From the SRS site: How do I uninstall the iWOW trial?
There is an uninstall file in the installer package for the iWOW. If you have already deleted the package:
For iWOW Premium for Mac users: iWOW for Mac can also be uninstalled by going to the Applications/SRS Labs/iWOW folder and choosing the ‘uninstall’ file from there.
For iWOW 2 users: iWOW 2.0 can also be uninstalled now by going to the Applications/SRS Labs/iWOW folder and choosing the ‘uninstall’ file from there.
For iWOW 1.1 users: you can simply download it from the link below and run the 'uninstall' file from there.
http://downloads.srs-store.com/SRS%20iWOW%2011_12255.dmg
If this does not work, you can manually uninstall iWOW by going to the folder /Library/Audio/Plug-Ins/HAL/ and deleting the iWOW file from there.
For iWOW 1.0 users: You can manually uninstall iWOW by going to the folder /Library/iTunes/iTunes Plug-ins/ and deleting the iWOW file there.