Wiring Diagram Using An Ssp; Noise In A/V Systems - Mark Levinson N380S Owner's Manual

wiring diagram using an SSP

noise in a/v systems

video 1 video 2 video 3
Surround Sound Processor
LF RF
display
intensity
inverted
mode
polarity
monitor record select balance
mon 1 2 3 4 5 6 mute
o
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 -75
transformer, you can easily construct one from the adaptors which probably came
with your VCR and television, as shown below.
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.
LS
video 4
RS
Surround Power Amplifier
Ctr
Center/Sub Power Amplifier
Sub
RF
R
MADRIGAL AUDIO LABORATORIES
Main (Front) Power Amplifier
PREAMPLIFIER Nº 380S LF
standby
Listening Room
Ground Isolation Adaptor
75 300
300 75
LS
RS
Ctr
Sub
RF
LF
balans (isolation)
33