OK. Using the directions supplied (thanks everyone) and using the BETTER Stancor P-6012 tranformer, I have built the AI-1. I am pretty sure it is correct.
I still have the 2.3TLs hooked to the same original Yamaha receiver (not the NAD 2200). I didn't destroy my old SDA cable, I built from scratch. When I use the AI-1 cable and turn my balance all the way to the right, the SDA effect on the left is probably twice as loud with the original SDA cable compared with the AI-1.
I have an Electrical Engineering degree, so I'm not just winging it.
Using a multi meter I proved that the old SDA cable simply is a straight through connection from pin-pin (diag 1). Also, the blades are hooked to nothing electrically. However, taking the plate off the back of the speaker, I found that the blade plug goes to the negative mid/bass connector (see picture). The diagram for the Left and Right spaker binding posts and plug are also posted.
This makes perfect sense, based on the direction that say to hook up to the pin and the negative post. I've never seen a factory AI-1, but I assume it doesn't use a wire to the negative binding post. It doesn't need to, since it probably does the same thing, only through the blade (which connects to the negative post anyway).
The last picture shows how the transformer is used to isolate the two speakers from each other. This is how I have it built.
So, I guess what I am saying is that it appears that you sacrifice some SDA effect when you use an AI-1. The side by side sda vs AI-1 comparison definately shows a degradation.
Have I done something wrong??? If not, I need to find a common ground amp.