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Hi Kokopelli, Thanks for the inquiry. The HDMI cables (sold separately) will only be used if you want to connect external devices like Blu-Ray players, set-top box, sound bar, home receivers, etc. It won't be necessary if you're not going to connect any external devices. Regardless whether you watch from your TV's streaming apps or from an external input, the X77L can deliver exciting content up to 4K HDR resolution. Even 2K pictures are upscaled to near 4K quality with sharp details and billions of real-world colors, reproduced by our 4K Processor X1™. Clear, natural sound brings movies and music to life for a thrilling experience. Thanks and regards -Craig
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