I was wrong in my first reply to this. The cone does move. It is a 12 in , firing straight down into a 4.3 cf sealed cabinet filled with batting, covered with cloth to keep it from going all over when you remove the driver.
The speaker , of course , has no crossover. The top section that radiates HF is titanium (even more expensive in 1977) , then lower on the cone is stainless for MF and then lower is paper for LF. I was kinda freaked, looking at horizontal depressions all around the paper. OHM's president assured me that they come from the factory that way and these were position calculated for dampening.
Have been doing fuse testing last 2 days and now they seem very stable on 3A. (they shipped with 4A)