Sonos Sub Mini Review: Compact Bass for Sonos Soundbars

Who Should Buy It

Key Specifications

Overview

The Sonos Sub Mini is a compact wireless subwoofer designed to add deeper low end to the Sonos Beam, Ray, and Arc Ultra soundbars. The listing positions it as an upgrade for owners of those slim soundbars who want more impact from movies, shows, and games. It uses a lower mid-range price tier, which places it below Sonos' larger flagship subwoofer but above many entry level generic subs.

The product listing emphasizes a sealed cabinet with dual custom woofers that face inward. This force canceling design is intended to reduce cabinet vibration and distortion. Sonos also includes Trueplay tuning, which adapts the bass output to the room using a supported iOS device.

Because this is a wireless subwoofer built for the Sonos ecosystem, it is not a standalone powered subwoofer with line inputs. The listing does not state exact dimensions, weight, frequency response, or power output, so this review focuses on the published design and feature set.

Sound Quality

The published driver design is the core of the Sub Mini's sound story. Two 6 inch woofers sit inside an acoustically sealed enclosure, and they are mounted facing each other to create a force canceling effect. This approach reduces mechanical vibration and distortion, which can help bass stay cleaner at higher volumes. The listing claims the cabinet produces low frequencies of a much larger subwoofer.

Trueplay tuning is another key part of the sound quality equation. The system uses the microphone on a supported iOS device to measure how bass reflects and builds up in the room, then adjusts the output. The listing says this prevents harsh, muddy, or flat bass even when the subwoofer is placed against a wall.

The listing does not publish a frequency response range, so it is impossible to say exactly how deep the Sub Mini reaches. Based on the dual 6 inch drivers and sealed design, buyers should expect solid mid bass and moderate low bass extension, but not the subterranean rumble of a much larger ported subwoofer. In a compact room this is usually enough to add convincing weight to soundtracks and games.

Drivers, Power and Room Fit

The Sub Mini uses two custom 6 inch woofers inside a sealed cabinet. Each woofer faces inward, and the resulting force canceling effect reduces the transfer of vibration to the floor and walls. The listing does not state the amplifier power or sensitivity, so the real world output level is not known from the published material.

Room fit benefits from the compact design and Trueplay. Even with an unspecified maximum output, the sealed cabinet is likely to perform well in small to medium rooms where a larger subwoofer would be visually dominant. The listing suggests placement near a wall is acceptable because Trueplay compensates for boundary reinforcement.

The lack of a published power rating is a common gap for lifestyle audio brands, but it does not necessarily indicate weak bass. The force canceling woofers and advanced processing are meant to maximize output from a small box. Listeners with very large open plan spaces may still need a bigger sub, but for typical living rooms the Sub Mini should be adequate on paper.

Features and Connectivity

Connectivity is entirely wireless and tied to the Sonos ecosystem. The listing states the Sub Mini works with Sonos Beam, Ray, and Arc Ultra, and it uses WiFi for communication. There is no mention of Bluetooth, line level inputs, or speaker level inputs, so it cannot be used with a non Sonos receiver or amplifier.

Trueplay tuning requires a supported iOS device, which is a notable requirement. Android users will not be able to run the Trueplay calibration, though the subwoofer will still function with the Sonos app for basic setup. The listing does not mention any other streaming features, as this product is a subwoofer, not a standalone speaker.

• Dual 6 inch force canceling woofers in a sealed cabinet
• WiFi connectivity with Sonos Beam, Ray, and Arc Ultra
• Trueplay room tuning with supported iOS device
• No wired inputs or Bluetooth listed

Build, Design and Finish

The Sub Mini is described as compact, and the name Mini suggests a smaller footprint than the full size Sonos Sub. The listing does not provide exact dimensions, weight, or finish details. From the product type, it is a cylindrical or rounded cabinet that houses the two inward facing woofers.

The acoustically sealed cabinet is a deliberate design choice. Sealed designs often have a tighter, more controlled bass character than ported designs, and they are less sensitive to placement quirks. However, sealed cabinets typically need more power to reach the same low frequency output as a ported box, which is likely why Sonos pairs the drivers with advanced processing.

The lack of published finish and weight information means buyers cannot know if it matches their exact room decor until it arrives. Sonos products usually have a clean, minimalist look, and the Sub Mini likely follows that family style, but this review cannot confirm the specific material or color from the listing.

