I see something different between the Champions League and Premier or another league on TV. the Champions League resonance looks more high-class because that cheers sound. That possible official creates this to make it more valuable than another league.
any chance you can share the video of the highlights you've watched so I can hear for myself? anyway, the only time I've heard of stadiums using fake cheers was during the COVID-19 pandemic (which is understandable) but at present maybe they are also using it when there are not many people watching.
I Watch on a non-official streaming TV apk, where I can watch the highlights of every match. The match Monaco vs Red Star, and Stum vs Sporting where have a few supporters but that sound like have a full stadium.