Describing music:
* The band played an acoustic set of their most popular songs.
* I prefer the acoustic version of that song to the electric one.
* The acoustic guitar has a warm, mellow sound.
Describing a space:
* The library is a very acoustic space, making it ideal for studying.
* The concert hall has excellent acoustic properties, allowing the music to resonate beautifully.
Other uses:
* The acoustic engineer adjusted the sound system to improve the sound quality.
* Scientists studied the acoustic properties of the ocean floor.
* The acoustic guitar is a popular instrument for both beginners and experienced musicians.