I am using Pass Labs X350.5 with my Andra 2's.
With the H-Cat as my Preamp, the Pass Labs meter barely moves when it is really cranking out the tunes.Great Match
Great bass, great soundstage, great sound.
Getting the speakers properly positioned is tough beacuse they are so heavy.I placed my Andra 2's 1/5 into the room from wall behind and sides.
They also took a while to break in.