This is Kid's Box Quiz.
It sounds like the audio is saying (link with a time stamp corresponds the following)
Let's hear it for these two clever kids in today's big final:
per this post,
Hear means that sounds come into your ears whether you want it or not, while listen means that you consciously pay attention to what you hear, that is you want to hear something: ... – I'm listening, but I can't hear anything. – We heard a terrible noise when the cars crashed in front of our house.
In the case of Kid's Box Quiz, why does the announcer use "hear" rather than "listen", does that mean the audience does not need to pay much attention?