Adcom 565 vs Emotiva xpa-1

Deciding what pair of mono block for a Biamp- lowend situationCrossover at 200hz, 90 db efficiency. Tube monblock Highs.The Adcoms are decent as I loaned out  a pair years ago and put them side by side with a Krell Ksa250  driving B$w 801#3.  Only thing the krell exceeded in was a less metallic.returned the adcoms in 2 hours, as I found out what i needed to know, In sane impedance loads the 565 Dittoed... the krell...