AkustiX, an enhancer plug-in for Mac and PC. Here's what they have to say:
"AkustiX Enhancer is available now! It’s a collection of six essential enhancement tools combined into one intuitive user interface. Ideal
for tracks as well as full mixes AkustiX features six powerful effects:
Psycho EQ, Ultra Stereo, Phase Enhance, Multi Exciter, Smart Filter and
Stereo Width. Each effect is based on the latest developments in
research and offers multiple ways to enhance the sound of your
recordings drastically by using psycho-acoustic processing. "