stentor +

(Greek: Greek herald in the Trojan war [Greek mythology]; powerful voice [literally, "groaner, roarer"])

stentor, Stentor
1. The mythical Greek warrior with an unusually loud voice who died after losing a shouting contest with Hermes.

Stentor was said to have a voice "as loud as that of fifty other men together".

2. A speaker with an unusually loud voice.
3. Any of several trumpet-shaped ciliate protozoans with a mouth at the broad end and which are members of the genus Stentor.
stentorian
1. Being loud, powerful, or declamatory in tone.
2. Very loud, extremely loud, or powerful in sound.
stentorious
A voice which is loud, powerful, or booming.
stentorophonic
1. Speaking or sounding very loud; stentorian.
2. Having a loud, powerful voice or making a loud sound.