Originally Posted by landshark1
I just want to update my observation on the topic.
I started off to use DSX at first. Thought it's.....OK (at best).
Then I was using PLIIz for awhile, it's a very subtle different with or without it in most movies. It only made some noticeable difference when you are watching the "right scenes", e.g. raining (but still not ALL raining scenes), Master&Command's famous demo scene where sailors walking/running on the upper deck, etc. If nobody tells me, I probably couldn't tell a difference or miss it if it's turn on or off.
I switched to use Neo:X lately. I think I like it a little more than PLIIz. I did some A/B test with a couple "coming from above scenes" on most Demo discs from this forum between the two. Scenes like the above mentioned Master&Command, Jurassic Park (power out, T-rex got out), etc.
Here's what I think.....
I personally don't really care for it and feel like it "rob" other channels (surrounds) to get you the scene of height sound. And it sometimes make the sound kinda weird, in my word, fake/non natural sound especially when you are watching like ESPN or similar channels. If I have to choose either to turn DSX on or no Height channel sound effect, I'd rather have it Off and let my height speakers collecting dust.
I feel like PLIIz's process put the height/above sound channels a bit more coming from the front stage/forward. You still can tell at certain scenes that the sound is above your head. But it's still "shifted" the sound a bit like above & in front of you rather than directly above you, if you know what I'm saying. On & Off difference is subtle, but you certain can tell especially doing a A/B comparison. I will leave it On the whole time and fine with it. No artificial, unnatural sounding at all.
I think I like it the most out of the three, so far. From what DTS said in the earlier posted interview, it also use the rear channels in combine of the front height channels to give you the directly above your head sound stage. And I believe it. The above/on top sound sounds more..... directly above you. Like rain, or people running/walking on the above floor, sounds like it's coming right on top of you or could even be, on top but behind you, or on top but you can tell it's more to your left/right than directly above. Versus PLIIz sound a little bit more "on top but slightly in front" of you.
p.s. I only use the 4520Ci to power the height channel speakers while using the Emotivas to power the rest.