I received a couple of AR6 few days ago. Unfortunately missing both woofers. I sold a lot of theese AR6 in 1975/77, so I know hey were 8 ohms. The problem is on the bac of the box the paper says 8 ohm, but bot the tweeters are 4 ohm ! The crossover is the model you indicates as "B", and tweeters are original, old, but still working very well. Anybody can tell me how it is possible ? Thanks a lot.