No, the 411-8A woofer was a 15 inch real acoustic suspension woofer. I know quite a bit about Altec products. I used Altec "Voice of the Theater" components before switching to more home friendly speaker drivers. It had a very souple foam suspension. You could put in on a table and the cone would simply touch the table top. Bruce,my best friend who died 2 years ago, managed two specialized audio shops in Montreal. One of them sold Altec products. We discussed about that woofer a couple of times but he never mentioned that JBL had supplied it to Altec people.
To my knowledge, Altec made a few weird products in the period of their existence, one was the 3000 sectoral horn tweeter used for home audio; that tweeter tweeter was using a microphone diaphragm, one of their worst products.
Here is info on the Santiago system and more details on the 411-8A woofer used in it: