The present invention provides the methods of a kind of Bao Ershi hearing evaluations equipment and the performance for assessing Bao Ershi hearing devices. Illustrative Bao Ershi hearing evaluation equipment includes earmuff, which limits internal volume and can at least partly be positioned to wrap on the ear of user. The earmuff includes the acoustic interface that shell, liner and the outside from earmuff extend to internal volume. The acoustic interface can be sealingly engaged with microphone.
