A spike through Linn Kans improves them to my ears...:D Works for the undead apparently too...
Always thought the 2075's would be good one to try rebuilding the crossovers with better caps and replacing the tweeter with something better. They will likely be full of ancient "Elcaps", thin wire and push on connectors....
My mate used his with a Sugden A48II and they still sounded great! Effortlessly extended bass with decent grip but a bit of a sting in the treble is how I remember them...