Jetrell Fo said:
Yes....I believe the LFE for DTS audio is supposed to be extracted from the rears.
Why do you believe this? Are there specs somewhere you've read (and remember that, AFAIK, theater DTS has totally different specs to home DTS).
While a low-pass filter would give you a LFE track, I have a feeling that there's more to it than that.
If the LFE track is matrix-encoded into the rears, similar to how a Dolby Surround track contains a surround channel matrix-encoded into the front channels, then you would need to run the audio through a theater DTS decoder to extract the intended LFE.