The biggest complaint in the wearing and use of hearing aids, over the past 25 years, or longer, has been that the User feels like their ear is plugged up, or occluded, resulting in the Wearer of hearing aids feeling like they are under water, or that their ears are otherwise plugged up.
This is especially true, when the User has normal hearing in the lower frequencies and only suffers from a high frequency hearing loss.
The easiest way to understand low frequency and high frequency is to relate those sounds to a piano keyboard/
There are 88 black and white keys on a piano keyboard.
Middle C is the 40Th key from the left hand side.
It vibrates at 261 cycles per second. It is a pure tone and can be replicated forever.
Every 12 keys on the keyboard is referred to as an octave (octo means 8 except their are 1/2 keys which result in there being 12 keys to an octave)and Octave means a doubling of vibrations.
Since there are a total of 88 keys on the keyboard, and middle C is the 40Th key, that means there are 48 keys to the right of middle C, or 4 octaves.
The first 2 octaves to the right o middle C, or 24 keys, are referred to as the low frequency area in Audiology.
For the most part, all the vowels are spoken, and heard in that range.
Those signals, or notes, are also spoken or projected from the throat, at 3 times the energy o the high frequency notes or sounds.
Generally speaking, the average Human Being, hears better in the low frequency range, the exception usually being because o ear disease,etc.
The last 24 keys on the right-hand side of the keyboard are referred to as the High Frequency area. and most the consonants, which form the words in the English Language, are spoken and heard in that range.
Most People, who can't distinguish the difference in words, suffer from a high frequency hearing loss.
The problem with using hearing aids in the past has been, at least for those with a high frequency hearing loss, while they don't need or want, any low frequency hearing amplification,is that when they inserted any type o hearing aid into their ear, regardless of the size of the vent provided, the User still felt plugged up.
Those with a flat loss, or a loss in the low frequencies, didn't get that feeling.
The Open fit designed hearing aid, and the receiver-in-the-canal hearing aid, because of design, don't get the feeling of being plugged up, and yet can receive the benefit of only high frequency hearing amplification to compensate for their high frequency hearing loss.
For more information please call: Eugenia @ (800)432-7114