Luxman 590AX II Break-In

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.

I use the L-590AXII with speakers that have a sensitivity ranging from 87 to 88dB, impedance 4 and 8 ohms. Room is 10.5 x 18.

If the entire system is new, how do you know the amp is causing your dissatisfaction?  It could be anything. 

My Luxman 590 took about 500 hours BUT a few tips….PLUG IT DIRECTLY INTO A WALL SOCKET! It hates any power strips or conditioners. You also need a bigger power power cable for it like a Kubla Sosna Elation! Mine was $2500 at GTT Audio. 
I tried 5 power cables on mine from Shunyata Delta and Alpha and Voodoo, DH Labs Red River, the crappy stock cable and an Ansuz D that was about 8-9k! 
The Kubala Sosna had the best synergy full stop!

The bass is lean, defined, layered, detailed and taut as opposed to loose or full. To me it's quality bass. 

@ryder I agree. A loose and full bass can sound as there is more bass but it’s not quality bass.