ANC sound impact on audio

#1
ANC is said not to noticeably reduce audio quality.
#2
Reviewers note that ANC mode changes the sound slightly, with one preferring ANC on for fullness and another preferring ANC off for tighter bass.
#3
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.