Hello Tvad,
That's hard to say. My gut says that the XA60.5 will be enough to drive the Andra II (89dB and 6ohm nom. load?) if the music is not too dynamic or too loud and the room is not too large. But that is a lot of "ifs". My Rosa is not as efficient as your Andra II and my XA100.5 seem like plenty, so they would be amazing with your more efficient Andra IIs. But then again, your room is probably bigger than mine as mine could not support the Andra's woofer. The Eggelstons love power and some Audiogoners use the X600.5 to drive the Andras. I have a small(15'x16'x7.5') room and my "gut" has been plenty wrong in the past. Do you have any way to audition them in your system before committing? There is always the XA100.5 or even the XA160.5, but the latter is getting quite expensive.
That's hard to say. My gut says that the XA60.5 will be enough to drive the Andra II (89dB and 6ohm nom. load?) if the music is not too dynamic or too loud and the room is not too large. But that is a lot of "ifs". My Rosa is not as efficient as your Andra II and my XA100.5 seem like plenty, so they would be amazing with your more efficient Andra IIs. But then again, your room is probably bigger than mine as mine could not support the Andra's woofer. The Eggelstons love power and some Audiogoners use the X600.5 to drive the Andras. I have a small(15'x16'x7.5') room and my "gut" has been plenty wrong in the past. Do you have any way to audition them in your system before committing? There is always the XA100.5 or even the XA160.5, but the latter is getting quite expensive.