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A comment on No correlation between headphone frequency response and retail price. Parent comment

Re:No correlation between headphone frequency response and r... by codedokode on Thursday June 15, 2017 @02:21PM (#14562963)
Non-linear effects can be seen when measuring THD. Any non-linearity will distort the sound and create additional frequencies in the output.
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Re:No correlation between headphone frequency response and r... by dom0 on Thursday June 15, 2017 @02:56PM (#14563320)
That's not correct. THD measures some non-linearities and is unable to detect others (e.g. IMD).
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