The benefit of the Audio only HDMI is that you can use that for output for audio from UHD 4k sources through the HD621 (and other audio processors) that do not support 4k sources.

This means that you can upgrade the video side of things without having to replace existing non 4k audio equipment - a major benefit for those that have existing HD621 devices.

John

808v6, M60, MC200, HD621, Lumagen XE, 504, SB Touch, 563, 201, 204, 208, MPMAX 221, M80, Explorer, Explorer2.