Galaxy Audio Core PA8X140 Manual del usuario - Página 7

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SOUND

REINFORCEMENT

Feedback (the shriek sometimes emitted by sound systems) occurs when the microphone (or pickup) and speaker are posi-

tioned too close together for a given level of volume. Once feedback occurs, it will continue until either the volume is de-

creased or the microphone or speaker is moved. Gain is the degree to which the volume may be turned up before feed-

back begins. In setting up a sound system, the object is to maximize the gain.

In most cases, the (main) speakers should be placed on stands, at a height slightly above the heads of the

audience, in front and to each side of the stage.

They should be rotated inward, but only slightly. More than a few degrees of rotation can reduce the gain.

Powering monitor speakers with the same channel of the amplifier used to power main speakers may cause

feedback.

Ideally, monitor speakers should either have their own volume controls or be routed through a separate channel of the

amplifier so the volume of one speaker system can be adjusted without affecting the other.

Most mixers provide separate controls for the mains and monitors. Separate monitor outputs make it possible to tailor

the monitor mix and the levels, independent of the mains.

The PA8X140's tone controls provide one means of controlling feedback. Begin with the MID and HIGH controls

set at 12 o'clock, and LOW at 10 o'clock. Gradually increase the volume until it reaches the point immediately before

feedback (the speaker should ring slightly). Turn the MID control to 10 o'clock. If the ringing stops, leave the MID

control in that position. If the ringing persists, return the MID control to 12 o'clock. Turn the HIGH control to 10

o'clock. If the ringing stops, leave the HIGH control in that position. If it persists, return the HIGH control to 12 o'clock

and repeat the process, turning the MID and HIGH controls to 9 o'clock and the LOW control to 7 o'clock. Periodically

talk through the system, while repeating this process, until several notes ringing at once or sound quality is noticeably

reduced.

In high volume applications, reduce all the LOW frequencies. Low frequencies are omnidirectional and can be heard

equally well anywhere on stage. They are not needed in the monitor mix.

The CORE PA8X140 automatically provides a flat frequency response whenever the tone controls are set to their

center-detent positions.

Use a unidirectional microphone. Since there are many brands, with wide variance in their amounts of rejection (the

ability to not pick up peripheral sounds), experimentation provides the best means of choosing the right microphone.

The CORE PA8X140 should be positioned as near to the performer as is practical. The closer it is, the louder it is.

The CORE PA8X140 should be placed to the rear of the microphone being used by the performer.

If, in a system with multiple monitors, one monitor is substantially nearer a vocal microphone than are the other

monitors in the system, its volume may need to be reduced to avoid limiting the gain of the entire monitor system.

BASICS