Audio Connections
Page 27
Peavey Electronics Corporation
Audio Connections
Each audio connection on the MM
™
-8802 is a single three-wire, balanced analog circuit. The MM-8802 is supplied with a
three-screw removable Euro block that plugs into a mating connector header on the MM-8802 for each audio channel. The pre-
ferred method for making audio connections consists of four steps as shown in the illustration. The audio connections are iden-
tical, except one is an input, the other an output. As with any electronic connection, care should be taken to ensure that the
termination is solid. There should be no stray wire strands, kinks or nicks in the wire jacket for a proper termination. And as
always, audio connections should be made with high quality stranded, shielded wire.
Fig. 6, Analog Audio Connections
Euro connector headers
Removable Euro Connector Block
terminated to standard shielded
audio wire.
STEP 1.
Carefully strip the
cable jacket and the conduc-
tor insulation so that your
wire looks something like
this. The distance between
the end of the jacket and the
tips of the conductors should
be approximately .0750”. The
strip length of the conductor
wire should be .310” for prop-
er termination into the Euro
connector.
STEP 4.
Take the completed wire/connector assembly and carefully plug it into the matching connector header on the MM-
8802’s rear panel. Take care that you are plugging the connector into the proper set of pins on the header. There is no barrier
between adjacent audio channels, so it is possible to connect to pins of an adjacent channel. If you are not careful, instead of
connecting to Positive, Negative and Shield, you may end up connecting Negative, Shield & Positive or Shield, Positive &
Negative! Your finished connection should look like this.....
STEP 2.
Carefully insert
each conductor into the
opening of the Euro connec-
tor. Take care to ensure that
polarity is observed and that
the shield is properly twisted
to make a solid connection.
Ideally, the shield should be
isolated by installing heat
shrink insulation. The cor-
rect termination for all audio
connections on the MM-
8802 is Positive (+), Negative
(-) and Shield (SH) as shown
on the rear panel label.
NOTE:
When terminating single-ended (unbalanced) input cir-
cuits to the MM-8802, the negative side of the signal should be
bridged to the shield (SH) conductor. However, for output cir-
cuits it is not necessary to tie one side of the signal, normally neg-
ative, to ground. Please remember that when using an unbal-
anced output, the signal magnitude is 1/2 of a balanced output.
This is significantly different than the legacy BoB models. The
older units required that both output legs be terminated, even in
unbalanced applications. This is because the MM-8802 uses a
push-pull output configuration, while the older units were
designed with a cross-coupled output topology.
STEP 3.
While holding the
cable so each conductor is
firmly seated in the connec-
tor, carefully tighten down
each screw of the connector.
While turning each screw,
look closely at the wire and
make sure that the action of
the screw does not “push”
the wire out of the connec-
tor. Verify the integrity of
your connection by gently
pulling on each conductor to
ensure that it is terminated
properly.
