6
Connections
Phasing
As the voltage on a speaker changes from plus to minus, the
speaker cone moves from pushing out to pulling in. If you reverse
the polarity, the speaker responds in the opposite manner.
If a speaker is pushing out and an adjacent speaker is pulling in,
some of the pressure caused by the speaker pushing out will be
absorbed by the speaker pulling in. These two speakers are
operating out of phase.
In a paging system, all the speakers should be in phase so that
they all push out at the same time. Out of phase speakers
operate perfectly well and will not cause any harm to a paging
system, but will tend to diminish the bass response in the area
around the out of phase speaker.
The important thing is to wire all the same polarity (+ or -)
connections together. This will ensure that the speakers in the
system all work in unison.All paging speaker connections have a
polarity indicator. It may be a color code, plus (+) and minus (-)
symbols, or a red dot.
Microphone Input
Connect a low-impedance dynamic microphone (these
microphones connect using 3 wires and do not require a power
source) to the microphone terminals as shown.
Note:
Condenser microphones will not work with the GA6A because
the GA6A does not supply phantom power, which is required for these
microphones to operate.
Use two-conductor shielded cable for a balanced input and
connect the shield to the ground terminal.
Auxiliary Input
Use a shielded RCA cable to connect to the high-impedance
AUX input.The center of the connector is hot and the outside
is ground.
Power and Grounding
The AC line cord should be plugged into a three-wire, grounded
outlet providing
1
20V AC, 60 Hz. It is important to ground the
unit. If a three-wire outlet is not available, use an adapter to con-
vert a standard two-wire outlet for use with three-wire plugs.
Connect the grounding pigtail on the adapter to the screw
securing the wall plate. If the wall plate screw is not grounded, it
will be necessary to connect a grounding wire from the GND
terminal on the rear of the amplifier to a suitable ground.
+
_
+
_
+
_
+
_
Out-of-phase speaker connection.
