LFE for headphone

I have a good headphone connected to integrated sound card and after some test, the LFE is not present.
I have test with LAV&ffdshow and AC3filter.
Well, AC3filter always output in 2.0 when I put "same input", and "4.0" output also!!!
With ffdshow (same LAV), I have a good spatial but no LFE without mixer and "same input", on Dolby Prologic II without GRV it's good for me but this choice is not present in LAV audio.
It's strange than I haven't LFE in "same input" with "headphone virtualization".

The output of the decoders is processed by the sound driver. So the audio settings in the Windows Control Panel also matter.

With a 2.0 source it is of course normal that the LFE channel is empty. Only 5.1 (and above) sources have a LFE channel.

arf, sorry, I use a audio test file with a 5.1 who tests each channel, and I have not LFE.
My problem isn't 2.0 to 5.1 but 5.1 to headphone.

You need to adjust the sound settings in the Windows Control Panel. Your sound driver also performs mixing.

Well, I've check my sound card and no support it, I haven't the remix for Bass from a audio 5.1 to my headphone by default. Are you a idea? (Realtek ALC887 MB ASUS)
Also, I have test LAV audio with Stereo Dolby PrologicII and why LFE mix level is 0 by default? what value is better for headphone, 0.71?

If you want to include the LFE channel when down-mixing to stereo, then you need to set it to 1.58. It is 0 by default because the LFE is normally not supposed to be included for normal stereo speakers. The other surround channels also already contain low-frequency sounds.
A related technical document:
http://www.itu.int/rec/R-REC-BS.775-3-201208-I/en

I personally also usually set the center to 1.0 to get a bit louder voices.

Thx, I have a good headphone, LFE works fine.

Thank you for this option in audio choice.