I am the original owner of a pair of SDA 1's purchased in 1983. I would like to breathe some new life into these great old speakers. I have contacted Polk Service and they sent me schematic; however, it does not match the crossover in my speakers. My Polk SDA 1's are designated "Signature Edition". Each speaker has a gold colored metal plaquard placed centered below each pair of tweeters. Polk Service said they would look to see if they had information on the SDA 1 "Signature Edition". However, that was some time ago. Does anyone have the schematic for the "Signature Edition" SDA 1?