Hi booboobaer,
Henry is a friend of mine and lives nearby, so I have auditioned the Fire preamp in my system. I very fine preamp that bettered my Ayre K-1xe in some ways. The problem was the it was SE only and my Krell amp (in my system at that time) only has XLR and CAST inputs, thus requiring XLR to RCA plug converters at the preamp end. This created an audible 60hz buzz. What I heard in a week long audition was very promising, most impressive was its lively sound, rich tonality, and delicate & detailed upper treble. The buzz was not the fault of the preamp, but the limitation of the Krell with a SE preamp, yet obviously not something I could live with long term.
Best to you,
Dave