Stentorian
Part of speech: adjective
Definition: (of a voice) loud, powerful, booming, suitable for giving speeches to large crowds
Booming
Part of speech: verb
Definition: To make a loud, hollow, resonant sound.
Example sentence: On the rare occasions when I spend a night in Oxford, the keeping of the hours by the clock towers in New College, and Merton, and the great booming of Tom tolling 101 times at 9 pm at Christ Church are inextricably interwoven with memories and regrets and lost joys. The sound almost sends me mad, so intense are the feelings it evokes.