digital connection BMC2 to KH750


I’m looking for the best solution to digitally connect my KH750 Neumann subwoofer to my Tc BMC2 converter.
The KH750 has a AES3 BNC input
The BMC2 has a AES3-id/ 75ohms SPDIF RCA Output

As the KH750 has digital processing inside, I’d like to avoid any extra digital<->analog conversion between the converter and the speakers.

Unfortunately, I’m not aware enough about digital links and this require very precise knowledge.

Level, impedance, cables, converters, adapters, RCA, XLR, BNC, so many options.

Some infos here : KH750 : browse operating manual here

Thanks for your help