2021 F150 King Ranch. I dont have the speakers in the headrest so I think that rules out the Unleashed system, but how do I know if I have the base or the B & O base?

 

You should have the base B&O system, that is what is in my 2021 KR.

 

One other more obvious way to tell if you have Unleashed is speakers in the ceiling. The headrest ones are so quiet I don't think it's a great measure to just casual observation. But two big disks in the ceiling are a dead giveaway.

But yeah being a King Ranch, at a minimum you have the regular B&O.

 

B&O symbol should be on the door speakers...

 

And on the center channel speaker(s).