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A graph which shows how a system or piece of equipment or even an environment such as a room responds to different frequencies. Ideally, for audio work the graph should plot a flat line from below 20 Hz to above 20 kHz. In practise this is often not achieved, and the line will fluctuate up and down between these points, indicating that the equipment or environment makes some frequencies louder or quieter than others. Humans have a well documented "non-flat" response and this is the response used to specify the dB(A) scale for determining loudness. The term should not be confused with bandwidth which concerns itself only with the attenuation above an upper limit frequency and below a lower limit frequency and does not concern itself with the range between them. |
