HI :) i was just passing on this site when i saw your issue i registered. you are lucky :D cuz i had the same issue like you for a long time tell i made my galaxy S3 sound a hell lot better than my HP laptop.
first from my experience software EQ and players like noozxoide, poweramp ...etc wont really change SQ that far cuz they are just editing a software equalizer , so it will give you a placebo effect not a real better SQ . (that's why sometimes after u install a new EQ or a player you think SQ became better..... but the moment you compare it with another pc or laptop you will be shocked again and again :( just the same way it happens to me over and over)
my point is that if your laptop SQ is better than your phone with the WM1811 , this doesn't mean that the laptop sound card is better .
it may be like this because the stock software came with your galaxy S3 is limiting the WM1811 full potential , but with the right tweaks i am going to explain here, your WM1811 well be tuned to a real better SQ as if u are hearing the music from a more superior device :D (btw your device must be rooted)
it took me 1 year to play with all different kernels , players , sound mods until i finally found the right combination of these mods to enhance (loudness , sound stage , clarity + activating true bass(hardware true bass) not software level ;) . all changes came with these mods will enhance you hardware sound chip quality .
follow these steps carefully :
1) root you phone
2) Download Syiah kernel 1.9.1 (also download "Stweaks" from playstore to controll the kernel features)
3) Download Acid audio mod Samsung optimized (it replaces stock sound lib and drivers with a better tweaked one)
4) download DTS audio enhancement ( gives you true WOW , true hardware Bass , true SRS )
5) download Walkman player ported from sony xperia Z ( or any player you want , for me i think walkman player is better fro clarity and cinema dolby effects)
before you flash these files make sure you WIPE CACHE and DALVIK CACHE first :)
if u donno how to root your device or how to flash zips just ask me and i will explain in details
seems a pain in ..... i know :D but will spare you more painful ways and time waste in trying to change SQ with EQ and players from playstore.
here is the links:
http://d-h.st/vNM (syiah kernel thanks to "gokhanmoral" the kernel developer)
http://www.mediafire.com/download/3eapg03tovsiv4l/%5BSamsung%5DAC%21DAudioEngine%5Bv5.0%5D_signed.zip (acid audio thanks to "TEAM AC!D")
http://www.androidfilehost.com/?fid=23050663588004852 (DTS audio thanks to "Zero infinity" developer of the mod)
http://d-h.st/QMM (sony walkman player thanks for "Ravi" for the galaxy s3 port )
here we go , have fun :)