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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 131 is mounted in a rack cabinet, or through AC ground when the E 131 is
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.
Main AC Ground
Rack cabinet
When a Y cord is used, shorten the wiring to minimize noise.
Ground lift switches are provided on the rear of the E 131. Sliding the ground lift switch from a
NORM position to the LIFT position lifts ground.
On the road use
The E 131 is sturdily constructed with an aluminum die-cast front panel that is reinforced by means
of an iron plate attached to its back. To ensure that strength is maintained during its transportation
from one place to another, however, you should also reinforce the unit from the back of the rack with
a special support bracket. This can be accomplished by removing cord-hangers on the rear panel, and
screws that hold the rear panel to chasis, and fitting the special support brackets through the holes.
Top view
Special support bracket
Side view
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Installation Precautions