The 1911/791 has the lower level ABT 1030 chip installed while the 2311/891 has the ABT 2015 which is very similar to the ABT 2010 in the Oppo 83. However, the Oppo 83 has all the features of the chip enabled while the chips in the Denon AVRs have some of the "tweaking" features disabled. Whether you notice a difference depends on the distance from the TV and how well your TV does at deinterlacing/upscaling.
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