There are two ways to balance the headphones: free field equalization and diffusion field equalization. Free field equalization assumes that the environment is not reflective, such as the wilderness; diffusion field equalization simulates a room with reflection, and its sense of hearing is more natural than the free field equilibrium. . The International Electrotechnical Commission's method for testing the flatness of a diffused field can be found in the standard IEC 60268-7. However, the diffusion field equalization is modeled on a standard head shape and room model. It is not satisfactory to all users and is not suitable for some recordings, such as dummy head recording.
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