A Case for Mid-frequency Amplification?

Most individuals with hearing loss are affected mostly in the high frequencies. And, because consonants–those phonemes (distinctive speech sounds) that are believed to enable humans to differentiate one word from another–are high-frequency sounds, hearing aid fitting formulas universally call for high-frequency amplification. This continues to be a take-off of the old “audiogram fitting” approach (although with less…

Read More

Errors of the Acoustic Gain Prescribed Via Real-Ear-to-Coupler Differences (RECD)

Editor’s Note: This is an interesting concept and was introduced at the April 2011 meeting of the ANSI standard’s working group 80, now working on a revision of the S3.46 real ear standard. In this suggestion, the HA-2 coupler result is not as good as the HA-1, especially when using the same custom earmold that…

Read More