Is it right to say "a 5,000-man choir"?

TELAWAA: Sunday, December 27, 2015

I was in a church for a programme and I heard the anchorman say:
"I present to you a 5,000-man choir"

Immediately, I nodded and said: "Wow! Good English".
That came from me almost spontaneously because I knew most people are likely to commit a blunder while trying to say that. Similarly, some other people are likely to be confused enough to ask: "How can he say 'a 5000-man choir' "?

There are TWO key points to look into here, when trying to dissect the grammaticality of that expression.

 I need you to talk to me about it. What do you have to say about the expression?

May I have you talk to me.