Hear Your Music for the First Time

Subband Technologies  OSS3D
OSS 3D greatly improves audio quality in movies and music throughout all of the OS X applications. It provides non-destructive spatial expansions similar to Spatializer or QSound, with additional functionality of Speaker Resonance Correction, Virtual Subwoofer, Automatic Gain Control, Brainwave synthesis, High Frequency Restoration, Center channel control, and more. Also included a studio quality N-band equalizer with built-in peak limiter.

I've used SRS WOW! for some time now on Mac and Windows iTunes but this sound enhancement application blows WOW! out of the water. It works across the board on all your apps, enhancing any sound output. Rather than trying to convince you I'll just say this, give it a try for 30 days, free. If you have the same experience I had you'll do what I did and cough up the 30 bucks (£14-95) within minutes. Wow indeed!