Backstory: my girlfriend and I were at a sporting event, having casual conversation, but an announcement came over the loud speaker that caught my interest and I wanted to hear.
I turned my head so that I could give a visual queuecue that I was trying to listen to something else, but she continued to talk. The problem was her volume of talking was louder than the loud speaker (due to proximity of both her and the speaker) so that I couldn't hear the announcement.
In this situation, saying something such as "please give me a second, I'd like to hear this" would have made myselfme completely miss exactly what it was I was trying to hear. My only reaction I could think of was to quickly stop her by saying "shh" and focusing on the announcement. She didn't take it too well and I'm conflicted on whether it was the correct way to handle the situation.
How can I better convey that I don't want to miss a brief announcement?