Hi
Just three thoughts - although I am by no means an expert at this:
1. Be very careful with the pins on the XLR. It is very easy to get confused. Be sure what side you are viewing from - solder side(rear view in image below) or pin side! Also be sure what sex you are looking at! Hopefully the transformer has numbers on it so that you can follow it through your connector.
![[Linked Image]](https://www.meridianunplugged.com/ubbthreads/gallery/16/full/3902.jpg)
2. It will probably work without the AES ground connection as at the AES end, the ground is just for shielding. (In case you want to try it to eliminate something?)
![[Linked Image]](https://www.meridianunplugged.com/ubbthreads/gallery/16/full/3903.jpg)
(Note that the above diagram is not from your make of transformer)
3. Pin 7 (AES+) in the speaker may have phantom DC power (with ground). Connecting AES + and AES - to the transformer (AES 110/SPDIF 75 converter) should not be an issue but if you have somehow connected AES+ to ground that may be an issue!
Regards
Peter