<h1>Audio Filter Grey -- AudéoWorld PFE Shopping Cart</h1>
<b>$12.95</b>
-- <i>Our easy-to-replace, passive audio filters adapt the frequency range to your individual listening preferences and provide crystal clear, luscious sound.</i>
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<img src="https://store.nexternal.com/audeoworld/images/filter-white-lrg.jpg" align="right" alt="Audio Filter Grey" name="Audio Filter Grey" border="0" hspace="10" />
The easy-to-replace, passive audio filters adapt the frequency response to your individual listening preferences and provide crystal clear, luscious sound.<br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />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.<br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />The grey audio filters provide stronger middle tones.<br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />The audio filter box comes with eight audio filters of the specified color and one changing tool<br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" /><b aria-level="0" aria-posinset="0" aria-setsize="0">Technical background</b><br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />When wearing Audéo PFE the ear canal is blocked and the function of the ear is changed: <br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />1. The amplification of the pinna disappears.<br aria-level="0" aria-posinset="0" aria-setsize="0" />2. The natural resonance of the ear canal disappears. <br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />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:<br aria-level="0" aria-posinset="0" aria-setsize="0" /><table aria-level="0" aria-posinset="0" aria-setsize="0" border="0" cellspacing="1" cellpadding="2" align="center">
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<td aria-level="0" aria-posinset="0" aria-setsize="0" align="center"><img aria-level="0" aria-posinset="0" aria-setsize="0" border="0" alt="Open ear simulator transfer function graph" align="left" src="https://www.nexternal.com/audeoworld/images/pfe-graph.png" width="649" height="340" /> <br aria-level="0" aria-posinset="0" aria-setsize="0" /></td>
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<td aria-level="0" aria-posinset="0" aria-setsize="0"> Figure 1: Open ear simulator transfer function</td>
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</table><br aria-level="0" aria-posinset="0" aria-setsize="0" />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. <br aria-level="0" aria-posinset="0" aria-setsize="0" /><br aria-level="0" aria-posinset="0" aria-setsize="0" />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.<br aria-level="0" aria-posinset="0" aria-setsize="0" /></p>
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<p><b>Other products in the category <a href="http://store.audeoworld.com/Category3" title="Accessories">Accessories</a>:</b>
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<a href="http://store.audeoworld.com/Product7" title="Audio Filter Black">Audio Filter Black</a> -- The easy-to-replace, passive audio filters adapt the frequency range to your individual listening preferences and provide crystal clear, luscious sound.</li></ul>
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<a href="http://store.audeoworld.com/Product5" title="Comply&trade; Foam Tips">Comply™ Foam Tips</a> -- The Comply™ foam ear tips fit all models: PFE and PFE with microphone.</li></ul>
<br clear="left"><br /><ul style="padding-left: 15px"><li>
<a href="http://store.audeoworld.com/Product6" title="Silicone Ear Guides">Silicone Ear Guides</a> -- The soft silicone ear guides help route the cables around the ear for optimum hold and noise reduction.</li></ul>
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<a href="http://store.audeoworld.com/Product4" title="Silicone Ear Tips">Silicone Ear Tips</a> -- The silicone ear tips fit all models: PFE and PFE with microphone.</li></ul>
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