2020 Subaru Outback Premium
I have installed the Key in my 2020 Premium as well. Kicker EQ on works fine with the factory HU.IMPORTANT NOTE!!! THE FACTORY HEAD UNIT WILL NOT WORK IF THE KICKER EQUILIZER IS SET TO ENABLED!!! YOU WILL LOOSE ALL CONTROL FUNCTIONS TO THE FACTORY HEAD UNIT AND STEARING WHEEL CONTROLS...
When I first set it up, I had an issue where volume control wouldn’t work from the HU or steering wheel. I disconnected the battery for a few minutes and reconnected and everything worked fine afterwards.