100Ws, with walnut cabinets and tweeter level controls. The others are 100Vs, with woodgrain vinyl cabinets and no tweeter level controls. I replaced the single capacitors in both pairs. The difference in the 100Vs was huge and immediate. The difference in the 100Ws has been much less apparent. I'm sure that I need to open up the Ws and either clean the tweeter level pots, or better, bypass them. Later EPIs didn't have the unecessary control, and are better for it. The speakers sound best flat and besides, that kind of adjustment is best left to tone controls.
The bottom line, is that the EPI 100 is a fantastic speaker, and a huge bargain. Don't underestimate it's musicality. It's always a pleasure to listen to.