ABSTRACT
The ability of an audio system or audio component to produce a constant output level throughout the audio frequency range. A perfect response would exhibit a zero dB level difference from 20 to 20,000 Hz. However, speaker-room combinations, even good ones, often show deviations exceeding +/− 5 dB. An outstanding setup (combining an excellent room, excellent speakers, proper speaker placement, and perhaps a bit of assistance from a good equalizer) should be able to get that down to +/−2 dB. Most good audio amplifiers, CD and DVD players, and digital recorders have negligible variations over the audible bandwidth.
