Problems with ac3-audio not encoded in apple's compressor

Hi everyone,
I'm working with DVD Studio Pro 4.0 and when encoding audio with the compressor into ac3, there were hardly any problems.
Now I have to get along with external ac3-files, not encoded with compressor. Settings, format etc. are identical to the compressor-created files; despite of these similar settings, I now expericene a very low sound (about 3x lower), not comparable to the volume of the compressor encoded files.
Has anyone an idea on this subject?
Thanks.
Greetz
Power Mac G5 Dualcore2Ghz Mac OS X (10.4.6)

You might get better responses in the DVD Studio Pro or Compressor forum?

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