I thought Neo 6 was something like DTS? DLP II is just a DSP which converts your stereo source input to a fake 5.1 format
It is, essentially. As mentioned, it's good for television and two-channel soundtracks. I also find it good for older EBM and indiegoth music that usually lacked something in production technique.
Take an older Sisters of Mercy album, Floodland, for instance. The thing was cut on forty-eight tracks but mastering techniques in the 1980's were pretty flat. Tweak the thing out and you've got a wraith in the streets of London. If not, the disc doesn't make it out of the car.
I don't really consider electronic music organic to begin with, so I don't have any problemo with futzing about. Hell, on the last NIN disc Reznor had a website on which you could download inserts so as to re-edit the cuts yourself with Pro-Tools.
I find that DDII is what I USE MOSTLY.
Used to use the music mode some for music, but the new wore off, I just like music played
the way it was intended
LG 42", integra 6.9, B&W 602s2, CC6 center, dm305rears, b&w
Panny DVDA player
sharp Aquos BLU player
pronto remote, technics antique direct drive TT
Samsung SACD/DVDA player
emotiva upa-2 two channel amp
NEO:6 takes two channel material and runs it through the same digital matrix decoder that DTS-ES Matrix 6.1 runs through to create 6.1 channel sound.
PLIIx takes two channel, 5.1 channel, and 6.1 channel material and runs it through a unique decoder (developed by Jim Fosgate for Dolby Labs) to produce either 5.1, 6.1, or 7.1 sound.
Both NEO:6 and PLIIx do some amazing things, and both have cinema and music modes, though PLIIx also has a number of adjustable parameters even in the consumer-level offerings.
I use PLIIx a lot. I use NEO:6 rarely. However, NEO:6 is a good process which is preferred by some for a number of reason. Occasionally, I'll switch to NEO:6 just to get a different perspective on multichannel matrixing, and it's usually quite pleasant. Once in a while I even prefer it.