Hi All,
Just to give an update on the ordered Luxman C10x and my personal opinion. I received the new C10x 4 days ago so it have around 100 hrs of continuous use. To be honest, I was expecting an small improvement over the C900u but like thisisme said, I was wrong too. The improvement over the old preamplifier can be easily hear. Improvement can be summed up as much more resolution and dynamics. Therefore, it added better bass resolution/impact, better high frequency resolution, better instruments and voices resonance. Is like connecting my Vivaldi Apex dac directly to the M10x but with a good touches of organic and reality.
I am planning to move up in Wilson Audion speakers series so definitely I also seeing a second M10x in a near future even if it could add 5 to 10% improvements by running them in mono configuration.