Luxman 590AX II Break-In

Make sure you have plenty of space to the side walls. I should have stated, I have the 507ux which is not class A, but it was always a stellar performer from end to end.

I am really concerned you have too much treble in your mix.  The tone controls on the Luxman pre-amp section really are superb, don't miss out.  Try them!

It is not unusual for a couple hundred hours to be required to get in the ball park of what you will hear in the future. But, to be honest, your speakers require a lot of power, 85db efficiency, and the Luxman you have chosen is outstanding, but of very low power. Not a match made in Heaven. 

The 590 isn't low power. It will put out 90w/channel into 8 ohms, and 160w into 4 ohms. It's not a monster amp, but it's more powerful than Luxman's specs would suggest. Wish I had anything else to offer.

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.