I was about to leap to the defence of the AVM90, and took another look at their respective results. SINAD is 105 vs 99 dB.
Maybe we should expect more for the much higher cost, but in fairness to Anthem (and Marantz) breaking through that 100dB barrier for AV gear is quite an achievement.
However, the X3600 measured 103/104 dB with 48kHz content, which is typical of AV material (as opposed to 99dB at 44.1kHz)
Further, the AVM90 is barely 1-2dB better at DNR and IMD, and if anything the Denon is slightly better in the 32 tone test.
Audioholics took similar measurements from the Anthem MRX 740 & 1140 receivers:
In this bench test report of the Anthem MRX 740 & 1140 AV receivers, preamp & amplifier performance is evaluated and compared. We cover Bass management and amplifier matrixing performance recommendations.
www.audioholics.com
It does make processors a bit difficult to justify.