For a while, I used a KAV-250A with 1.6QR and thought it was a killer combo in a large dining/living room combo that was 24 x 28. Listening in nearfield, the Krell could drive the 1.6 to very loud levels with trememdous bass, a wide, tall, and very deep soundstage and plenty of detail without hardness. I liked it much better than the A21. I have not heard the JC-1 monos. I imagine it will power the 3.6 well too.
Tim
Tim