Using HDMI to get 4K 60hz into my 4K screen seems will be ok, but what about the 5.1 surround sound? I only want the 60hz, max 30 at the moment. Currently my 2014 Mac Mini outputs 5.1 surround optically through the 3.5mm jack directly into my 5.1 amplifier. It’s not clear whether the new Mac Mini does this. The only mention of surround sound is through the HDMI port. Checking my Sony 4K TV, there are lots of in/out sockets. Most of which I’ve never used. One is optical sound out... So, maybe, if I feed HDMI video and audio out of the new Mac Mini into the Sony TV, the TV will feed my surround sound amplifier via the special optical out socket, (which may use the same cable I use currently?) Any thoughts?