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They do not correct to a 'flat' frequncy response.

After looking at the correction curve shown to me by my audiologist, I asked whether a loud sound (such as a cymbal crash) would be portrayed accurately. She replied that it would depend on the level , in decibels, at which it was supplied. In other words, there is compression baked into the sound correction curve.
The programming tries to correct your hearing by a certain decibel level at the different frequency ranges...say, at 1, 2, 3, 4, 5 KHz...and so on. Some models have 8 correction points, some have more. The more correction points available, the better the potential to give you a more natural sound. But these are prescription devices and so the makers are compelled to protect you from excessive sound pressure. So the higher the average decibel level of the sound, the less boost they will give you at various frequency levels.
Say for example you are listening to music at an average sound pressure level of 65db. Suddenly there is a snare drum crack that would normally register at 90 db. Your hearing aids will compress it to something like 80db to protect your ears. So this is sound compression, and I found it occurs at all listening levels to some extent. The higher the sound level, the more compression is used.
I have concluded that listening at moderate sound levels will result in a more natural sound.


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  • They do not correct to a 'flat' frequncy response. - Mcmann57 07:01:54 07/27/16 (0)

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