Altec 413-8A update. I have been digging up info. on the 413 Altec woofer. Here is what I have found. The 413-8A 15" Altec woofer was only used in the santiago cabinets, and only in the very first run of Santiagos. Production numbers of Santiagos with the 413 are less than 100 pairs. The cone kits, and surround kits for the 413 are no longer available. Anyone needing 413 repairs have to switch out the the 413s for 411-8As in the Santiago cabinets.