Also be aware that trying to process monaural audio (a HUGE amount of cable and satellite content) with DPL2 or DTS:Neo 6 often will make the sound WORSE, sometimes MUCH worse! At the very least, it will collapse into your center channel speaker.

When I have a mono audio track, I find that going to plain ol' stereo audio (two channel) is the best solution. If you MUST have audio coming from all over the room, try the Stereo 5 or Stereo 7 modes.