GIGA BASS™
This is much more powerful than Mega Bass™. I've tested it on my K750i.
Download:
BASS Acoustics
VKP Patches
settings.xml
1) Apply a vkp patch to your phone.
2) Upload settings.xml to /tpa/system/multimedia/mp/
3) Upload one of this Bass acoustic drivers to your phone:
APF
-hyper_THUNDER_acoustic_V7
-RaKisTa_f1naL_MonsterBass
-TVH_BASS_EDITION
ZAPF
-HYPER_DRIVE_V2.1
-Peter's v2 K800
-Peter v2 [HiFi]
4) In media player on your phone set Equalizer settings to "Bass". Listen to music on headphones.
Useful links:
Flash your phone and How to apply or remove patch using SETool 2 Lite - Top Sony Forums
XS++ 3.1 Guide-Flashing,Customizing,Recovering - Top Sony Forums