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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement highpass filter for small speakers even without subwoofer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96904">96904</a>
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<th>Summary</th>
<td>Implement highpass filter for small speakers even without subwoofer
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<th>Product</th>
<td>PulseAudio
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>modules
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>patrakov@gmail.com
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<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
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<th>CC</th>
<td>lennart@poettering.net
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<div>
<pre>PulseAudio already has a crossover filter that sends low frequencies (that the
main speakers cannot reproduce) to a subwoofer.
There are at least two people (myself and bryak from linux.org.ru) who want a
similar feature that does the same filtering, but throws low frequencies away
instead of delivering them to a subwoofer. The problem is that small speakers,
when given low-frequency content, not only fail to reproduce it, but also let
it distort mid-range content (i.e. exhibit intermodulation distortions).
This feature is already widely implemented by Canton (a speaker manufacturer)
in their hardware, they call it "Displacement Control".</pre>
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