sound leakage; sound leaking out
Refers to sound escaping from headphones, earphones, or other audio devices, often a concern in public places.
There was a person on the train whose sound leakage was really bad.
このヘッドホンは音漏れが少ない。
These headphones have very little sound leakage.
Compound of 音 (sound) and 漏れ (leaking), from the verb 漏れる (to leak).