I got a great deal on a pair of black ash series II models in very good condition. Picked up unheard the owner thought it needed a replacement woofer as well as refoam the other but after removal and testing I'm convinced the new surrounds is all that's needed for both. Original style foam or rubber? The polydomes sound good and covers are pliable. Tweeters good. Should I ohm all the drivers? Any insulation, bracing, or crossover suggestions? Also picked up some CS 3008 need refoam all six drivers. I can't wait to A/B test them side by side since they are so similar in vintage.