Hello everyone, new to this forum here. I recently came across Western Electric 107B speaker. I'd like to hook it up and use it with my WE 1956 500C/D phone. I really don't know anything about the 107B system and couldn't find much anything while researching online. The speaker was made in Oct of 77, and the connection wire coming out of it has 6 connections. Any info about the system or how to connect it would be greatly appreciated. Thanks!