KingOmar wrotewhy don't you get the galaxy s advance?
Only the i9000 series gets the DAC....
Etc, i9000A, i9000T ... (e.g i9003... nope)
S1 (non variant),Nexus S,Optimus 2X : WM8990
S3 : WM1811
Transformer, Atrix 4G: WM8903
(There are other plenty phones that has Wolfson micro chip, but uses indirect implementation)
Now according to my deep research:
Features (Voodoo): 'WM8990 > WM1811'(both same w/o voodoo) > WM8903
Frequency response ::FLAT:: + clarity: WM8903 > 'WM8990 > or (flat) < WM1811'
Max AMP (after voodoo patch): -WM8990 = 10dB
-WM8903 = 6dB (+It can drive 300 ohms headphones with least saturation ;) )
-WM1811 = ?dB anyways > WM8990 without voodoo
Stereo crosstalk + some other specs depends on the manufacturer, RF shilding (PCB), copper quality etc...
* There is no real difference "Features" between the DACs... e.g WM8903 does not have HW parametric EQ nor hardware SRS...