Viking Electronics E111 - Manual (Page 8)

Mixing Console (RX-7)
Power Amplifier
P 150D
Speaker System
38-SD×2
Ground Loops
In any audio system, there are numerous ways by which ground loops can be created. For
example, they may occur when the E 111/112 are mounted in a rack cabinet, or through AC
ground when the E 111/112 are connected with preamps, mixers, etc. These ground loops
may cause hum and noise if care is not taken during connection. An increase in noise from
ground loops may be minimized by breaking the ground loop. Generally, the chassis
ground of the signal line should be broken as shown below.
Rack cabinet
Main AC Ground
When a Y cord is used, shorten the wiring to minimize noise.
Ground lift switches are provided on the rear of the E 111/112. Sliding the ground lift
switch from a NORM position to the LIFT position l i f t s ground.
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E 112
Input/Output Connections
Installation Precautions