If you use your Windows Mobile 6 device for listening music then SRS WOW HD is a must.The SRS WOW HD software enhances your audio to make it sound best through the speaker or the headphones.

Copy the .cab file on your device to install it and after install you can access this utility from Setting > System > WOW HD settings.

I have tested it on Windows Mobile 5 and Windows Mobile 6.It works perfectly.