Talk louder. Could you speak up a bit? I can't hear you / It's getting bad - it's time someone spoke up about it / We need to have the right people around us who will speak up if they see us getting out of balance.
You’ll have to speak up because it’s a bad line.
They can't hear you in the back of the room. Please speak up.
[You have to speak up. The people in the back can't hear you.]