Sometimes the audio tracks of videos aren't so great (ones that are old or not well-equalized, or in critical quiet passages). But subtitles are an aggravating distraction. Instead I juice up what's missing (YMMV) with this (mobile or desktop) toolbar pop-up browser extension:

https://mybrowseraddon.com/audio-equalizer.html

which can be quickly turned on-off, quickly adjusted, and saves named presets. For me it's been the audio equivalent of uBlock.