The contralateral remote masking (CRM) caused by a high‐frequency‐band noise is determined in the frequency range 250–1200 cps. The threshold shift expected from the mechanical changes due to the aural reflex is calculated on the basis of measurements of the acoustic impedance at the ear drum. The two sets of measurements are performed on seven subjects. The results support the assumption that central factors predominate in the CRM and that the middle‐ear muscles are responsible for a small part of the masking only.