how about

[Mapping analog-surround-21]
device-strings = hw:%f 
channel-map = front-left,front-right,lfe,lfe
paths-output = analog-output-speaker
priority = 8
direction = output

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https://bugs.launchpad.net/bugs/1040873

Title:
  [N56VZ, Realtek ALC663, Black Headphone Out, Right] No sound at all:
  Subwoofer not working

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