Originally Posted by sdrucker
SOM or whomever,
What does the 4520 have that the X4000 doesn't, other than a couple more amps and bit more wattage per channel?
From a description on the Denon website, for people with conventional uses for an AVR that want XT32 + Sub HT (i.e. AVR as A/V switcher, VP with 3D passthrough & 4K upscaling, a 5.1 or 5.2 setup, and the usual Denon goodies), the differences appear subtle.
Not in the market with my 4311, just curious.
You are right, the differences are subtle. The 4520 has improved Burr Brown 32bit DACs over the 4311, which most will argue are not discernible and make no difference (these are typically the non-owners though). I might agree that for home theater, the differences are probably negligible. However, I will mention that my old Pioneer had 24bit Wolfson DACs, and I do not miss them one bit for stereo music that I am familiar with.
More importantly is the 4520 is the only receiver/processor (other than its brother Marantz 8801) to have the newer Audyssey feature LFC; never tested it so I have no idea if it is beneficial or not. Also, this is the only Denon to have DTS NEO:X. In my opinion, this is a BIG deal if you plan to do 11.2. I have tried Audyssey DSX as well, which is more commonly found on receivers that do 11.2, and have found DSX colors the audio track too much, especially in lower frequencies. There are a few movies out that have a native DTS NEO:X formatting (Expendables 2 comes to mind), so we are starting to see actual content for that sound codec, whereas DSX is still just matrixing.
With that said, if you are doing just 5.1, you will not benefit at all from just about all of the features listed above.