I think it just means louder that most (but not all) of the other people. I didn't think much of it until I had some American friends visit me and I took them to bar near where I live. I didn't really noticed anything while we were all sitting together.
When I crossed the room to go to the bar for another round, then I noticed that I could clearly hear my American friends voices above everyone one else in the room. I could clearly hear their conversation from across the bar. They were just speaking somewhat louder than everyone else.
and here I thought the idea was to avoid to have subscriptions ๐คฃ