Not heard the Aelius but was lucky to hear a full suite of Ypsilon inc SET-100 mono's driving Raidho C1 monitors in a small room. Breathtaking, as good as I've heard anywhere. If that experience was anything to go by they'll be well worth seeking out for audition.
Ypsilon Aelius monoblock
If I were to judge micheal fremer review on ypsilon phono , ypsilon seems to produce phenomenal products. I like what I read about the spec of aelius mono block ie first 60 watt class A which is probably enough to drive most speakers ? However there is hardly any discussion or reviews on this mono block . Spec and performance in real life may differ vastly. Your feedback is much appreciated