BK, I will disagree with you. I'm in the US. PEAKS at -6 to -10 are what I want to see on a camera for dialog. Relying on RMS is NOT the way to go. The PEak to RMS ratio from one person to another varies greatly. If you want to stay out of clipping, PEAK is the only level that matters.
0 referring to the audio inputs on cameras. If you have any cameras with audio meters that read over 0, please forward them to the Smithsonian.
I once had a "camerman" come to me with his Z1 that was distorting, he had lined up the 0 line level tone from his SQN mixer to show -18dbfs on the meters but what he had failed to do was change the switch from mic to line level so he was basically feeding 0.775v line level into a mic level input but as the meters showed the correct level he assumed all was well.The resulting audio was nicely square wave as the line level overloaded the mic amps and potentiometers.
Yep! The weird thing for most people, is that they can look at levels that look OK on meters, but that are horribly distorted, just as you describe. You might think that if you fed line level into a camera set to accept a mic level signal that there would be no way you could turn the camera inputs down enough. Unfortunately, it just doesn't work that way. And, after you simply switch the camera to line level, you have to recalibrate the mixer to the camera.