Let’s address the elephant in the room: the Sonos Sub Gen 3 costs $799. That’s more than most people spend on an entire soundbar system. So why would anyone buy it? After living with one for three months, I finally get it.
The Sub Gen 3 isn’t trying to be the loudest or deepest subwoofer. It’s trying to be the most seamless. And in that specific mission, it succeeds brilliantly.
Setup: Almost Disappointingly Easy
You open the Sonos app. You tap “Add Product.” The sub finds your existing Sonos system within seconds. That’s it. No cables except power. No receiver configuration. No crossover dials to fiddle with. For someone who’s spent hours calibrating traditional subs, this feels almost like cheating.
The Sub automatically calibrates using your phone’s microphone. Trueplay tuning measures your room’s acoustics and adjusts the EQ accordingly. In my 12×15 foot testing room, the calibration took about 45 seconds. The result was a remarkably balanced bass response that would have taken me 20 minutes to dial in manually with a traditional sub.
Sound: Elegance Over Brutality
Inside the glossy shell sit two force-canceling 6-inch drivers. They face each other to eliminate cabinet vibration — a clever engineering trick that means the Sub stays perfectly still even at high volumes. The result is clean, distortion-free bass that fills the room without calling attention to itself.
For movies, the Sub Gen 3 doesn’t shake your couch like a 15-inch ported sub would. What it does is extend your Sonos soundbar’s range so effortlessly you forget the sub is there. Explosions have weight. Soundtracks have depth. The bass is present and full, never boomy.
For music, the Sub Gen 3 is genuinely excellent. The sealed design (no ports) means tighter, more accurate bass. Kick drums snap. Bass lines are articulate. Electronic music has satisfying heft without overwhelming the mids. This is what good bass integration sounds like.
The caveat: you need a medium or small room. In larger open-plan spaces, the Sub Gen 3 can struggle to pressurize the room. Maximum output is around 100dB at 30Hz — respectable but not earth-shattering.
Is It Worth $799?
If you already own Sonos gear, the answer is an easy yes. The Sub Gen 3 completes the system in a way no other sub can — the wireless integration, Trueplay tuning, and seamless multi-room audio are genuinely unmatched.
If you don’t own Sonos, it’s a tougher sell. For $799, you can get a traditional sub that’ll outperform the Sub Gen 3 on raw output. But you won’t get the convenience, the app integration, or the wife-approved design that disappears into a room.
The Sonos Sub Gen 3 is luxury bass. It’s not the most bang for your buck. It’s the most refined, easiest-to-live-with subwoofer I’ve tested. For the right person, that’s worth every penny.
Rating: 4.5/5 — Flawless wireless integration meets refined, accurate bass.