spenav BACCH just makes some weird stuff in my system. If the musicians are placed from L to R there is not the samme L/R placement in front of me with BACCH with some songs, with others it´s a little better but still to my ears its a no-go aka I just don´t like what it does. The FEQ preserves the stereo image 100%, and pushes it further into the room. It now stand full detached from the speakers. It´s impossible not to be impressed, the whole room now is filled with the same L to R music as before, just more open and like you can walk into the scene of the recording. I NEVER have heard anything like this. My walls disappear and everything is energized with music. Very impressive. Regardless of which genre of music, it just makes EVERY track better.