The mechanical issues are real and worth improving upon.
However, I believe the far larger issue is the interaction of the crossover components with the fields emanating from the driver(s), especially the woofer. These interactions and their sonic effects are not subtle. I had previously noted here that the CS2.2 qualities of 'hoodedness' and bass-transient overload (which sounded like a hard, mechanical splat) went away when taking the XO out of the cabinet and spreading out its components.
The present experiments on the SCS4 move the XO network from a densely packed panel on the back, behind the coax (in a high EMF bath) to either A: outboard with same layout, for testing, or B: split into separate woofer and tweeter boards, mounted on edge with shock-mounts on the cabinet bottom. EMF is more than an order of magnitude lower in the new location, plus mechanical vibration is reduced to near nil - and throw in qualitatively better thermal management for kix.
