I'm trialing Amarra on my system (iTunes with Apple lossless on a hackintosh, Music Streamer II, Matrix M-Stage Headphone Amplifier, and HD600s).
My issue is, after careful listening, I can't tell the difference with Amarra on or off. They sound exactly the same in both cases.
Some explanations: there is something wrong with my ears, Amarra isn't actually switching on, or with the setup I have Amarra just doesn't improve it (though you'd think I'd at least be able to hear a difference). Any suggestions?