AC ground is provided to the RX-31C and all associated equipment, and this can
sometimes causes an increase in hum noise. This is because a ground loop is made
through the shields of the connection cable and the AC line as shown Fig. 1.
Fig. 1
To solve this problem, either the chassis ground of the signal line should be
disconnected at either piece of equipment, or disconnect the chassis earth
ground, so that the ground loop is eliminated. However, it is highly dangerous to
disconnect the AC ground, as microphones and other equipment connected to the
mixing console are often touched directly by hand. This may cause an electric
shock, in the case of electricity leakage, if any other connected equipment is
touched. Therefore the chassis ground line should be disconnected. Whether or
not to disconnect the chassis ground line of other equipment depends on various
conditions. Therefore, this should be checked and determined for each installa-
tion. Care must be taken that when the RX-31C is mounted in a metal cabinet, the
chassis ground line of other equipment is connected through the cabinet.
– 9 –
Avoiding Ground Loops
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