So I am deciding between the two receivers below, I will be using it with 2 Pol Audio Monitors 70s and a sub which I have not decided on yet. Trying to understand what is the difference here. The 1300x has Dolby Atmos, DTS-X, HDCP 2.2 and high-res audio. While the 2100X has Dolby TrueHD, Dolby Pro Logic IIz, DTS-HD Master Audio and 4K upscaling. So I'm really just hoping for an explanation on what each of these receivers are better suited for and what the features offer. Thanks http://www.accessories4less.com/make-a-store/item/denavrx2100w/denon-avr-x2100w-7.2-ch-x-95-watts-networking-a/v-receiver/1.html http://www.accessories4less.com/make-a-store/item/denavrx1300w/denon-avr-x1300w-7.2-ch-x-80-watts-networking-a/v-receiver/1.html