Luxman 590AX II Break-In

As a basic test, and to get a base point for positioning your speakers, go to the Cardas site and put the room specs into the calculator and try repositioning the speakers using that first.

Its by no means a perfect solution, as there are so many variables in a room, but it will get you close to a decent set up.

just a thought.

Similar set up to you. I have a 30W Class A amp (DIY Hiraga Super 30 W), which is driving a pair of Seas Coax book shelf speakers. (DIY Sealed 5Ltr enclosure using the C16N001/F driver - Seas recommended enclosure and crossover) Room is 12,x18’ approx. I’m having no shortage of bass with this small box. Low watt class an amp, small coax driver. With those 3 way speakers, you should get a better bass response than what I’m seeing. 
 

Have you tried running a 50hz tone sine wave through your set up? You may want to try doing that (can be streamed from YouTube) and walking around in the room. Bass nodes will become very apparent and might help in getting the speakers properly positioned in the room.

just a thought…