A system configured to personalize an audio signal to a user, the system comprising: a speaker (12, 14) configured to be proximate to a user's ear, configured to emit the audio signal; a sensor (26, 28, 30) configured to be proximate to a user's head, the sensor (26, 28, 30) configured to make an objective measurement associated with a user's hearing sensitivity to the audio signal; a database storing a plurality of user hearing profiles associated with a plurality of users; a processor (44, 88), coupled to the speaker (12, 14) and to the sensor (26, 28, 30), the processor (44, 88) configured to: receive from the sensor (26, 28, 30) the objective measurement associated with the user's hearing sensitivity to the audio signal; based on the audio signal and the objective measurement associated with the user's hearing sensitivity to the audio signal, determine a hearing transfer function associated with the user; identify the user based on the determined hearing transfer function associated with the user by comparing the determined hearing transfer function associated with the user to the plurality of user hearing profiles stored in the database; and based on the user identification, adjust the audio signal according to the user hearing profile of the identified user, wherein the user hearing profile of the identified user comprises a desired hearing transfer function, to automatically compensate for a difference between the desired hearing transfer function and the determined hearing transfer function associated with the user; and send the adjusted audio signal to the speaker (12, 14). a speaker (12, 14) configured to be proximate to a user's ear, configured to emit the audio signal; a sensor (26, 28, 30) configured to be proximate to a user's head, the sensor (26, 28, 30) configured to make an objective measurement associated with a user's hearing sensitivity to the audio signal; a database storing a plurality of user hearing profiles associated with a plurality of users; a processor (44, 88), coupled to the speaker (12, 14) and to the sensor (26, 28, 30), the processor (44, 88) configured to: receive from the sensor (26, 28, 30) the objective measurement associated with the user's hearing sensitivity to the audio signal; based on the audio signal and the objective measurement associated with the user's hearing sensitivity to the audio signal, determine a hearing transfer function associated with the user; identify the user based on the determined hearing transfer function associated with the user by comparing the determined hearing transfer function associated with the user to the plurality of user hearing profiles stored in the database; and based on the user identification, adjust the audio signal according to the user hearing profile of the identified user, wherein the user hearing profile of the identified user comprises a desired hearing transfer function, to automatically compensate for a difference between the desired hearing transfer function and the determined hearing transfer function associated with the user; and send the adjusted audio signal to the speaker (12, 14). receive from the sensor (26, 28, 30) the objective measurement associated with the user's hearing sensitivity to the audio signal; based on the audio signal and the objective measurement associated with the user's hearing sensitivity to the audio signal, determine a hearing transfer function associated with the user; identify the user based on the determined hearing transfer function associated with the user by comparing the determined hearing transfer function associated with the user to the plurality of user hearing profiles stored in the database; and based on the user identification, adjust the audio signal according to the user hearing profile of the identified user, wherein the user hearing profile of the identified user comprises a desired hearing transfer function, to automatically compensate for a difference between the desired hearing transfer function and the determined hearing transfer function associated with the user; and send the adjusted audio signal to the speaker (12, 14).