An apparatus for determining cochlear dead region comprising - a sound generation unit configured to provide an electrical sound signal, - an output transducer configured to generate an output sound (54; 100; 102) corresponding to the electrical sound signal, and - a control unit configured to detect cochlear dead region, wherein the control unit is configured to select a frequency region of interest and to cause the sound generation unit to provide -- a first electrical sound signal representing a first predetermined frequency band adjacent to the frequency region of interest with a first predetermined bandwidth, and a first predetermined sound pressure level and -- a first subsequent electrical sound signal representing a first subsequent predetermined frequency band comprising the frequency region of interest with a first subsequent predetermined bandwidth, a first subsequent predetermined sound pressure level, and a first subsequent predetermined time delay to the first electrical sound signal, wherein the first subsequent predetermined frequency band comprises the first predetermined frequency band and wherein the first subsequent predetermined bandwidth is wider than the first predetermined bandwidth and wherein the output transducer is configured to generate -- a first output sound corresponding to the first electrical sound signal and -- a first subsequent output sound corresponding to the first subsequent electrical sound signal with the first subsequent predetermined time delay to the first electrical sound signal. - a sound generation unit configured to provide an electrical sound signal, - an output transducer configured to generate an output sound (54; 100; 102) corresponding to the electrical sound signal, and - a control unit configured to detect cochlear dead region, wherein the control unit is configured to select a frequency region of interest and to cause the sound generation unit to provide -- a first electrical sound signal representing a first predetermined frequency band adjacent to the frequency region of interest with a first predetermined bandwidth, and a first predetermined sound pressure level and -- a first subsequent electrical sound signal representing a first subsequent predetermined frequency band comprising the frequency region of interest with a first subsequent predetermined bandwidth, a first subsequent predetermined sound pressure level, and a first subsequent predetermined time delay to the first electrical sound signal, wherein the first subsequent predetermined frequency band comprises the first predetermined frequency band and wherein the first subsequent predetermined bandwidth is wider than the first predetermined bandwidth and wherein the output transducer is configured to generate -- a first output sound corresponding to the first electrical sound signal and -- a first subsequent output sound corresponding to the first subsequent electrical sound signal with the first subsequent predetermined time delay to the first electrical sound signal. -- a first electrical sound signal representing a first predetermined frequency band adjacent to the frequency region of interest with a first predetermined bandwidth, and a first predetermined sound pressure level and -- a first subsequent electrical sound signal representing a first subsequent predetermined frequency band comprising the frequency region of interest with a first subsequent predetermined bandwidth, a first subsequent predetermined sound pressure level, and a first subsequent predetermined time delay to the first electrical sound signal, wherein the first subsequent predetermined frequency band comprises the first predetermined frequency band and wherein the first subsequent predetermined bandwidth is wider than the first predetermined bandwidth and wherein the output transducer is configured to generate -- a first output sound corresponding to the first electrical sound signal and -- a first subsequent output sound corresponding to the first subsequent electrical sound signal with the first subsequent predetermined time delay to the first electrical sound signal.