Mohano, my brother is using 2 Pass First Watt F3 bi-amping his Avantgarde Unos. 1 for the horns and the other for the sub. 1 amp is sufficient but 2 is a very nice improvement ... more headroom, ease to the music, more detail, open ...
XA30.5 SHOULD work with your Duo's ... good luck!
XA30.5 SHOULD work with your Duo's ... good luck!