yes, there was an 'A' series, gray cone, then there was a 'C' series, that had the red S in the middle, and it had a dustcap inverted. Then the last round was the 'D' series, full cup cone and no dustcap. Then, 2000, then went to the L7.
I agree, the round ones were awesome, worked great small sealed (.33,.66.88) respectfully, but they were lower power handling, and SVC.

 

Make custom couch with them inside for your home theater.

 

Infinite Baffle in the attic with the front open to a home theater/TV room would be nice.