what do you think?, is real or use recording through speakers
Can be both. When the noise created by fans or audience isn't that loud enough, administrators may apply artificial cheers/noise making the game audience look lively. I do not think it affects the game negatively though, since a hyper environment keeps the excitement of the audience up and at the same time the adrenaline of the players.
I just know that because there are some stadiums that do not have enough supporters, but the cheers sound already full lively with drum strings also.
what do you think?, is real or use recording through speakers
The answer is yes, maybe the supporter's voice is just using a tool, but not all matches in every league.
Even if it is not real, but it is quite good to enliven the atmosphere of the match.
Rarely do people watch football matches or other sports matches that are not full of spectators such as the English Premier League or La Liga on live broadcasts that are broadcast paying attention to the same audience voice throughout the match.
I think the artificial cheers/noise is to initiate the participation of the audience. If there is enough activity and cheering, the admin will turn down the volume of the artificial cheering sound.