Velodyne Digital DrivePLUSSeries - Manual (Page 21)

How to Connect Two Audio System Outputs to Your Subwoofer Using Line Level
and Speaker Level Connections
Line Level & RCA Connection:
NOTE: Be sure to connect + to + and - to -. Do not leave any wire strands loose at the connection.
How to Connect if Controlling your Audio System Using a 12V Trigger Signal
or Serial (RS-232) Commands
12V Trigger Connection:
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Digital Drive PLUS User’s Manual CONNECT