I am using the splitter this way. HDMI board in my Denon 1912 has gone bad. I am now connecting the Firestick 4K to the splitter with the HDMI output going to projector and optical/coaxial going to Denon. It gives Dolby Digital. The default is Stereo and you have to press a button on the splitter each time to switch the audio output to Dolby Surround. This is the only negative I have observed so far.