options snd-hda-intel model=dell

enable-lfe-remixing = yes
default-sample-channels = 3

sudo gedit /etc/pulse/daemon.conf

enable-lfe-remixing = yes
default-sample-channels = 3
default-channel-map = front-left,front-right,lfe

sudo gedit /etc/pulse/default.pa

load-module module-combine channels=3 channel_map=front-left,front-right,lfe