参考文献：
[1] S.E. Olive, T. Welti and E. McMullin, "Listener Preferences for In-Room Loudspeaker and Headphone
Target Responses", 2013.
[2] S.E. Olive, T. Welti and E. McMullin, "Listener Preference for Different Headphone Target Response
Curves", 2013.
[3] S.E. Olive, T. Welti and O. Khonsaripour, "Perception & Measurement of Headphone Sound Quality: Is
There A Preferred Target Response", 2017.
[4] S.E. Olive, O. Khonsaripour, and T. Welti, "A Survey and Analysis of Consumer and Professional
Headphones Based on Their Objective and Subjective Performances,", 2018.
[5] ISO/TC 43 Acoustics, "ISO 226:2003 Acoustics - Normal equal-loudness-level contours",
2003.
[6] ISO/TC 43 Acoustics, "ISO 389-7:2019 Acoustics - Reference zero for the calibration of audiometric
equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions",
2019.