I don't understand why manufacturers recycle model numbers. These are not the new LM1s that look like computer speakers, or home theatre rears. I have a pair of cast aluminum originals, made, I think in the late seventies. They weigh about 15 pounds each,and have a 5 inch woven kevlar woofer. The basket of the woofer is the same casting as the front baffle, meaning that effectively the woofer is the front baffle, giving the system extraordinary rigidity, which at least partially accounts for the incredibly uncoloured sound this speaker delivers.