Hey DeeJay Mixx,
Did you get any further with this?
Although I dont think the sound is quiet, It does sound quite thin on first listen
Ive just received my SX, and one of the biggest factors in my choice was having decent pioneer audio, the standard Im used to with previous CDJ and DJMs Ive owned.
I have this thing running through a pair of ADAM A5 monitors and I think the sound is noticeably thin. Im going to double check its not the 320kbs audio files by finding .WAV Versions.