Sorry for the confusion:
Ok, Efficiency and sensitivity are not the same. My speakers are JBL 4435 monitors and have a sensitivity of 96 dB SPL @ 1 watt @ 1 meter @ 8 Ohm their efficiency is 2.7%. See the JBL manual below specifications last page. As for idle current consumption for Schiit Ragnarok 2 I don't know what that figure is my guess maybe 75 watts quiescent. As for the difference between sensitivity and efficiency see the link below JBL technical note first page sec;c. Hope that helps. Mike
http://www.lansingheritage.org/html/jbl/specs/pro-speakers/1984-4430-35.htm
http://www.lansingheritage.org/html/jbl/reference/notes/tech1-3a.htm