Thanks for all the comments:
Yes Bret. You are right. I’ve been mastering DVD audio levels consistently higher than recommended for some time with great results. We absolutely avoid peaks greater than zero dB but try to get as much saturation as possible for greater Signal to Noise ratio. Even with Digital there is still a noise floor that is induced in analog portions of the original recording. That includes microphones, mixers, and other signal processing. If noise is constant then the only way to improve this ratio is through the application of more signal in the mix. I personally try to apply a small amount of compression to make my levels consistent. But not enough that it is apparent to the listener.
If you lower your reference tone to attempt to make the audio “street legal” then, although you will achieve that goal, your audio will have a lowered signal to noise ratio. Translation: you have far less dynamic range in your program and your audio will be generally less interesting. The audio may sound somewhat flat.
Although there are FCP video plugins aplenty on the web I find that there are few reliable sources of Audio plugins for FCP so if anyone knows of sources for those “I’m all ears”.
I started off my career doing audio as a studio musician and then moved to video to earn a living wage. Somewhere in there I discovered you can be famous without being rich. But I’ve always retained a keen interest in having quality audio be apart of every video effort.
Onward!
FCP 7
MAC 8 core
BlackMagic Studio Pro
After Effects
PhotoShop
Illustrator
Lots of other Fun Stuff!