Radio Shack 04A00 - Manual (Page 6)

6 Connections
amplifier. Then, make sure STEREO/MONO
on the back of the amplifier is set to MONO .
GROUNDING THE INPUT
SOURCE
To avoid a low frequency hum, connect your
audio mixer’s or preamplifier’s ground wire
(usually black or green) to the
GND terminal
on the back of the amplifier.
CONNECTING SPEAKERS
You can connect one or more 4-, 8-, or 16-
ohm speakers to the amplifier. You can also
bridge the amplifier’s channels.
The amplifier has two channels: A and B . If
you connect two pairs of speakers, follow
these guidelines:
• Speakers connected to the same chan-
nel ( A or B ) are part of a pair and must
be of the same impedance.
• Speakers connected to different chan-
nels ( A or B ) are not part of a pair and
can be different impedances.
Most speaker terminals are color-coded or
have a mark that indicates the terminal’s po-
larity. Usually, terminals with positive polarity
are red or have a plus symbol (+), and termi-
nals with negative polarity are black or have
a minus symbol (–). Phasing is correct when
you connect + to + and – to –.
Preparing the Speaker Wires
Use the shortest length of wire possible to
connect the speakers. After placing the
speakers, use this table to determine the
wire length and choose the appropriate
gauge.
To prepare the speaker wire, remove about 1
inch of insulation from the end of the speaker
wire you are connecting to the amplifier.
Then twist the exposed wire to secure all of
the wire strands.
Unbridged Connection
Use this connection if you are connecting
more than one speaker on the same channel
or if you do not have high-power speakers.
1. Connect the speaker
wires to the corre-
sponding left and right
speaker’s positive (+)
and negative (–) ter-
minals.
2. Connect the other end of the left and
right speaker’s positive (+) and negative
(–) wires to the amplifier’s correspond-
ing
SPEAKERS LEFT and SPEAKERS
Wire Length Wire Gauge
25 feet or less 18 gauge
Over 25 feet 16 gauge
Wire Strands
Split strands
about 4”
1"