FCPX audio is 6 db different than Adobe Audition

I'm seeing a 6 db difference between audio playing in the FCPX timeline and the same clip playing in Adobe Audition. Audition has it at 6 db louder. So I guess my question is, which is the accurate one?, and assuming that Audition is accurate, is there a problem with doing your initial volume levels for a film edit in FCPX and then once you take the film project over to Audition, will you have some of the clips actually clipping?

For example, imagine you cut a scene where an actor is screaming. Maybe you bring the audio up to -6db while working in FCPX. Upon transfer, will it be clipping in Audition? Obviously you could adjust that actor's level down in Audition, but now the relative volumes of that actor compared to other sound in the scene is off. So assuming Audition is the true volume, can you merely do a global volume/level decrease by - 6 db, on all clips, as you begin your Audition session, and would that keep all the sounds the same relative to each other?

Would also be curious if anyone heard anything from Apple on this issue? The problem also affects loudness of a clip in FCPX browser vs timeline. The clip in timeline is 6 db quieter than when same clip is played in browser.

Thanks,
Matt

Read this :
support.apple.com/en-us/HT204261
" Adding 3 dB of gain now compensates for 3 dB of downmix attenuation that occurs when you eventually share this project as an MXF file."

Thanks for attenuation tip, but I was doing this with XML created via X to CC. But, I may have found answer to my question: as I used X to CC to bring FCPX project into Adobe Audition, it was duplicating all stereo clips, yielding 2 clips in Audition(on separate tracks) for each one in FCPX. When I deleted one of the duplicates, the db level in Audition reduced by 6 db and matched the FCPX db level. The duplicated clips were labeled separately as left channel and right channel. I deleted the right channel to fix db issue, but the clip still played with meters showing left and right channel levels and sound came out of both left and right speakers, so assuming all is good here. The good news is that the timeline db level is the one that is transferred over via XML, and not the browser, so your timeline volume level adjustments should be accurate when you go to Audition for proper mixing.

Small note, mono clips came over into audition without being duplicated, but they too were 6db higher, so I figure I can just manually adjust those clips down by 6 db upon importing XML to Audition.

Problem solved for those experiencing FCPX files playing 6 db louder in Audition. I was using X to CC (formerly Xto7), and that was bringing the files into Audition at 6 db louder. I spoke with one of guys at X to CC producer Intelligent Assistance and he recommended taking the X to CC converted XML into Premiere, and then taking that into Audition. That did the trick.

Note: This was the first he had heard of X to CC having this issue for people going from FCPX to Audition via the X to CC software, but for those with the problem, go to Premiere first and you're all set.