A loose-fitting headband for the BC transducer provides thresholds with:

A loose-fitting headband for the bone conduction (BC) transducer can lead to less accurate thresholds compared to a snug fit. This is primarily because a snug fit helps ensure better contact and stability between the transducer and the skull. When the headband is loose, the transducer may not maintain consistent contact with the bone, leading to variations in the amount of sound that effectively stimulates the cochlea. This inconsistency can result in fluctuating threshold readings, making it difficult to obtain precise measurements of hearing sensitivity.

Moreover, the aim of bone conduction testing is to measure the auditory system's response via direct stimulation of the cochlea through vibrations. A secure fit allows for more reliable transmission of these vibrations, reducing the potential for external variables that can affect sound perception. Thus, a snug fit provides a more controlled testing environment, significantly enhancing the accuracy of thresholds obtained during the examination.