The ZT-AE4K-AD 4K HDMI Audio Extractor is a compact, high-performance solution for separating audio from HDMI sources and delivering it to external sound systems via optical (SPDIF) or analog RCA (L/R) outputs. Designed for home theater, AV, and professional audio-video applications, it supports 4K@60Hz UHD pass-through with HDR and is fully HDCP 2.2/1.x compliant, making it ideal for gaming consoles, Blu-ray players, streaming devices, TVs, and projectors. The unit features HDMI ARC audio extraction (eARC not supported), 5.1 surround sound downmixing to stereo for compatibility with older speakers, and an EDID switch (TV / 2CH / 5CH) to ensure stable audio and video performance across connected devices.