[alsa-devel] 2 speakers are assigned to the same DAC, this can't support 4.0/2.1 channles

[Raymond Yau]

>>> The alsa-info.txt for that Dell machine is at
>>
>> http://pastebin.ubuntu.com/11667982/
>>
>> The subwoofer is also at mono pin complex, are  there any low pass filter
>> for the subwoofer or vendor coeff need to be set ?
>
> I don't know it, I guess there is no hardware filter, it will work with
the software low pass filter in the pulseaudio.
>>

The funcional block diagram indicate equaliser is only connected to port D
This mean only the internal speaker can use high pass filter

Do you mean your can hear high frequency from the subwoofer of alc255 ?