Luxman leaves me wanting

Thanks for all the helpful suggestions. I’m pretty familiar with a lot of gear talked about on this forum, but haven’t heard of Sinthesis. I will look into them.

i do use Roon, but have not tried the EQ filters or room correction - but that’s a great idea. I’ll start there. I have thought of adding a tube pre to my L590AX-II, and am glad to hear that hsounds had good results doing so.

Two years ago I wanted to down size a little by going from separates to an integrated amp. After a couple of months of research, it was down to Luxman and Hegel.  I ended up buying the Hegel H390 to power my KEF Reference 5’s. The Hegel is quiet. The Hegel images well and gave me good separation. The bass is full, the midrange is clean and the high end is actually very pleasant as well. 
Hegel just replaced their flagship H590 with the H600, so they are discounting the H590’s to about the same price as the H390, until inventory is gone.

You should look at the Aesthetix Mimas Integrated amp, which is a hybrid amp. Based on your post it just might fit the bill. Good Luck!

  I am not a tube guy so I cannot offer much assistance other than referring you to the article below where the reviewer indicates a synergy between your DeVores and the LTA you are looking at …and to offer that in my experience the environment impacts tonal balance as much as the electronics. I would also experiment with environmental treatments and speaker placement.  

I think your cables may be part of the problem as well. I found Luxman gear to be quite sensitive to cable choice, but also easily satisfied with the right choice. In the affordable range, I found that the lowest tier of LUNA cables really brought the Luxmans to full glory. They add density and palpability and increase the analogue-y-ness factor.  As you go up the range, you get improvements, but the base power and interconnects work really well.