ANC Headphones Not Working: 8 Fixes for Noise Cancellation Problems

Step 1: Confirm ANC Is Actually Enabled

This is more common than it seems.

ANC headphones typically have three modes: ANC on, transparency/aware mode, and ANC off.

Some headphones cycle through these with a single button.

The modes can feel similar, ANC off with good passive isolation can still feel quiet.

Open the companion app (Sony Headphones Connect, Bose Music, Jabra Sound+) and verify that noise cancellation is set to maximum.

Step 2: Check for Blocked External Microphones

The external microphones that sample incoming noise are typically small holes on the outside of the ear cups.

If these are covered, by a tight headphone case, by accessories, or by debris, the ANC system samples incorrect or no noise data and performs poorly.

Inspect the external mic holes with a flashlight.

Clean any debris with a dry soft brush.

Do not use liquids near microphone ports.

Step 3: Verify the Ear Seal

Hold the headphones against your head and press the ear cups in slightly more firmly than normal.

If ANC immediately improves, the seal is the issue.

Causes of seal degradation: Compressed ear cushions (most common after 12+ months of daily use) Glasses temples creating gaps in the seal Long hair caught between the ear cup and head

Step 4: Update or Reinstall Firmware

ANC headphones run firmware that controls the ANC algorithms.

Firmware bugs can cause ANC to underperform.

Check the companion app for pending firmware updates.

If a recent update seems to have caused the issue, some apps allow firmware rollback, though most do not.

For Sony: Headphones Connect app, About section shows firmware version and offers updates.

Step 5: Reset to Factory Defaults

A factory reset clears corrupted settings that can affect ANC behavior.

The reset process varies by model, consult the manual or manufacturer support page for your specific model.

After resetting: reconnect to your device through the companion app and reconfigure ANC settings from scratch.

Step 6: Test in a Different Noise Environment

ANC is optimized for specific frequency ranges.

If your noise environment has changed, new office, different commute route, the headphones may seem less effective because the noise is now in a frequency range where ANC is weaker.

Test in a known-good environment (near an HVAC unit, in a car, on an aircraft) to establish whether ANC is working at all.

If it works normally in one environment but not another, the issue is noise type mismatch rather than a headphone defect.

Step 7: Check Battery Level

Some headphones reduce ANC intensity at low battery levels to preserve runtime.

This is often undocumented.

If ANC seems weak, charge the headphones fully and test again.

Step 8: Check for Hardware Damage

If none of the above fixes work, the issue may be a damaged external microphone or a hardware fault in the ANC processor.

Signs of hardware damage: ANC creates a high-pitched hiss or tone (oscillation from damaged feedback loop) ANC amplifies some frequencies rather than cancelling them One ear cup has noticeably better ANC than the other Contact the manufacturer's support.

Most premium headphones (Sony, Bose) have 1-year warranties, and ANC failure is typically a warranty-covered defect.

Jabra offers 2-year warranties on professional headsets.

When to Replace vs. Repair

If the headphones are under warranty: contact the manufacturer first.

Hardware ANC failures are usually covered.

Compare against current replacement cost.

ANC processor failure: usually not economically repairable for consumer headphones.

For headphones over 3 years old with ANC failure, replacement is often more cost-effective than repair, as current generation ANC is meaningfully better than headphones from 2021-2022.