In looking at the specs on the Classic 1/2 I do see that it is designed as a traditional 3-way vs. the 1/2e which is a 2.5 way essentially. Robert E. Greene does have a lot of great information on some of the earlier Spendor designs including the 1/2. One of the things he mentions is the main driver went from about 40 Hz to 3000 Hz (which I believe had it's origins in the Spencer Hughes designed BC-1), carrying most of the key frequencies with it which in his opinion gave it great coherence and transparency. From 3000 Hz to 13,000 Hz Spendor the signal was carried by a 1.5" tweeter, and above 13,000 Hz a 3/4" tweeter.
Here is a link to the Robert E. Greene article:
http://www.regonaudio.com/SpendorSP12Loudspeakers.html
Here is a link to the Robert E. Greene article:
http://www.regonaudio.com/SpendorSP12Loudspeakers.html