The room containing a played instrument is itself a second modifying system

Evidence

If we are modeling the effect of an instrument being played in a room, then the output we require is the sound heard by the listener and not the output from the instrument itself. The environment itself acts as a sound modifier, and therefore it too acts as a “system” in terms of the input/system/output model. The input to the model of the environment is the output from the instrument being played. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1059

Categorization

• XREF: Connects to my soundscape work on how environment shapes perceived sound — the room-as-system framing parallels the acoustics of architectural and natural spaces. — connects to: Room acoustics act as a second system cascaded after the instrument — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1059