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Could someone help me to identify the type of in this custom earmold?
The hearing aid is a Phonak Infinio sphere i90 with custom earmold and Ultra Power receiver.
In the photo, on my finger, I am showing an HF4 wax guard that I recently ordered, but unfortunately it is smaller in diameter than the one that fits the custom earmold.
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The HF3 filter is bigger than the HF4 filter.
The HF3 and HF4 are primarily used in certain brands of hearing aids (such as Phonak, Siemens, and ReSound).
| Feature | HF3 | HF4 |
|---|---|---|
| Diameter | 3.0 mm to 3.3 mm | 2.2 mm to 2.4 mm |
| undefined | ---- | ---- |
| Size | Larger | Smaller |
| undefined | ---- | ---- |
| Acoustic effect | Provides a wider acoustic aperture, minimizes high-frequency damping, and offers better acoustic reliability. | Has higher acoustic mass impedance due to smaller size. |
| undefined | ---- | ---- |
| Wax capacity | Larger capacity, designed for longer filter change intervals. | Smaller capacity, can block more quickly. |
| undefined | ---- | ---- |
You’re ignoring this member’s posts.
Thank you very much for your detailed answer!
I had the mistaken impression that the HF3s were smaller than the HF4s…
Best Regards
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