1% for the Planet

Black Sonos Sub 4 turned at a slight angle

Front of a black Sonos Sub 4, straight-on angle

A Sub 4 next to a couch in a living room, being used with an Arc Ultra

Straight-on view of a black Sub 4, turned at a slight angle

Left side of a black Sub 4 and the sync button

A black Sub 4 against a wall next to a table being used with a black Sonos Five

Back of a black Sonos Sub 4, straight-on angle

Bottom of a black Sub 4 and the power cord receptacle

Refurbished Sub 4

$619

$719

Save $100

4.9/5

Sub 4 unlocks the full power of Sonos sound to immerse you deeper in every scene and song.

More info

Features

Dual orientation

WiFi

Two Sonos employees inspecting recyclable Sonos packaging

A sound choice for a more sustainable future

The Sonos Certified Refurbished program is key to our sustainability efforts, helping minimize waste and extend the life of our products.

Sustainability at Sonos

Serviceability

We're designing products that are easier to disassemble so they can be more efficiently repaired and reused.

Circularity

By incorporating recycled materials in new products and refurbishing existing ones, we're amplifying a circular economy.

Recyclability

We're eliminating plastic from our packaging in favor of paper that's responsibly sourced and completely recyclable.

You shop, we donate

We donate 1% of Certified Refurbished sales to high-impact nonprofits focused on environmental preservation and restoration, including Rainforest Connection.

A member of a rainforest conservation crew examining a tree in the rainforest

Certified Sonos quality

Every refurbished product undergoes thorough testing to guarantee it's good as new and includes:

The same one-year warranty as a brand new product

All accessories, manuals, and other documentation

Pristine packaging and necessary replacement parts

Tech Specs

Amplifiers

Dual Class-D digital amplifiers perfectly tuned to the subwoofer's unique acoustic architecture.

Woofers

Dual 5" x 8" elliptical woofers face inward for a force-canceling effect that virtually eliminates distortion.

Architecture

Ported cabinet enhances bass response.

Frequency Response

As low as 25 Hz

Audio settings automatically equalize to balance Sub 4 and the paired Sonos speaker(s). Use the Sonos app to adjust bass, treble, and loudness.

Trueplay

This software measures the acoustics of the room then fine-tunes your Sonos system.

Learn more

FAQ

Product Guide