Method to estimate the sound pressure level at eardrum using measurements away from the eardrum

A method for measuring an estimated sound pressure level at a tympanic membrane in an ear canal of an ear of a wearer of a hearing assistance device using measurements away from the tympanic membrane, the method comprising:

• placing a sound sampling apparatus in the ear canal at a first position;
• placing a sound emitter in the ear canal at a second position;
• generating sound with the sound emitter and receiving sound with the sound sampling apparatus to measure an amplitude response of the ear canal;
• and
• determining the estimated sound pressure level at the tympanic membrane using measurements of sound from the sound sampling apparatus including measurements of a null frequency and a null Q at the first position and the measured amplitude response.