Any electrical circuit or mechanical device that removes or attenuates energy at certain frequencies.
The quality of the recording or reproduction.
The faithful reproduction of an audio signal; specifically, the variations in output level of less than 1 dB above or below a median level over the audio spectrum.
The number of waves (or cycles) arriving at or passing a point in one second, as expressed in hertz (Hz).
The range over which sounds are produced by a speaker, varying from low frequency bass to high frequency, i.e. 20Hz up to 20kHz (20,000Hz).
A speaker designed to reproduce all or most of the sound spectrum.