Oh one more option that caphill likes to recommend is the Classe Sigma SSP processor. It supports 4K, however only supports HDCP 2.2 through one input (HDMI input 4). It is also a very nice processor, but as good as it is, it does not have discrete analog stages like the Marantz. The Classe is quite a bit smaller, so if size is an issue, than Marantz may not be an option. The Marantz is definitely a beast. The Classe Sigma SSP is in the same $2500 price range. There's actually one for sale from TMR Audio for $2408.
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In a comparison, Marantz AV8802a with fuse upgrade VS Classe Sigma SSP, I honestly do not know which one would win. Personally, I would actually go with the Marantz and work with fuse/power cord upgrades because of the fully discrete analog stages. In all my R&D and testing with circuits, as good as monolothic op amps can be, they never reached the sound quality of fully discrete analog stages. My own personal opinion, of course.
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In a comparison, Marantz AV8802a with fuse upgrade VS Classe Sigma SSP, I honestly do not know which one would win. Personally, I would actually go with the Marantz and work with fuse/power cord upgrades because of the fully discrete analog stages. In all my R&D and testing with circuits, as good as monolothic op amps can be, they never reached the sound quality of fully discrete analog stages. My own personal opinion, of course.