I am seeking some opinions and advice from more knowledgeable minds regarding the differences between several similar 8" woofers from AR speaker models from the late 70's and early 80's. In particular, the part numbers are: 200035, 200036 and 20037. As I understand it, 200035 was the woofer in the AR-93 speaker; 20036 was the lower midrange for the same speaker; and 20037 was the woofer in the AR-18 and several others. These three drivers appear nearly identical, yet they obviously were intende