Manual Roland AC-40 (page 9 of 76) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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Operation

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Using the Anti-Feedback Function

What is acoustic feedback?

This is an unpleasant oscillation (a whine, buzz, or howl) that occurs

when the output from a speaker is re-input to a microphone or

pickup, amplied, and output again from the speaker.

This is more likely to occur when you point the microphone at a

speaker or raise the volume to a high level.

Sound continues

cycling, causing

feedback

What is the anti-feedback function?

This function suppresses the acoustic feedback that can occur

between a guitar or microphone and the amp. It does this by

attenuating the sound in the frequency range at which feedback is

occurring.

Feedback will be suppressed automatically when you use the anti-

feedback function.

1. Turn the [ANTI-FEEDBACK] switch “ON.”

When you turn the switch “ON,” the feedback point (frequency) will

be detected automatically.

The anti-feedback function will be applied to the microphone or

guitar connected to the GUITAR CHANNEL and MIC/LINE CHANNEL

inputs.

MEMO

In order to prevent feedback from occurring during your

performance, we recommend that you turn the anti-feedback

function ON before you begin performing.

NOTE

* The next time you turn on the power, the setting for the

feedback point that was automatically detected will be reset.

* If the anti-feedback function is not enough to suppress

feedback, take the following steps.

• Change the direction of the guitar or microphone

• Move the guitar or microphone away from the speakers

• Lower the volume

Using the Arm Stand

When using the AC-40 at a low position such as on the oor,

extending the arm stand will make the sound from the speakers

easier to hear.

Arm stand

NOTE

* When using the arm stand, please observe the following points.

• You must place the AC-40 on a horizontal surface.

• Do not place objects on the AC-40, or sit or stand on the

AC-40.

• Do not lift or carry the AC-40 by grasping its arm stand.

* Fold the arm stand if you’re not using it.

* When deploying or retracting the arm stand, be careful so as not

to get your ngers pinched between the movable part and the

unit itself. In places where small children are present, make sure

that an adult provides supervision and guidance.

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Roland AC-40 Manual

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