There is a difference in volume between the left and right units of the headset, insufficient low-frequency sound.
For the proper sound quality and noise canceling function to be effective, select the earbuds that fit your ears the best.
If the size of the earbuds does not match the size of the ear holes, or the earbuds are not properly worn, the noise canceling function and sound quality may be significantly affected.
When you feel the noise canceling function and low frequency sound are insufficient, change the earbuds to ones that feel more sealed.
When changing the earbuds, try the earbud sizes in order from the larger sizes to the smaller sizes.
The size of the left and right earbuds may be different.