LUXMAN L509X VS M700/C700U

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.

Thank you Erik 
I also have an eastern electric dac but it had some crackling sound in tweeter so I stopped using them 
will taking out Oppo and introducing c700 soften things up or other option is to get tube preamp

I think the C700 will be transformative.

The  C700 would be the natural addition. One other option would be the Luxman CL 38U-C tube preamp and match it w/the 700U. I have the Cl38U-SE w/a Bryston amp and it's an excellent combo.