System configured to perform at least a validation mode of a hearing test, said system comprising: a diagnostic device; one or more electrodes (31, 32) configured to be arranged on the scalp of a person and configured to be connected to said diagnostic device; and a sound emitting device configured to be connected to said diagnostic device and to transmit a generated sound stimulus into the ear of a person, wherein the diagnostic device includes a recording processor configured to receive a response signal from said one or more electrodes arranged on the scalp of a person; a control unit configured to control the mode of operation of said diagnostic device; and a signal generator configured to transmit said generated stimulus to said sound emitting device, characterized in that in a validation mode of operation set via the control unit, said mode being configured to evaluate the hearing ability of a person in an aided condition, i.e when the person is wearing a hearing aid, said signal generator is configured to generate said sound stimulus and to transmit said generated sound stimulus to said sound emitting device, wherein the signal generator generates said sound stimulus by amplitude and/or frequency modulating speech of a human. a diagnostic device; one or more electrodes (31, 32) configured to be arranged on the scalp of a person and configured to be connected to said diagnostic device; and a sound emitting device configured to be connected to said diagnostic device and to transmit a generated sound stimulus into the ear of a person, wherein the diagnostic device includes a recording processor configured to receive a response signal from said one or more electrodes arranged on the scalp of a person; a control unit configured to control the mode of operation of said diagnostic device; and a signal generator configured to transmit said generated stimulus to said sound emitting device, characterized in that in a validation mode of operation set via the control unit, said mode being configured to evaluate the hearing ability of a person in an aided condition, i.e when the person is wearing a hearing aid, said signal generator is configured to generate said sound stimulus and to transmit said generated sound stimulus to said sound emitting device, wherein the signal generator generates said sound stimulus by amplitude and/or frequency modulating speech of a human. a recording processor configured to receive a response signal from said one or more electrodes arranged on the scalp of a person; a control unit configured to control the mode of operation of said diagnostic device; and a signal generator configured to transmit said generated stimulus to said sound emitting device, characterized in that in a validation mode of operation set via the control unit, said mode being configured to evaluate the hearing ability of a person in an aided condition, i.e when the person is wearing a hearing aid, said signal generator is configured to generate said sound stimulus and to transmit said generated sound stimulus to said sound emitting device, wherein the signal generator generates said sound stimulus by amplitude and/or frequency modulating speech of a human.