Martin Logan Quest Z Bass - can it be fixed ?

Great analysis Drew_eckhart. Didnt the ML Prodigys have a push pull dipole-like woofer or am I mistaken?

Adding a sub makes it worse. It's a phase coherence issue.
The "speed" of the panel and that of the cheap cone are vastly different.
Tried it before... biamp, muscle amp, cables, you name it.
They play certain things right but once it gets to bass integration they fail miserably. Use a muscle tube amp to drive them and you lose the finesse of the esl panel.
Of course back in those days I didnt know how to mod crossovers.
This crossover would involve a lot more than cap swaps.
Anyway need to know what sonic signature you are after and what amps you have. You might be better off getting a Thiel 3.5 for cheap and replacing a cap or 2 in the crossover.

you must protect the panels from bass energy.
Drive full range = disaster.
YOu may disable the woofer and custom build a woofer for it.
The SL3 is the most successful in mating a relatively quick woofer for the panels.
Not so with Quests and Monoliths.
Crossovers can be fixed with better resistors and better inductors to give it more speed and make it less lossy.
Very very involved work with lots of listening required.