If you have planar ribbon tweeter your going have a reduced sound stage domes they are just wider dispersion. As for as capacitor go Solen are bottom of the poly barrel. If you have a tube preamp you will have a wider sound stage. My system is all FETs and MOSFETs and provides a sound little more tube like as related to sound stage. Caps like TRT, Dyna Cap, and other metal foil polypropylene have a much improved dielectric absorption but expensive.
I have this Golden Ear Center speaker it’s very clear but 30 degrees it’s output is very low. So borrow some speaker with out Ribbons and see if that does not help your imagining.