Film Mix Problems

Okay,
I just finished a mix for a feature length film using Logic Pro, and the Director of the film imported the 24 bit 48K AIFF files into Final Cut, in order to fit the audio on a DVD he had to compress it using AC3 which apparently is the Dolby Digital compression. The problem is, something happened to the audio, either when he imported it into final cut or performed the AC3 compression, specifically, the high end was boosted, and/or the mid-range was reduced, and the bass seems like it was slightly reduced. Maybe the bass seems like it's been reduced because the high end was enhanced, but it definitely sounds as if the mid-range has been lessened. Also, we separated the film by Act so I had to give him 4 audio files for 4 acts, two of the audio files purposely overlapped, so when he exported the audio in Final Cut, he chose "Channel Grouped" rather than "Stereo Mix" on the export of the audio, with the Channel Grouped feature, is Final cut summing the files, if so, does it have a weak algorithm that is responsible for what I'm hearing? Or is it the AC3, a little bit of both? Has anyone had this problem with importing files into final cut, or compressing them with AC3? Any fixes?
Power Mac G5 Dual 2.3 4 GB Ram Mac OS X (10.4.6) MOTU 896

i've never heard of those problems.
AC3 is fairly standard compression to be muxed into mp2. my guess is the channels he put your audio files on had some mixer and eq settings that he had forgotten about. the other thing you need to check is the settings for the AC3. what bit rate did he use? i think for DVD it is supposed to be 224 kbps. considering mp3 sounds great all the way down to 128 i wouldn't have thought it a big problem.
the final audio is stereo on your film so obviously FCP is summing them. but this kind of digital summing won't cause any problems. your issues are elsewhere.

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