The easy-to-replace, passive audio filters adapt the frequency response to your individual listening preferences and provide crystal clear, luscious sound.
The purpose of this filter is to provide you with the best quality sound that matches what you would hear naturally when not wearing ear tips. Hearing differs significantly from one person to another, and unlike standard earphones, Audéo PFE allows you to select the filter that works best for you.
The black audio filters provide stronger bass and treble.
The audio filter box comes with eight audio filters of the specified color and one changing tool
Technical background
When wearing Audéo PFE the ear canal is blocked and the function of the ear is changed:
1. The amplification of the pinna disappears.
2. The natural resonance of the ear canal disappears.
That has to be compensated by the earphone, so the target curve is theoretically the open ear transfer function, which corresponds to a flat curve in the free field and diffuse field:
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| Figure 1: Open ear simulator transfer function |
The earphones must recreate these phenomena for the user to perceive a natural sound. Since each person has a different ear, the compensation curves should be different from one person to the other. Standard earphones do not take these factors into account, which makes Audeo PFE unique.
Internal studies at Phonak have shown that most people are not comfortable with a sound from an earphone that reproduces exactly the curve of a standard open ear. The curves of Audeo PFE are a compromise between a frequency response that includes the full open ear gain compensation as well as one that has bass and treble predominance. This compromise has been shown to produce greater satisfaction among test users, and therefore Audeo PFE offers two filter types to accommodate the widest range of user preference.
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