Your caps and inductors already cost you a fortune, Minisdsp 2*8HD costs $200 and digital amps are now very cheap many models to choose from.
My experience is that you get what you pay for with those. They have lots of features and tools that are fun to play with. They have their place in the budget audio segment of the market. But they spent nothing on the D/A conversion, output stage, power supply, etc. All of those elements are equal to that of a $50 CD player. So the effect is that the life is sucked out of the music. The sound stage collapses and is two dimensional. It is a harsh, edgy, digital sound that is hard to listen to.
A good quality DAC and a well designed passive network will put the performance in a different league.
This speaker is a world class design that is tough to touch with anything. Adding a MiniDSP would be like using a 8 track player from the 70's as your front end.