noun-modifying (irregular), noun
electro-acoustic
Technical term used in engineering and music technology to describe devices or systems that combine electrical and acoustic elements.
このスタジオには最新の電気音響機器が揃っている。
This studio is equipped with the latest electro-acoustic equipment.
電気音響変換器はマイクロフォンやスピーカーに使われる。
Electro-acoustic transducers are used in microphones and speakers.
Compound of 電気 (electricity) and 音響 (sound/acoustics), likely a calque from English 'electro-acoustic'.