Bose's sound-quality guidance is spread across its headphone and speaker articles. Check the source first: try a different app and different types of media, because podcasts, local files, streaming services and video can differ in quality. Set the phone's volume to 90 to 100 percent so the headphones receive a strong signal, then use the headphone volume. Set the EQ on the source device to off or flat and disable loudness, compression and reverb. On a Windows computer choose the Stereo (A2DP) entry rather than Hands-Free for full-range audio.
Keep the headphones within 33 feet and away from interference such as electronics and walls. On the QC Ultra Headphones make sure the earcups are sealed and the cushions attached, since a poor seal thins the bass, and check the mode: Immersion adds immersive audio, Quiet and Aware use Bose-optimized stereo. Update the firmware at btu.bose.com and reboot the headphones. The wired audio cable gives a quick test that bypasses Bluetooth compression. If the sound is distorted on every source and mode after these steps, it needs service.
Differential
Likely causes of “Bose QuietComfort headphones and earbuds sounds distorted, muffled or unbalanced”, and how to tell them apart
- 1
The source is low quality
What separates it The sound is flat in one app because the source is low quality
How to confirm Try different media and different apps, to compare the sound quality
- 2
The device EQ or loudness is on
What separates it The sound is boomy or thin because the device EQ or loudness is switched on
How to confirm Set the device EQ to flat, and turn loudness off
- 3
The Windows hands-free profile
What separates it The music sounds tinny because the Windows hands free profile is in use
How to confirm Choose the Stereo entry on Windows, and not the Hands-Free one
- 4
A poor seal
What separates it The bass is thin because the headphones do not seal properly
How to confirm Reseat the earcups, and remove glasses, so that the headphones seal well
- 5
A weak Bluetooth link
What separates it The sound is choppy because the Bluetooth link is weak
How to confirm Stay within thirty three feet of the device, for a strong Bluetooth link
Before you touch a setting
Record this first — changing settings destroys the evidence
- The product and the mode that it is in
- The source app and the device that you use
- The EQ and the volume settings that are set
- Whether the cable sounds the same
Try in this order
0 of 7 completedChange the source
ReversibleChange the source, by trying other apps and other media, to compare the sound, and then test again to see whether it helped.
Set volume
ReversibleSet the volume, with the phone at ninety to one hundred percent, and use the headphone volume.
Flatten the EQ
ReversibleFlatten the EQ, by turning off loudness, compression and reverb on the device, and then test again to see whether it helped.
Choose Stereo on Windows
ReversibleChoose Stereo on Windows, and not the Hands-Free entry, for music, and then test again to see whether it helped.
Check the seal
ReversibleCheck the seal, by reseating the earcups so that they fit snugly around the ears.
Test with the cable
ReversibleTest with the cable, which bypasses Bluetooth, to see whether the sound improves, and then test again to see whether it helped.
Update
ReversibleUpdate the headphones at btu.bose.com, and then listen to the same track again, and then test again to see whether it helped.
Model-specific
What is true of this model and not of its siblings
- Modes and sound
- Bose describes Quiet and Aware as Bose-optimized stereo audio and Immersion as full cancellation with immersive audio.
- Volume
- Bose's speaker guidance is to set the source volume to 90 to 100 percent and adjust on the product.
- Other models this page answers
- These steps also fit the QuietComfort Headphones, QuietComfort Earbuds II.
Stop boundary
When this stops being a self-service repair
- !If sound is distorted on every source and with the cable, start a repair or replacement with Bose
- !If only one app sounds poor, contact that app
- !If bass changes with fit, reseat the earcups
Evidence ledger
Sources behind this answer
Volume, EQ off, Stereo versus Hands-Free and range.
Different apps and media types.
Quiet, Aware and Immersion audio.
Seal and cushions.
The company and its products.
Exact questions
Common questions
Why does my music sound thin?+
The source, EQ, Windows profile or a poor seal.
What phone volume is best?+
90 to 100 percent, per Bose.
Should I turn EQ off?+
Set it flat and disable loudness and compression.
What is the Windows Stereo entry?+
The A2DP listing for full-range audio.
Does the mode matter?+
Immersion adds immersive audio; Quiet and Aware use stereo.
Does the seal matter?+
Yes, a poor seal thins bass.
Can the cable help?+
It bypasses Bluetooth for a comparison.