Drew928AKG uses the cursed 3 pin mini xlr connector. Why they don't use the 4 pin option is damned irritating to me. As a result the return for both channels is shorted meaning no "balanced" capability without modding.
The mod should be easy since an xlr connector is already there. You'd just have to change it to a 4 pin one if you can find one that fits. That means you're getting into custom cable territory as well though.