Luxman 590AX II Break-In

Wow!  A 40 kilo DAC.  Cool.  I run the Luxman 509X on some demanding ATC 20s and it is still breaking in after 100 hours.  I can read, you are beyond that.  

Your pieces are in order.  Cabling and power conditioning not mentioned.  One can only assume all of that is commensurate quality.  That leaves more break in and room treatment.

Hope you successfully resolve all issues.

My 590II took only about 200 hours to really fill out. I love the way it sounds. I agree with others to play around with speaker placement, room treatment. I also found that music that has been compressed or poorly recorded sounds even worse with a revealing system such as yours. 

My 590II took only about 200 hours to really fill out. I love the way it sounds. I agree with others to play around with speaker placement, room treatment. I also found that music that has been compressed or poorly recorded sounds even worse with a revealing system such as yours. 

I have about 175 hours, and my bass is less than stellar. Also, there is not a luscious midrange (yet). I have read epic reviews but have not experienced that thus far. What should I expect over time? Getting a little worried!

The L-590AXII although a Class A amp sounds very close to neutral. In other words, it won’t give you an overly luscious, syrupy or glowing midrange that some tube amps are capable of. The midrange of the L-590AXII sounds smooth without any grain if compared to other solid-state amps but it won’t sound like a tube amp with glowing, warm or lit midrange.

The bass of the amp will be dependent on the type of speakers and room. The bass is lean, defined, layered, detailed and taut as opposed to loose or full. To me it's quality bass. 

Kef Reference 1 Meta speakers,

These speakers have a low sensitivity and impedance. I6 x 18 room is rather large and that might have contributed to the less than stellar result you are currently getting with the speakers.