@ocstew: Better soundstage would be one benefit of an amp
LOL! Spot on.
The Fiio X3 has more than adequate power for the B3, and they have nice synergy (more than the DX50 IMO)
Agreed. A warmer DAP like the X3 pairs very well with the Havi's.
I use my B3 straight off the X3 and it sounds really good
+1, great synergy between the two.