So, the Sonatina IIIs were designed to fix some of the probs with the Sonata and reduce weight. My only quibble with the Sonatina's was on some music I felt there could be more midrange. Low end is very good, but with a bump. Comparing, in the first couple of hours with the X5s, stage height and width are larger than the Sonatinas. Midrange is much better, both my wife and I heard notes from mids to highs that we had not heard before on familiar music. Not trying to tamper too much with the subwoofer amp at this point. PrimaLuna has 32-35 db gain so subwoofer amp will likely have to be set beyond midpoint to match.