Small Sonos sub, big bass: worth it at £339?

Is the Sonos SUB MINI BLACK Wireless Subwoofer worth buying? Yes — if you own a compatible Sonos speaker or soundbar and want deeper bass at its current all-time-low price of £339.00. It has a strong 4.7/5 rating from 440 reviews, and the fact it’s 21% off the £429 RRP makes this the most attractive time to buy.

First impressions: compact, discreet, and very Sonos

At first glance, the Sub Mini is designed to disappear rather than dominate a room. The cylindrical black cabinet is meant to sit neatly under furniture or blend into a living space, which matters if you want proper low-end weight without a giant box on show. Sonos has clearly aimed this at people who want a cleaner, more elegant setup than a traditional subwoofer.

The real appeal is how simple it is to add. The setup is described as quick: plug in the power cable, open the Sonos app, and wirelessly connect it to a compatible soundbar or speaker. That includes Sonos Beam, Ray, Era 100, One, and One SL. For a home cinema or music system, that ease of integration is a major part of the value.

What makes the Sub Mini different?

The key hardware story is the use of dual custom woofers paired with advanced processing. Sonos says this generates a deep, dynamic low end, and the design is not just about output — it’s about control. The acoustically sealed cabinet and inward-facing woofers create a force-cancelling effect to reduce distortion, buzz, and rattle.

That matters because subwoofers can easily become boomy or sloppy in smaller rooms. Sonos is clearly trying to avoid that with Trueplay tuning, which adapts bass to the room’s acoustics so it doesn’t sound harsh, muddy, or flat. In practical terms, that should make the Sub Mini easier to live with in typical UK homes where space is limited and rooms are not acoustically perfect.

How does it perform for TV and music?

For TV and film, the Sub Mini’s job is to add scale, weight, and impact to a system that may already sound clear but lacks physical low-end presence. If you pair it with a Beam or Ray, the improvement should be most obvious in action scenes, music-heavy shows, and cinematic soundtracks where bass gives the whole presentation more authority.

For music, the benefit is less about brute force and more about filling out the bottom octave so tracks feel fuller and more immersive. The product positioning suggests it is aimed at users who want their Sonos speakers to sound more complete rather than simply louder. That said, this is still a compact subwoofer, so buyers expecting room-shaking bass from a tiny enclosure should keep expectations realistic.

Build quality and design

Sonos has a strong reputation for industrial design, and the Sub Mini fits that pattern. The sealed cylindrical form is practical as well as attractive, and the force-cancelling layout should help keep unwanted vibration under control. There are no listed amplifier wattage figures, frequency response numbers, or THD measurements in the supplied data, so the review has to judge it on design intent and user response rather than lab-style specifications.

The 4.7/5 average from 440 reviews suggests the execution is largely successful. With 100+ bought last month, it is also moving at a healthy pace for a premium accessory, and the #1602 sales rank shows it sits in a competitive but established part of the subwoofer category.

Is it good value for money at £339?

At £339.00, the Sub Mini is not cheap, but it is currently at its all-time lowest price, which makes the timing unusually favourable. Against the £429 RRP, the saving is £90, or 21% off. That is meaningful for a Sonos accessory, especially one designed to upgrade an existing system rather than replace it.

Compared with alternatives in the provided lineup, the pricing context is interesting. The WiiM Amp costs £319 and scores 4.4★, but it is a different product category entirely: a streaming amplifier rather than a dedicated subwoofer. The Sonos Beam (Gen 2) is £349 and rated 4.6★, so the Sub Mini sits just below it in price while serving a more specialised role. The Sonos Era 100 is £199 and rated 4.4★, but again it’s a speaker, not a bass-expansion product. If you already own compatible Sonos hardware, the Sub Mini is the more targeted upgrade.

What should buyers watch out for?

The biggest warning is compatibility: this only makes sense if you already use, or plan to use, a supported Sonos system. It is not a universal subwoofer for mixed-brand setups. Also, the product data here includes no technical measurements such as frequency response, output wattage, or driver size, so buyers who want hard engineering figures may find the Sonos marketing-style description a little light on detail.

Final take

The Sonos Sub Mini is a well-executed, easy-to-live-with wireless subwoofer that adds genuine depth to compatible Sonos systems. At £339.00 — the all-time low — it is much easier to recommend than at full RRP, especially given its 4.7/5 score from 440 reviews. If you want cleaner, fuller bass for TV and music without a bulky subwoofer, this is an appealing upgrade; if you need maximum slam per pound or use non-Sonos gear, look elsewhere.