Thanks, Albertporter. I just bought these speakers not too long ago, the rest of my gears have been around for a long time. I love the sound of Quad 63 with classical music, but I find it too forwarding when I first got them. I have since put in a pair of MIT MI330 CVTII from Preamp to the Amp and it made a big improvement. The rest of the IC's are all Ameralds (phono and from phono to Preamp). I have been using MIT MH 750 speaker cables for years and I didn't change them with the new speakers. I wonder if the MIT MI330 CVT made such a difference, should I get all MIT IC replacing my old Emerald IC? The loading for the Ruby 2 is factory-set loading, I believe is 49. My Ruby 2 is MC (0.35), but I am using the MM mode on the phono stage, because I find the volume level is not as big between each division on the volume knob. The tubes on my Classic 60 are Tesla KT-88. Power cords on the speakers are just factory power cords.
Musically, I am looking for natural sound of instruments. I don't listen to big orchestral music, just chamber music, instrumental and voice solo. Thanks again.