ANC sound impact on audio

#1
ANC is said not to noticeably reduce audio quality.
#2
The reviewed ANC usually improved listening by reducing outside distractions without making music sound worse; some reviews tied better clarity to the reduced noise floor.
#3
The best evidence says ANC avoids harming sound quality, but some processing modes still introduce artifacts or sound less natural when audio is not masking them.
#4
Reviewers note that ANC mode changes the sound slightly, with one preferring ANC on for fullness and another preferring ANC off for tighter bass.
#5
ANC mode can affect audio balance, with positive listeners tolerating it but negative reviewers hearing muddier bass or changed clarity when noise control is toggled.