Apparently the DTS 6.1 standard was set such that speaker placement was pretty much the same as 5.1, but with an added center surround channel, one speaker directly behind the listener at 180 degrees from the front center speaker. It's hard to find a lot of references to 6.1 speaker placements as it seemed to die a pretty quick death, but here's one: http://www.crutchfield.com/S-h9jmTPqI9eK/learn/learningcenter/home/speaker_placement.html
Darin, so if I understand correctly, there's a way to configure the Realiser preset so the LFE channel can be fed to either of the front two speakers? This would actually make a lot of sense, because that way you can still take a 5.0 setup that you've virtualized using only one or two speakers (with no subwoofer), and then if you have a source that is 5.1 but the source player isn't itself capable of mixing the LFE channel into the other 5 channels (as it seems at least the PS3 is not, not sure about other blu-ray players -- there's no 5.0 or 7.0 LPCM output options, only 2.0, 5.1 or 7.1), you don't lose the sound from the LFE channel -- since the PRIR was created without an LFE channel speaker. I imagine if you had a processor, it could handle the mixing of the LFE channel into the other channels and it wouldn't be an issue. Or am I completely misunderstanding how the Realiser works with subwoofers that are or are not in the original speaker configuration that's being emulated?
Also, since you can't tell directionality from sound in the frequencies covered by the LFE channel, would it matter at all that it was only coming from the front two channels, and not from any of the other surround channels?
My question is mainly because I was curious about listening to a 5.1 channel source (a movie generally) using a "virtualized" 5.1 or 7.1 PRIR made with just 2 speakers and no subwoofer, without being able to convert it to 5.0 LPCM channels before passing them to the Realiser.