wiring diagram using an SSP

noise in a/v systems

video 1

 

video 2

video 3

video 4

LS

 

LS

 

RS

 

 

 

 

 

 

 

 

 

 

Surround Power Amplifier

RS

 

 

 

 

 

 

 

 

 

 

 

 

 

Surround Sound Processor

Ctr

 

Ctr

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LF

RF

 

Sub

Center/Sub Power Amplifier

Sub

 

 

 

 

 

 

 

 

 

 

display

 

 

 

 

 

 

 

 

RF

 

RF

intensity

 

 

 

 

 

 

inverted

 

 

 

 

 

 

 

 

mode

polarity

 

 

 

 

 

 

 

 

 

 

 

 

 

Main (Front) Power Amplifier

 

 

 

 

 

 

 

 

 

PREAMPLIFIER Nº 380S

LF

LF

 

monitor

 

record select

 

 

balance

 

 

mon

1

2

3

4

5

6

mute

standby

o

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Listening Room

 

In some cases, connecting your audio and video systems together can result in noise, typically a 50/60 Hz or 100/120 Hz hum. The most common cause for this noise is a “ground loop” caused by the presence of two ground references in the system: one from the power company and another from the cable-television com- pany. The simplest way of solving this problem is to break the cable company’s ground by using an isolation transformer on the incoming cable line, before it reaches your television or VCR. If you cannot find a 75-75balans (isolation) transformer, you can easily construct one from the adaptors which probably came with your VCR and television, as shown below.

Ground Isolation Adaptor

75300

30075

place in-line with your cable feed, prior to the system connection

The assembly shown above may cause some loss of video signal strength and/or bandwidth, and should be used as a temporary fix. It is useful in determining the cause of some video-related noise problems, however, and costs only a few dol- lars. If it seems to correct a problem, consult with your dealer regarding a long- term solution which does not degrade video performance.

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Madrigal Imaging N380S owner manual Ground Isolation Adaptor