Sonorous

sonorous [ suh'-NAWR-uh's ]
[ adjective ]

MEANING :
1. (adj.) giving off a deep sound
2. (adj.) resonant or rich in sound
3. (adj.) an impressive style or manner of speech

USAGE EXAMPLE 1 :
The sonorous sound made by the horn marked the beginning of the games.

USAGE EXAMPLE 2 :
His chilling, sonorous tones were later brought to Hollywood, most notably as treacherous and overreaching power-seeker Saruman in "Lord of the Rings.