The Fire TV Cube has one input HDMI port, in addition to the typical output HDMI. It can be used to plug in a cable box, game console, or other device, and display an Alexa overlay on top. As pointed out by AFTVnews, Software version 7.6.1.3 (PS7613/3686) adds support for DTS, DTS-HD, and Dolby True HD audio passthrough on the HDMI port. That means if the device connected to the Fire TV Cube supports one of those audio standards, and your TV does too, you won’t lose any quality through the Fire TV Cube anymore.
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Source: AFTVnews
