As I'm posting this, I am assuming that Maggie owners have brains. Every one of these guys I know are good!
The biggest single source of SQ degradation in Maggies are the protection fuses. I get it. Fuses save stupid people from speaker grief.
IF you are a Maggie owner with a brain and restraint, I encourage you to try a pure copper element in place of the fuse. Fuses are 5mm. You can get OFC copper bar stock from McMaster-Carr, you can order copper foil tape (works great) or you can throw caution to the wind and get a short piece of 1/4" copper tubing from a big box store. Slightly springs the fuse holders, but who cares?
Oh, yeah. Put a good polish on and contact treat the appropriate "slug".