[pulseaudio-tickets] [Bug 95506] New: Feature request: always refilter LFE on laptops, even if already present

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95506

            Bug ID: 95506
           Summary: Feature request: always refilter LFE on laptops, even
                    if already present
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: core
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: patrakov at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

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 bug #95021).
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.

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