? about volume settings and decibels

ive been importing some mp3's to iTunes and then converting them to AAC files. but once i convert them, i notice the AAC files are quite a bit quieter than the original mp3's. ive been using AAC encoder at 128kbps under the High Quality Settings.
heres an example: i just converted a mp3 of 96kbps into an AAC using the high quality settings of 128kbps. now i have sound check on, and for the original mp3 file under Get Info it says Volume -5.8dB.
The AAC says Volume -8.3dB. I listenend to both and heard that the AAC is QUITE a bit QUIETER than the mp3.
if AAC is supposedly better then why is it quieter than the LOWER mp3 settings? Basically, the AAC file is quiter but bigger in size?
Does anyone know why the conversion is liek this or what those Volume settings i mentioned about mean?

I don't have any comment on the "volume" issue, but in general I advise against converting from one format to another unless absolutley necessary.
Since the original file is MP3, it's alredy been compressed - meaning audio data has been discarded in the process of making the mp3 file. Converting to AAC means another run through a compressor, and therefore even more lost data. The file will not sound better than the original, it's technically impossible.

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