Thanks folks. About the power amp being a key component, especially for bass management - I agree! That's why I have a Krell FPB400cx - 400 watts of Krell bass. What has been shocking is how big a change in the overall character of the sound the preamp made while the amp remained a constant, and how much of a chameleon the Krell amp was.
Great info on the small delta in performance of the LS27 vs. the Ref 5.
Great info on the small delta in performance of the LS27 vs. the Ref 5.