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Hi Yosuke

In a digital mic split system 1 system has to be the clock master and the other system will have to be a slave system that recieves its audio clock from the master.

I am assuming you are using ACE to connect each mixrack via PORT B?

you set the audio clock source in the mixrack setup – mixer preferences audio – sync page.
set the system you want to be the Audio clock master to: Internal
Set the system you wish to be the slave as: Port B

if you cannot see port B available in the drop down menu this means that nothing is fitted to the Port B Slot or there is a fault with the Port B Module. In this case please contact A&H Technical support who will help you resolve your issue.

Hope this helps
Sam A&H