What the Sub 4 adds to your Sonos system
- Amazon price
- $749.00
- Customer rating
- 4.7
- Customer reviews
- 552
- Typical price over 90 days
- $863.80
- Difference
- $114.80 (13 percent)
The Sonos Sub 4 handles the low frequencies your soundbar can't reach. Two Sonos-engineered drivers sit in a ported enclosure, so movie effects, bass lines and game audio carry more weight.
If you own a Sonos Arc Ultra, Arc or Beam, we'd consider this the upgrade that changes what you feel in the room. Without one of those, the Sub 4 has nothing to connect to, so we'd skip it.
How the Sub 4 connects and where it can sit
Setup is one power cable and the Sonos app. The Sub 4 joins your system over WiFi, so you don't need to run a cable back to the soundbar. That matters if your seating or furniture rules out a wired subwoofer.
The cabinet works upright or on its side, which opens spots like the space under a sofa. Two force-canceling drivers work against each other to reduce the rattle and buzz that reveal where a sub sits. You can pair two with an Arc Ultra or Arc if you want more output.
Check your planned spot before buying, because the app handles pairing but won't fix a position that blocks the port or drivers.
Which rooms justify $749.00, and which don't
At $749.00, the Sub 4 suits a dedicated movie or gaming room where low-end effects should land with force. The ported design and dual drivers give you that output, and the updated matte finish fits the look of the rest of the Sonos line.
At $749.00, it sits below the typical price of $863.80 seen over the last 90 days, so this is a sensible moment to add it if the soundbar is already in place. Owner reviews are plentiful, which makes the overall picture worth weighing alongside your own room.
Our advice is to skip it in a small bedroom or if you mostly watch dialogue-driven TV. The bass won't have room to work, and $749.00 is a lot for a change you won't notice.
Confirm your soundbar is an Arc Ultra, Arc or Beam before ordering, since the Sub 4 pairs with those and not with non-Sonos gear.
Decide upright or on its side first, then measure the gap, because the sub needs airflow around the port and drivers.
If you want two subs for Arc Ultra or Arc, check that the app supports a second unit in your setup before buying the pair.
Spec sheet
| Model | SUBG4US1BLK |
|---|---|
| Color | Black |



