Finally got around to finishing the refurbishment of my vintage Pioneer CS-77a's today. Think this has been about a 4 year project (got put on the back burner for a long time). When I bought them they were thrashed. Refinished the cabinets, replaced a few drivers with donors off of the auction web site, and refoamed the tweeter surrounds. Finally recapped the crossovers today. Replaced a 50, 30, 5, 3, and 0.5uf capacitor in each crossover, and thoroughly cleaned the pots. They're still mid-range Pioneer speakers, but they look awesome, and are now all restored. It was a fun project, even though I probably put more $$ into them than they're worth. 45 years old, and probably now ready for another 45. Both super tweeter horns test OK on the meter, but really don't put out much sound to add to the experience. Wondering if they were more aesthetic than functional on the original design. Wish they were more functional, the speakers seem to be lacking somewhat on the top end...at least for my preference. Surprising level of complexity for a mid-range vintage speaker (crossover especially). Wish they performed as well as they look! Built like a tank, with seemingly well made (but underperforming) components. Think I'll try another amp to see how that pans out. I read somewhere that the CSXX-A speaker series were designed by "S.A", anyone know what the SA stands for???