Kinda torn between my first hi-end speaker (Ed Long Time Alignment speakers" mid 1970s)) and Accoustat 2 + 2s ~ 1985. The Ed Longs were my first effort to improve speakers. I took them apart, replaced the OEM internal wiring, 5 coats of borosiliate, then horizontal rod at midpoint to further stiffen the already stiff cabinets, then stuffed with wool)
The 2+2s with the help of a friend who had a spool of OEM wire doubled up the in/out of each panel then to XO and later to the servo amps harness, which several simple mods were done to improve both sound and stability. I also DIYed outriggers to add rigidity and ability to tilt/ I wish I still had them: Good times