Maybe it is not feasible at first glance but it makes sense especially that in my opinion quality of bas from internal class D amplifier is not as good as from external amplifier.
I see also that current top speakers Monolith have passive bass module what is a sign for me that solution with internal class D amplifier is not excellent solution.
Question is if there is someone who think in the same way and had the same conclusion and question how to bypass internal amplifier. I think that the main difficulty is that Summit have two bass speakers what causes an issue how to combine it with the panel in terms of phases... I am very interested in any ideas how to use external ampliefier instead of internal, even if it is difficult and needs a big effort.