Mar. 01, 2016
The most important element in a hearing aid fitting is the OSPL90. This, according to ANSI 3.22, is the maximum sound that can be transduced with a 90 dB SPL input. The OSPL90 is a well-defined measure that provides information on the maximum output, and when combined with other measuring tools such as the Real Ear Coupler Difference (RECD) can