With my Ref 3s, I'm using a BAT VK-60 (and the Gallo sub). I agree with the prior post with regard to power requirement of the Ref 3s. The VK-60 is 60 wpc and is more than adequate. I am using the 4 - 6 ohm taps. Rumor has it that the Manley Snappers are also a good match for the Ref 3, but I have not heard this combination. The Snappers are optimized for a 5 ohm load. I suspect that the Ref 3s are actually closer to that than to 8 ohm.
