UM, I'm not sure if I'm the right person to answer you, since you have two components I find pretty bright, the Triangle and Oppo.
The Luxman's are wonderfully extended and smooth with nothing to prove. They are considerably less laid back than some neutral amps like Parasound. They have more bass than some very expensive American Class A amps.
Given the impedance curve, those speakers are "discerning" of amplifier current. I'd stick with the amp you have, and upgrade the pre.
My biggest concern for you is that listening to them you may miss character you are currently enjoying.
The Luxman's are wonderfully extended and smooth with nothing to prove. They are considerably less laid back than some neutral amps like Parasound. They have more bass than some very expensive American Class A amps.
Given the impedance curve, those speakers are "discerning" of amplifier current. I'd stick with the amp you have, and upgrade the pre.
My biggest concern for you is that listening to them you may miss character you are currently enjoying.