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Earmold Acoustics, Size Does Matter!

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1.  Which of the following earmold components does not have an essential acoustical function? Vent Pull Cord Tube Receiver

2.  What is the significance of wall thickness in an earmold? Restricts selection of receiver size Helps selection of tubing Restricts selections based on aesthetics All of the above

3.  What instrument is recommended to verify dimensional suitability for placing both vent and receiver in an earmold? Caliper Otoscope Audiometer Ruler

4.  Which vent type should be considered when desired vent size cannot be placed in earmold due to size restrictions? Selective vent IROS External/Trench Vent None

5.  Having aesthetic concerns in mind, what should you consider for hearing aid type when there is not enough room for any receiver size due to wall thickness restrictions? Larger receiver size BTE Hearing Aid with either slim tube or #13 tubing Receiver with angled nozzle CIC Hearing Aid

6.  In what circumstances should you consider receivers with angled nozzles? Profound hearing loss Tinnitus Ear canal with sharp first and second bends and limited space between first and second bends. None of the above.

7.  Which of the following best describes the function of acoustic mass in earmolds? Dictates the physical weight of the earmold Dictates how much unaided ambient sound passes through the vent, and how much internal sound (e.g., voice) leaks out of the vent Provides uniform attenuation at all frequencies, to improve musical appreciation All of the above

8.  Which of the following is NOT CORRECT for the relation between acoustic mass and vent? Acoustic mass increases as both earmold vent length and diameter increase Acoustic mass increases as vent length decreases and diameter increases Occlusion effect can be decreased by decreasing acoustic mass of the vent Occlusion effect can be estimated based on acoustic mass

9.  Which of the following is NOT a benefit of custom earmold over universal domes? Achieving desired acoustic mass Consistency in achieving desired acoustics Cost Predictable acoustic results for each individual

10.  Precise acoustic mass can be achieved with the following earmold production method: 3D Design & 3D Print Drilling for vent with appropriate tool Casting Combination of all