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<p>* <a href="page.php?w=Mobile_phones">Mobile phones</a>. The internal loudspeaker is driven by up to 1&nbsp;W. Class&nbsp;D is used to preserve battery lifetime.<br/>
* <a href="page.php?w=Hearing_aids">Hearing aids</a>. The miniature loudspeaker (known as the receiver) is directly driven by a class-D amplifier to maximize battery life and can provide levels of 130&nbsp;dB&nbsp;SPL or more.<br/>
* <a href="page.php?w=Powered_speakers">Powered speakers</a> and active <a href="page.php?w=subwoofers">subwoofers</a><br/>
* <a href="page.php?w=High-end_audio">High-end audio</a></p><p>
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