.79 kg. Placement is flexible because the connection to the system is wireless: the Sub needs a power outlet — its internal supply accepts 100 to 240V at 50/60 Hz — but no audio cable to the soundbar. Acoustic results still depend on position, since room boundaries reinforce bass unevenly, so trying more than one spot and then running Trueplay is the sensible setup routine. A join button on the unit adds it to the system during setup.

Requirements

Using the Sub (Gen 4) requires a home WiFi network with an internet connection, a power source, the latest Sonos app on a compatible device and a compatible Sonos product to pair with. Operating temperature is rated from 0 to 40 degrees Celsius. The package includes the Sub itself, a 2-metre power cable and documentation.

For a Sonos system that sounds good but feels lightweight, the Sub (Gen 4) in white addresses the physical missing piece: real low-frequency output, produced by purpose-built drivers and amplification, integrated and room-tuned through the Sonos platform itself.