Editing Distortion (section)

===Frequency response distortion===
{{See also|Frequency response}}
Non-flat frequency response is a form of distortion that occurs when different frequencies are amplified by different amounts in a [[Filter (signal processing)|filter]]. For example, the non-uniform frequency response curve of AC-coupled [[cascade amplifier]] is an example of frequency distortion. In the audio case, this is mainly caused by room acoustics, poor loudspeakers and microphones, long loudspeaker cables in combination with frequency dependent loudspeaker [[Electrical impedance|impedance]], etc.