The SEK-2500U demonstrates the genius of Samsung's One Connect Box design. Physically, this box is virtually identical to the version that came standard with F9000-series Ultra HD TVs.
The F9000 models do a great job of upconverting HD content, like Blu-ray, but aren't compatible with 4K sources that have become available recently. The SEK-2500U updates the box's digital connections with four HDMI 2.0-compatible inputs.
The box's innards now include HEVC decoding, which is necessary for watching streamed 4K content from Netflix® and other video services. And there's a designated USB input for connecting Samsung's UHD Video Pack 4K media player (sold separately).
Last, but not least, the SEK-2500U houses a more powerful Quad Core Plus processor that runs about twice as fast as last year's version, for speedier web browsing and app multitasking.