The entire ceiling area was faced with acoustically absorbent material.
Thus we may speak appropriately of the acoustic quality of a room or hall, describing it as good or bad acoustically, according as speaking is heard in it easily or with difficulty.
Good sight lines are important acoustically as they prevent absorption of the direct sound by grazing incidence over the heads of the audience.
The floor is a wire trampoline stretched between the walls with an acoustically transparent catch net below.
However, not many people realize that many of Nirvana's songs either use an acoustic guitar or can be played acoustically.