PRESONUS NSB Series Owner's Manual page 23

Repeat Steps 2-5 with Inputs 17-24 and StudioLive 24R Sends 17-24.
Your StudioLive 32SX is now configured as follows:
Channels 1-8: No network source available.
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Channels 9-16: Network sourced from StudioLive 24R Inputs 9-16.
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Channels 17-24: Network sourced from StudioLive 24R Inputs 17-24.
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Channels 25-32: Network sourced from NSB 8.8 Inputs 1-8.
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2.3 Using an NSB-series Stage Box with Two or More Mixers
From the Available Stream list, use the Value
encoder to scroll to NSB 8.8 Send 1-8.
In our example, we will also be using routing
inputs 9-24 on the StudioLive 24R as part of our
mix on the StudioLive 32SX. Let's go ahead and
route those now.
Select Input 9-16.
From the Available Streams list, use the Value
encoder to scroll to StudoLive 24R: Send 9-16.
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