Omega Speaker Systems OME-DB-889D - Manual (Page 18)

4.2 Non-Floating Signal Source
Some the signal source has one side connect to a local ground. The signal ground with
OME-DB-889D ground will not be same voltage level. The input should be show as:
Common mode signal input
A.GND
Common mode Signal Source
OME-DB-889D
CH0LO
CH0HI
OME-DB-889D User’s Manual 16