Hmmm…there’s not really much in the way of import settings to adjust. I haven’t changed any options from defaults, although in one test, I checked the first 2 of the 3 Audio checkboxes (“Analyze and fix…” and “Separate mono…”). Same result.
To be clear, the clips play back fine *IN* FCPX. It’s the QuickTime Player and QuickLook playback that’s affected. And it’s only DV, not HDV. Are you saying your DV clips play back w/ audio if you do File > Reveal in Finder, then press the spacebar to invoke QuickLook?
Thx,
Fred