Ah-may-ayn

Hi,

We are taught that one may not respond Amen louder than the blessing to which one is responding. However, there is an established custom of the baal keriah - the person who is doing the public reading of the Torah - singing "Amen" in a loud voice. This is acceptable for several reasons, including the goal of alerting the community that the Torah reading is beginning.

(Rivivot Ephraim 1:106)

Have a great day,
Mordechai