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Oticon Dome Selection

Oticon Domes

When trying to decide what type of domes you need for your Oticon hearing aids, you need to know few things.  First of all you need to know what style of hearing aids you have.   Are your aids the slim tube type, Receiver In The Ear (RITE) or MiniFit? 


The differences include size of the end where the dome attaches, Slim Tube is an open tube and does not contain any electronics, RITE are light gray in color and larger diameter than the MiniFit.  The MiniFit are distinctly color coded, red for the right and blue for the left.

If your aids are of the slim tube type, then you need to use Corda domes which come in sizes small, medium, large and plus size.  All of the Corda domes except the Plus size are considered Open style domes.



If your hearing aids are the RITE type or MiniFit then you should select the RITE or MiniFit as appropriate.  Please note that these two types of domes are NOT interchangeable. 

RITE domes come in open, plus and power styles. 


The sizes are as follows: 

Open:  6mm, 8mm, 10mm

Plus:  one size only

Power:  6mm, 8mm, 10mm, 12mm

 MiniFit domes come in open, double bass, single base and power styles as shown in picture below. 



MiniFit domes come in the following sizes:

Open:  5mm, 6mm, 8mm, and 10mm

Double Vent: 6mm, 8mm, 10mm and 12mm 

Single Vent: 6mm, 8mm, 10mm and 12mm 

Power: 6mm, 8mm, 10mm and 12mm  


Please note that there are Plus size Corda domes and Plus size RITE domes

These are not the same.  Let's take a closer look at the under side. 


The general shape is the same.  The difference is that the opening where either the slim tube or the RITE speaker insert are of different diameter.
Dome Style: what's the difference?  Each style of dome has a purpose.  The open style domes are intended to be used for people who have high frequency hearing loss and do not need amplification in the lower frequencies.  These domes have numerous holes in them which lets the low frequency sound go directly in the ear bipassing the hearing aids.  The holes also serve the purpose of ventilating your ears which cuts down on the sensation that "you have your head in a bucket" when you talk or chew.  On the negative side, open domes are the most prone to feedback (whistle).  Plus style domes are more occlusive than the open domes so more low frequency energy can be amplified by the hearing aids and still keep the ears somewhat "open."  These domes significantly reduce the amount of feedback from hearing aids.  Power style domes are the most occlusive and are used for people with more hearing loss.  They can often be used for people who have moderate to even severe loss with minimal (if any) feedback.  The down side to power domes is that they stop up your ears considerably more.  The latest offerings are the double and single bass domes for the MiniFit speakers.  These domes fall in the middle between open and power domes.  Having two vent holes makes the double vent style less occlusive than the single vent style while the single vent style offers more feedback control than the double vent type.  
Summary:  Selecting the proper dome is important for not only comfort but for proper hearing aid function.  If you are experiencing difficulty with your current domes, most people can achieve improvement in function by selecting a different type of dome.  However, selecting a dome which is too different from what your hearing aids were originally set-up to use, may not work properly.  For this reason and others, we offer sample packs of domes.  We are currently adding to our offerings in type of sample packs.  Please check back to see the changes, or contact us for specific needs.
I hope that this little tutorial has been helpful and makes it easier to select the proper type and size of dome.