audibility
Technical term for the degree to which a sound can be heard, often used in acoustics, audio engineering, and audiology.
この部屋の可聴度を測定する必要がある。
We need to measure the audibility in this room.
Compound of 可聴 (audible) and 度 (degree). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese word formation patterns.