Hearing protection calibration adapter device

A method of manufacturing a calibration device for a hearing earpiece configured to at least partially protrude into an ear canal of a user, the method comprising:

• providing a calibration base comprising a calibration insert, wherein an air chamber is defined between the calibration base and the calibration insert;
• and
• providing at least one earpiece receiving mechanism defined on the calibration insert, the at least one earpiece receiving mechanism configured to create a sealed connection between a given earpiece and the air chamber for calibration, wherein the at least one earpiece receiving mechanism is configured to at least partially receive the given earpiece, wherein the at least one earpiece receiving mechanism comprises a tensioning component, wherein the tensioning component is spring loaded and is configured to hold the given earpiece in the at least one earpiece receiving mechanism during calibration.