Setup and Placement

Setup is designed to be simple for existing Sonos users. The Sub Mini connects to the same WiFi network and is added through the Sonos app. The listing does not describe the exact pairing process, but Sonos subwoofers typically appear as an option once the soundbar is connected.

Trueplay tuning adds a step for iOS users. The app walks through a room measurement process using the phone's microphone. This step is optional but recommended, especially if the subwoofer is placed near a wall or in a corner.

Placement flexibility is a selling point. The force canceling design reduces vibration, and Trueplay adjusts for boundary effects, so the Sub Mini can sit against a wall or beside furniture without sounding overly boomy. That said, the listing does not state a recommended minimum distance from walls.

Daily Use

In daily use, the Sub Mini should operate invisibly. Once paired, the Sonos system likely handles volume matching and crossover blending automatically, so users do not need to tweak settings repeatedly. The subwoofer is designed to enhance low frequencies without drawing attention to itself.

One daily use consideration is the iOS requirement for Trueplay. If an Android user wants to recalibrate after moving the subwoofer, they will not have that tool. The subwoofer will still work, but the room correction feature is unavailable to them.

Another consideration is the Sonos ecosystem lock in. The Sub Mini cannot be used with a non Sonos receiver, stereo amplifier, or soundbar from another brand. This is fine for loyal Sonos owners, but it limits flexibility if the user later changes their main system.

Who Should Buy It

The Sonos Sub Mini is best for existing owners of a Sonos Beam, Ray, or Arc Ultra who find the bass thin or want more impact from movies and games. It is especially useful in smaller rooms where a full size subwoofer would be overpowering or take up too much space.

It is also a good choice for people who value seamless wireless integration and are willing to stay within the Sonos app. The Trueplay feature adds a level of room correction that is rare at this price tier, provided the user has an iOS device.

Buyers who already have a Sonos soundbar and are considering a subwoofer should look at the Sub Mini before the larger Sonos Sub, as the Mini is likely more than enough for most apartment and small living room setups.

Alternatives Worth Considering

The most direct alternative within the Sonos family is the larger Sonos Sub, which costs more and delivers deeper, more powerful bass for larger rooms. The listing does not provide comparative specs, so buyers should rely on room size and listening expectations.

Outside the Sonos ecosystem, traditional powered subwoofers from brands like SVS or Klipsch offer wired connections and often publish full specifications including frequency response and amplifier power. These subs can be used with any receiver or soundbar that has a subwoofer output, but they lack the wireless simplicity of the Sub Mini.

For buyers who want a wireless subwoofer but do not use Sonos, there are few direct competitors that offer the same level of integration with a specific soundbar family. Some soundbar packages from other brands include their own wireless subs, but cross compatibility is rare. The Sub Mini is really only a sensible choice inside the Sonos world.

Verdict

The Sonos Sub Mini is a well executed compact subwoofer for the Sonos ecosystem. Its dual 6 inch force canceling woofers and sealed cabinet are designed to produce clean, controlled bass without the bulk of a traditional sub. Trueplay tuning further refines the sound for the room, which is a meaningful benefit.

The main drawbacks are the lack of published specifications and the strict requirement of a compatible Sonos soundbar. The listing does not state frequency response, power, dimensions, or weight, so some buyers may hesitate. However, the design philosophy is sound, and the lower mid-range price makes it an accessible upgrade.

Overall, the Sub Mini earns a score of 76 out of 100. It offers strong sound quality for its size and seamless integration, but it loses points for limited ecosystem compatibility and missing spec transparency. For the right user, it is an easy recommendation.

Strengths and Limitations

Alternatives to Consider

Audioengine A5 Plus

Buyers who want a powered Bluetooth bookshelf speaker pair with a turntable friendly analog input and room to add a subwoofer later.

Read the Audioengine A5 Plus review →

ELAC Debut DB63-W

Listeners building or upgrading a passive two channel music system who want a known speaker brand at a lower mid-range price.

Read the ELAC Debut DB63-W review →

Sonos Move 2

A buyer who wants one weather resistant portable speaker that moves between home WiFi streaming and outdoor Bluetooth use with long battery life.

Read the Sonos Move 2 review →

Questions Buyers Ask