SRS Labs is famous with its virtual 3D sound technology. It can be found in home entertainment, mobile devices, cell phones, car audio, headphones and computing. There are 3 SRS solutions for mobile devices ~ TruSurround XT, WOW and WOW HD.
SRS WOW HD is a suite of different audio solutions and a custom-designed mix of technologies that restores natural-sounding audio, making it closer to the way it’s supposed to sound. With it, you can have immersive 3D audio, improved bass, elevated sound and high frequency clarity.
SRS WOW HD v22.214.171.124 is working perfectly on HTC HD2. Just make sure that you soft reset the phone after install it. Not sure it works on other Windows Mobile devices or not. You need to try it at your own risk.
Download SRS WOW HD v126.96.36.199 here.