Frequency Response
•It is wrong to employ the free-field frequency response for correcting the recorded signals, as the free-field response does not take into account the modification of the ear duct resonance occurring when an ear bud is inserted in the pinna.
•This can be seen as a severe inconsistency of the current EN 50332-1 standard.
•It could be more advisable to employ a diffuse-field response (which is usually smoother)