I just got a 400xi in my system this week. I haven't heard it in my system with another source, but it does sound very nice with the JD100, and Maggie 1.6s. I also replaced the 12AX7s in the Jolida with RCA 5751s, which are even more laid back than the 12AX7s.
I did hear the 400xi at the dealer's in single ended/RCA mode and in Balanced/XLR mode. XLR was louder, but I couldn't tell if it was better or not.
Good luck
I did hear the 400xi at the dealer's in single ended/RCA mode and in Balanced/XLR mode. XLR was louder, but I couldn't tell if it was better or not.
Good luck