The FMP-X10 is Sony's second-generation 4K media player, equipped with a 1TB hard drive, access to hundreds of 4K movies and Netflix's 4K streaming service. Previously proprietary, a software update makes it usable by multiple brands of compatible 4K TV.
We've limited the list to standalone streaming boxes, but be aware that lots of other home theater devices are competent streamers these days, from Blu-ray players to game consoles.
Sony's SMP-N100 streaming-video box isn't the easiest to use, but it offers an unparalleled feature set at its price.
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