User Manual
18
Pro Tools Connection
Confirm that Red 16Line’s Host setting is set to ‘Pro Tools’, see Global Host Settings on page 20. 
Connect both rear panel PRIMARY ports to a Pro Tools | HDX card using Mini DigiLink cables.
Each Pro Tools | HDX PCI/PCIe card provides two Mini DigiLink ports (giving the card a capacity of 64 
inputs and 64 outputs), thus one Red 16Line may be connected to each card. 
A Red 16Line will appear as four devices in Pro Tools: 
A: 1-16 (Port 1)
B: 1-16 (Port 1)
C: 1-16 (Port 2)
D: 1-16 (Port 2)
A  maximum  of  3*  Red  16Line  units  can  be  connected, 
giving a total I/O capability of 174 inputs and 192 outputs.   
* Or one Red 16Line if using an HD Native system.
Note that both Red 16Line ports are Primary connectors; this means that an additional Pro Tools interface cannot 
be added in series – Red 16Line does not operate in Expansion mode.
Using Red 16Line with other Pro Tools | HD 
interfaces
Pro Tools | HD I/O audio interfaces may be used on the same 
Pro Tools system as Red 16Line. Pro Tools interface units can 
be added by using additional Pro Tools | HDX PCIe interface 
cards.
Connection to a Pro Tools | HD system would require the use of DigiLink 
-to- Mini DigiLink adapter cables.
Loop Sync
It  is  important  when  using  additional  I/O  devices  that  the 
Loop Sync connection is complete between all units:
• Using  75Ω  BNC cables, connect each  LOOP SYNC OUT 
connector to the LOOP SYNC IN  connector on the next 
I/O unit
• Complete the  chain  by connecting LOOP  SYNC OUT  on 
the final I/O unit back to LOOP SYNC IN on the first unit
Mini DigiLink Cables










