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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Implement highpass filter for small speakers even without subwoofer
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>PulseAudio
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>modules
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>pulseaudio-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>patrakov@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>pulseaudio-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>lennart@poettering.net
          </td>
        </tr></table>
      <p>
        <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>
        </div>
      </p>


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