I wouldn't call a 30% reduction in filesize on average (when working with 16bit 44.1kHz stereo) not a big difference.
xD Yeah... I thought in small amv dimensions.
Yeah, well trying to do 48kHz 24-bit audio doesn't compress much at all - I got maybe 10% shaved off at the most - usually it was between 4% and 5.6% (the material was the stereo version of Bon Jovi's Have A Nice Day
on the DVD-Audio part of the DualDisc edition - the process of actually getting it into wave in the first place is a pain in the ass; and by DVD-Audio, I don't mean the audio stream of the normal DVD, but the contents of the AUDIO_TS folder). I have no idea how it performed on the Surround copy from the same disk, as I wasn't monitoring it while it was encoding. Needless to say it didn't compress as much either based on the resulting filesize. In both cases the original MLP streams were more efficiently packed, and I use FLAC on level 8.