Bogen GA6A Phasing, Microphone Input, Auxiliary Input, Power and Grounding, Connections

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 120V 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.

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