California Hearing Aid Dispenser Written Exam Practice 2025 – Complete Prep Guide

Power or double domes are specifically designed to amplify louder sounds effectively. Their construction allows for a wide acoustic opening while still providing a snug fit in the ear canal, which helps in capturing sound more efficiently from the environment.

These domes are commonly utilized in hearing aids fitted for individuals with moderate to severe hearing loss. The design of the double dome helps to increase gain—meaning it boosts volumes significantly—which is particularly beneficial for those who struggle to hear louder sounds.

In contrast, the choice of domes impacts how different frequencies are handled. For example, soft sounds and high-frequency sounds typically require different types of fittings or domes that cater to clarity and comfort rather than just amplification. Medium sounds may not specifically require the enhanced amplification provided by power domes. Hence, they are best suited for addressing the amplification of louder sounds in a more effective manner.