I have some .mp3 files that I want to edit. When I convert to .wav and convert back (even if I have not edited them), the files are significantly smaller than the original files using the default setting on the Acoustica Audio Converter Pro. If I use a third party converter in the wav editor such as Creative's Wave Studio 7 or Audacity 1.2.6, the reconverted files are smaller yet. Note: I tried the highest setting on the Acoustica Audio Converter Pro and ended up with a larger mp3 file size. Why does this occur and what effect does the smaller output file have on sound quality?
Examples: original file 9106 KB, Reconverted Acoustica Audio Converter Pro default setting: 6700 KB, Audacity reconverted: 3890 KB. Reconverted Acoustica Audio Converter Pro highest setting: 11155 KB.