Originally Posted by evo5
Originally Posted by Dreamliner
I upgraded to the 4520 from a 4311. I wanted Neo X, 11.2 and Menu's on 3D. Sound quality seemed the same, though I will say the noise floor seems lower on the 4520, but was never an issue or noticeable until I went looking for it. There is better speaker level control on the 4311 and the 4311 has better display information (in and out signal displays).
Unless you are looking for one of the features I mentioned, there really isn't a reason to get a 4520. Feel free to buy mine when the next Denon comes out.
There is much improvement from DSX to Neo X in 11.2...or is it matter of preference?
What are the difference between this 2 technologies?
Not Dreamliner, but..
There are quite big differences between Audyssey DSX and DTS Neo:X. Primarily, this is in the way the additional information for the wide or height speakers is created.
DSX generates early reflections for the height and wide speakers. These reflections were not in the original soundtrack and DSX creates them or synthesises them, to give the impression that you are listening in a larger room than you actually are sitting in.
Neo:X, however, extracts ambient information from the soundtrack and directs that extracted information to the wides and heights.
These two important differences create quite different results on listening. Personally I prefer Neo:X to DSX, but this is a matter of choice as this is a preference issue - there are no discretely coded 11 channel soundtracks yet.
If you only have Height speakers, there is another option which is Dolby PLIIz. For Heights-only my preference order is PLIIz, Neo:X and DSX last.
PLIIz extracts the information for the height speakers from the surround channels whereas DSX generates it from the front left and right channels. This makes DSX give a 'wall of sound' effect at the front which, for me, destroys the all-important 'surround bubble'. I believe Neo:X gets the information from the front and surround channels for the respective right and left 'sides'.
So they all have their own methods and only you can decide which you prefer. If you have the ability to easily isolate the wide and height channels (ie by turning off the amps for the other channels) it is instructive to play content using just the height/wide speakers and hearing the differences between the different DSPs. They are quite pronounced.