It should be noted, however, that there is a requirement that ten men hear the Chazzan, but generally those sitting/standing nearby are capable of this. (See Mishna Berurah 124:41 and 127:3) During the rest of the Chazzan's repetition of Shemonah Esrei, the congregation should be listening to the Chazzan and not doing other things. (See Shulchan Aruch O.C. 124:4,7) With regards to Ahava Rabbah/Aha