[Mike Geike]

Hey,
I too have this problem and so far have not found a solution to it online, however, I have a temporary fix which at least allows me to playback my edited footage in fcp without being disturbed by this nuisance. in system prefs -> sound -> output switch the balance to just left or just right. I know this is by far not ideal but has helped me a lot and is the best I could think of for now…
This is my very first post, hoped it helped someone.
Cheers
Mike