Direct answer
For the Sonos Sub (Gen 3), selected input, app permission, boom position, Bluetooth call profile and hardware should be separated. First, record locally and compare a call app.
What this covers
- Sonos Sub (Gen 3) (Sub Gen 3)
- Sonos product; Wi-Fi/Ethernet, Bluetooth, voice, home-theater and line-in capabilities vary.
- The specific fault this record addresses: microphone sounds bad or is not detected
What it does not cover
- ×The same symptom on a different Sonos product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The application is using a different microphone
What separates it Callers report poor quality, with the phone's own microphone being used instead of the headset's.
How to confirm Applications keep their own input selection independently of the system default.
- 2
The microphone opening is blocked
What separates it Muffled or quiet voice pickup, with visible debris in the small openings.
How to confirm Clean carefully with a dry soft brush.
- 3
Wind or background noise is overwhelming it
What separates it Poor pickup outdoors or in a noisy environment.
How to confirm Headset microphones are small and close to the body. Noise-reduction processing helps but has limits.
- 4
The application does not have microphone permission
What separates it No input at all in one application while others work.
How to confirm Both phones and computers gate microphone access per application, and the prompt is easy to dismiss.
- 5
The soundbar's far-field microphones are muted
What separates it Voice control not responding, with a mute indicator lit.
How to confirm Most voice-enabled speakers and soundbars have a physical microphone mute, which is easy to press by accident.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Which input device the application itself has selected, as opposed to the system default.
- Whether the problem affects one application or all of them.
- Whether the microphone openings are clear.
- Whether a physical microphone mute is engaged.
Select the headset explicitly as the input in the application
ReversibleApplications keep their own input selection separately from the system default.
Check microphone permission for that specific application
ReversibleAccess is gated per application and the prompt is easy to dismiss by accident.
Clean the microphone openings with a dry soft brush
ReversibleThey are small and collect debris, which muffles pickup.
Check for a physical microphone mute on a speaker or soundbar
ReversibleMost voice-enabled devices have one and it is easy to press without noticing.
Record a short test and listen back before troubleshooting further
ReversibleThis turns second-hand reports of poor quality into something you can actually assess.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- Sub Gen 3. Sonos product; Wi-Fi/Ethernet, Bluetooth, voice, home-theater and line-in capabilities vary.
- Type — wireless subwoofer (mains-powered)
- A mains-powered wireless subwoofer that bonds to a Sonos soundbar or speaker pair over WiFi to add deep bass. It has no battery and no standalone function — it only works bonded to another Sonos product in the app.
- Bonding
- 'No bass / Sub not working' is usually the bonding: confirm the Sub is added to the same room as the soundbar in the Sonos app and is on WiFi. It must be assigned to a soundbar/speaker to do anything.
- Placement & level
- Sub bass is adjustable in the app; a Sub in a corner sounds boomier. If bass seems wrong, run/adjust the level and Trueplay tuning rather than assuming a fault.
- Symptom boundary
- This record covers Sonos Sub (Gen 3) when it microphone sounds bad or is not detected. A different symptom on the same hardware, or this symptom on a different Sonos product line, has its own record with its own causes and its own cited source.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Sonos publishes this as "Sonos Voice Control requests not working". the Sonos article for a microphone that is muted, not detected, or not hearing requests. Probed 2026-08-21: title-verified. What that article does not carry is the model boundary — it is written for a product line, and Sub Gen 3 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
My Sonos Sub isn't producing any bass.+
The Sub only works when bonded to a Sonos soundbar or speaker pair, so first confirm in the Sonos app that it is added to the same room and shows connected. It also needs power and WiFi. If it is bonded and still silent, adjust the Sub level in the app (it may be turned down), check placement (corners boom, open floor is flatter), and re-run Trueplay. A Sub that will not bond at all is usually a WiFi/network issue.
People say I sound distant on calls.+
Check which microphone the application is actually using — applications keep their own input selection independently of the system default, and it is common for a call app to use the laptop or phone's built-in microphone while your headset handles playback. Selecting the headset explicitly as the input usually fixes it immediately.
Does this answer apply to every Sonos model?+
No. It is scoped to Sub Gen 3. Sonos product; Wi-Fi/Ethernet, Bluetooth, voice, home-theater and line-in capabilities vary.
What should I record before troubleshooting microphone or calls?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing microphone, calls. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Protect private recordings and stop for liquid/physical damage.
Answer for the exact device and software version shown above.