Vizio E 131 Installation Precautions, Ground Loops, On the road use, Main AC Ground Rack cabinet

Installation Precautions

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

aspecial 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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