effect of adjusting the tone control and venting a hearing aid system in sensorineural hearing loss

ABSTRACT

Changing the frequency response of a hearing aid can be accomplished by the use of tone control switch or venting the car mould. The results of these modifications are usually supplied by the manufacturer in the form of 2cc cavity data. Real ear measurements differ from 2cc measurements. In this study 32 patients had their real ear measurements evaluated with the effect of the tone control and a 2mm vent in the ear mould calculated singly and in combination, to study their effect and to examine how it varies from the 2cc values. From the results it was concluded that the combination of both methods results in less reduction in gain than each separately, the difference between the real ear measurements and the 2cc coupler measurement may be due to the fact that patients do not use the full gain of their hearing aids and calculations in 2cc coupler are made with gain at the maximum