More precisely the power spectral density, which is always real. The human ear seems only sensitive to phase when locating sounds binaurally: https://physics.

More precisely the power spectral density, which is always real. The human ear seems only sensitive to phase when locating sounds binaurally: https://physics.stackexchange.com/questions/277493/can-human-ear-distinguish-between-sounds-of-different-phase#277498 https://physics.stackexchange.com/questions/277493/can-human...