Check the connection from the Thunderbolt 3 ADAPTER from the computer TO the Thunderbolt cable from the Blackmagic Intensity
This is the Blackmagic device that delivers audio and video to the Plasma Monitor you can't see this because it is in the A/V rack hidden FYI
Turn on the OLED using the Remote – Make sure it is set to HDMI 4
On the Mac Go to your System Prefs
Select Sound
Select Output Tab > Blackmagic Audio
Setup the PreSonus Monitor Station
Select the application that you want to run AVID or Davinci Resolve
You should see both image on the OLED and Audio coming out of the speakers.