Method for adapting a hearing device, wherein the hearing device has: - a signal processing unit for processing an electrical input signal into an electrical output signal based on a transfer function, - a receiver for outputting an acoustic output signal based on the electrical output signal, and - an individual sound transmission element connected to the receiver, wherein the individual length of the sound transmission element has a value of 2 mm to 20 mm depending on the user and wherein the receiver and the individual sound transmission element form an individual transmission system with a frequency-dependent individual amplification profile for the acoustic output signal, wherein the individual amplification profile is determined and stored for a subsequent fitting process and wherein a) the individual amplification profiles are measured by the manufacturer for a multiplicity of individual transmission systems, b) local extrema and inflection points are extracted from these individual amplification profiles as data pairs characterizing the profile, and the data pairs are stored in a database, c) during a fitting process at an acoustician, the individual length of the individual sound transmission element intended for a respective hearing aid wearer is determined, d) for the individual transmission system, the data pairs stored for it in the database are retrieved, e) the associated individual amplification profile measured by the manufacturer is reconstructed from the data pairs stored for this purpose, f) the individual amplification profile is compared by means of a setting unit with a stored reference amplification profile and differences (Δ1,Δ2) are determined, g) a reference transfer function of the signal processing unit is adapted based on the differences (Δ1,Δ2), so that an individual transfer function is obtained, which takes into account the individual sound transmission behavior of the individual sound transmission element and with which the processing of the electrical input signal is then carried out. - a signal processing unit for processing an electrical input signal into an electrical output signal based on a transfer function, - a receiver for outputting an acoustic output signal based on the electrical output signal, and - an individual sound transmission element connected to the receiver, wherein the individual length of the sound transmission element has a value of 2 mm to 20 mm depending on the user and wherein the receiver and the individual sound transmission element form an individual transmission system with a frequency-dependent individual amplification profile for the acoustic output signal, wherein the individual amplification profile is determined and stored for a subsequent fitting process and wherein a) the individual amplification profiles are measured by the manufacturer for a multiplicity of individual transmission systems, b) local extrema and inflection points are extracted from these individual amplification profiles as data pairs characterizing the profile, and the data pairs are stored in a database, c) during a fitting process at an acoustician, the individual length of the individual sound transmission element intended for a respective hearing aid wearer is determined, d) for the individual transmission system, the data pairs stored for it in the database are retrieved, e) the associated individual amplification profile measured by the manufacturer is reconstructed from the data pairs stored for this purpose, f) the individual amplification profile is compared by means of a setting unit with a stored reference amplification profile and differences (Δ1,Δ2) are determined, g) a reference transfer function of the signal processing unit is adapted based on the differences (Δ1,Δ2), so that an individual transfer function is obtained, which takes into account the individual sound transmission behavior of the individual sound transmission element and with which the processing of the electrical input signal is then carried out. a) the individual amplification profiles are measured by the manufacturer for a multiplicity of individual transmission systems, b) local extrema and inflection points are extracted from these individual amplification profiles as data pairs characterizing the profile, and the data pairs are stored in a database, c) during a fitting process at an acoustician, the individual length of the individual sound transmission element intended for a respective hearing aid wearer is determined, d) for the individual transmission system, the data pairs stored for it in the database are retrieved, e) the associated individual amplification profile measured by the manufacturer is reconstructed from the data pairs stored for this purpose, f) the individual amplification profile is compared by means of a setting unit with a stored reference amplification profile and differences (Δ1,Δ2) are determined, g) a reference transfer function of the signal processing unit is adapted based on the differences (Δ1,Δ2), so that an individual transfer function is obtained, which takes into account the individual sound transmission behavior of the individual sound transmission element and with which the processing of the electrical input signal is then carried out.