Specs say spl 99 efficiency.
current amp far more power than needed.
the speakers have a dual range equalizer, which I presume you have used to adjust sound in their location.
I would want tubes, I like 30-45 wpc which is plenty for them. height clearance of the shelf? open space above and at sides? ability to drill holes in shelf above, let heat ’up’? shelf in location to receive infrared remote control signal?
My current home theater cabinet, I made a floating back, look thru see dark space and matching wood like cabinet (not white wall behind). however the back is floating 2" behind, hanging on two blocks: cables, heat flows aplenty for anything/everything in there.
Equipment: Integrated Tube unit perhaps, I definitely want remote volume. I could care less about remote input selection. I like remote balance, I find some tracks benefit a lot from a small balance tweak, and adjusting from listening position is a treat.
Another way to minimize size of amp is to use tube mono blocks with a tube preamp with the features you want. split the heat into three locations.