I have the Silverbacks in my reference system. They are the best overall multi-driver speaker I have heard at their approximate price point and below. I have heard them with both SS (Nagra, Audio Research, Luxman, Naim) and tube (Shindo, Leben, Luxman) gear. Although they sounded great with all of those, I felt they sounded best with tubes, particularly Shindo. I am currently running them with a Shindo Masseto pre and a Luxman MQ-88 amp and just love the music they make!