Check that the WHITE Thunderbolt cable is plugged into the IMac

 
Make sure the other end of the WHITE - Thunderbolt cable is plugged into the Blackmagic Design Intensity Pro as shown here.
Log into the computer 


Go to System Prefs



Go to Blackmagic Desktop Video

Click on Settings Button

Click on Video>
Choose Video Output > Select Component and choose 1080p23.98

Click on Audio Tab > Click on RCA

Click on Save

Select Sound

 

Select Output Tab > Blackmagic Audio

Select the application that you want to run AVID or Davinci Resolve or Premiere

Choose "Premiere Pro CC > Preferences > Playback..."

Choose Blackmagic Playback

 

Click OK

Choose "Premiere Pro CC > Preferences > Audio Hardware..."
Make sure you Preferences look like this
If you get this error click Yes
Click OK 

Don't forget to pan

channel 1 LEFT

&

channel 2 RIGHT

and don't use any other tracks

USE ONLY TRACK MIXER

not CLIP MIXER

To hear audio on the speakers

 

 

Press the INPUT SOURCE SELECT - EX AVID

MONITOR SELECT = A

TURN UP THE BIG KNOB FOR VOLUME