Hello, I have an ASUS laptop integrated into my Bedroom Theater and 2.1 sound system. Currently I have an Audioquest Dragonfly DAC plugged into the USB 2.0 port from there the 1 stereo output of the Dragonfly heads over to a spliter after that one end goes to an amp for the main speakers and the other goes to a wireless transmitter for the subwoofer and all the filtering gets done at the sub Via a low pass filter @ 60Hz

I want to get rid of the headphone splitter and use the factory (unused) output for the subwoofer (if Possible)
also I do want to bypass the sub's built in low pass filter for something in the PC itself

Laptop info
8GB Ram
Audioquest Dragonfly. (Stereo)
Realtek "HD" audio (stereo)