Q: How can we do the aesebu connections between several PLM20k44?
A: The old PLM had a AES link connector. It was however passive, not electronically buffered. In the PLM+ we were forced to omit the AES link to fit the extra inputs.
So in essence you can make the same linking as in PLM but you need to fabricate cabling were you do passive link daisy-chaining. Either the link cable coming out of the same XLR housing or do it in a patch panel.
The other alternative would be active AES splitters but should not be necessary just because going from PLM to PLM+. We do not have any official product recommendations for AES splitters.