Well, they really were an earful, when used with the passive crossover. Most of these speakers went into cinemas, and were active. Shure made the active crossovers, the SR 106. Going active with the SR 106 improved the speakers enormously.
As it happens I have quite a few Shure 106 crossovers boxed up.
So if the OP wants, I can actually upgrade those speakers for him, and it is a huge upgrade. However he will need two, two channel power amps. I don't know how he is powering those speakers now.