I am looking at building a pair of SDAs. I know that it has been done before, but can't seem to find any of the posts. Using the schematics that were posted earlier, I have been mulling over my options. I am not sure which model I might build, but the cross-overs seem pretty easy to build. Even though the schematics have the components, does any one know the exact specs on the capacitors or resistors, or some where that all the parts can be commondered?