I'm testing out the FLAC file format. Using 24bit 44.1k in both wav and flac to compare file sizes,
For file size, the FLAC files come out 85% the size of WAV files.
For sound quality, playing the FLACs on X3 gives very good results. Very clean and smooth sounding.
Maybe not quite as loud as the WAV, a slight difference.
I'll send you a PM with links to the files. Please to download and test the veracity of them.