ESE Lab Nibiru v3.0. I owned the battery powered version (v2.5) for seven years and sent it for the upgrade (v3.0) about two months ago. The upgraded unit has circuit changes and is now mains powered using a "virtual" battery.
I was very happy with the v2.5 sound but frankly the v3.0 is astonishing. To my ears there is a large step up in resolution (low level detail), better dynamics and better tonality. This gives great insight into the music. I hear how the guitar (John Fahey!) is being played - I can almost feel the tension in the guitar strings. The Nibiru uncovers intense detail, and the separation of musical strands is stunning, but still retains the musical whole - it has great focus.
I was very happy with the v2.5 sound but frankly the v3.0 is astonishing. To my ears there is a large step up in resolution (low level detail), better dynamics and better tonality. This gives great insight into the music. I hear how the guitar (John Fahey!) is being played - I can almost feel the tension in the guitar strings. The Nibiru uncovers intense detail, and the separation of musical strands is stunning, but still retains the musical whole - it has great focus.