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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Feature request: always refilter LFE on laptops, even if already present"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95506">95506</a>
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<th>Summary</th>
<td>Feature request: always refilter LFE on laptops, even if already present
</td>
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<th>Product</th>
<td>PulseAudio
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>core
</td>
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>patrakov@gmail.com
</td>
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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
</td>
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<p>
<div>
<pre>Some laptops have an internal subwoofer. The correct corner frequency for the
crossover filter to be used with such subwoofer is, let's say, 700 Hz.
Definitely not 120 Hz.
Let's see what happens if the user sets lfe-crossover-freq to 700, and then
listens to (2.0) music and watches a film witha 5.1 soundtrack.
Music doesn't have the LFE channel, so PulseAudio will synthesize it
(correctly, except for the overall gain, which is tracked as <a class="bz_bug_link
bz_status_NEW "
title="NEW - LFE channel not synthesized properly"
href="show_bug.cgi?id=95021">bug #95021</a>).
Frequencies below 700 Hz will be sent to the subwoofer, frequencies above that
will be sent to the main channels. So all is good.
A film soundtrack does, however, have an LFE channel. But it is intended to be
played on home cinema hardware, where the crossover frequency is 120 Hz. So,
the original soundtrack has some content between 120 and 700 Hz in main
channels. PulseAudio will leave it there, because it refuses to remix LFE if it
is already there. Result: tinny sound, because the subwoofer is essentially
unused.</pre>
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</p>
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