I just realized these have 5" bass units. I’ve never seen a speaker with a 5" bass unit that did well.
I’m listening to 2 ways with 6.5" bass drivers with my Luxman 507ux and having a very good time. Maybe you need Fritz speakers instead. Call him, last I heard he had a Luxman integrated as one of his test amps. Worked great.
Note that I am output limited here. If I want high bass I simply need to add a sub, but the bass is still tremendous for the size.