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SDA 1 refurbish question: I'm planning on upgrading the XOs and such. And I have seen what these speakers need for an electronic components replacement (caps, etc.) thanks to many of you who have spec'd this out and others who have done it and logged the effort for the rest of us. What I am not clear about is should I first be taking steps to upgrade from the SDA 1 - to - SDA 1C and then do the XOs or what?