ARC 160s and Serafino’s are a great match. I preferred that amp over they Gryphon Diablo 300. I also had an REF 75SE for a while which was my first taste.
BTW - I’ve had nothing but stellar response from Audio Research for all services.
I’m now running the ARC REF 6SE into the 160s with a pair of Sonus Faber Maxima Amators. I’ll let you know how they are compared to the Serafino’s.
good luck….!