This box works great. My amp is ancient but still works. I used to have different types of audio (analog R/L coax, S/DIF coax, optical) and multiple forms of video (composite single coax, S-Video, RGB coax). The amplifier is from . I think 1990s. does not understand HDMI. My early to mid 2000s TV has a VDI connector, so I had an HDMI to VDI adapter on its VDI input. amplifier along with low quality video sources and I could use the amplifier to switch audio and video at the same time for those low quality sources but high quality video sources, I had to connect video sources to different TV inputs and switch the audio in the amplifier and separately the video on the TV. So I finally gave in and bought an HDMI switch box and where necessary I get blocks to convert to HDMI. In the case of this particular device, its input is the output of the HDMI switch, its HDMI output goes to the TV, and the S/DIF goes to the amplifier. This arrangement works well.
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