Acoustic APDI User Manual - Page 5

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10. 3 Band EQ with Variable Mid-Range Frequency Band:

Low: This control increases or decreases bass frequencies by +/- 12 dB.

Mid: This control increases or decreases the chosen mid-range frequency

by +/- 12 dB.

Mid Frequency: This control allows selection of the mid-range frequency

from 500Hz to 1.2 kHz.

High: This control increases or decreases treble frequencies by +/- 12 dB.

Note: At 'noon' setting on the knob there is no increase or decrease

applied to the specific frequency band.

11. Master Volume Control: Adjusts the overall volume level of the effected signal

output by the APDI.

12. Pre/Post EQ: Button switches the Output via XLR or ¼" Line Out between pre

and post EQ operation.

13. Feedback Elimination Circuit:

This circuit allows you to select and eliminate specific frequencies that are

causing feedback to occur. Engage this circuit by pressing down the Feedback

Eliminator button.

Level Control Knob adjusts the amount of feedback filtering. Be sure to

set this control to "off" if you are not experiencing any feedback issues.

Frequency Control Knob adjusts the frequency of the feedback filtering.

To control Feedback, do the following:

1. Set the Level control to "12 o'clock" setting or higher.

2. Turn the Frequency knob, moving from left-to-right, to search for the

frequency at which the feedback is to be suppressed. You should

hear the feedback noise lessen as you find the correct frequency.

A. If the feedback sound is primarily in the lower bass notes it's likely

occurring in the lower frequency range, start at the left or 'zero'

position of the Level knob.

B. Sweep to the right if the feedback sounds higher pitched indicating

it's likely in the higher frequency range.

C. When the feedback is eliminated, reduce the Level control until the

feedback returns, then adjust slightly back upward until it is gone.

14. Bypass Footswitch: Disengages the preamp circuit (Gain control, EQ,

Feedback Elimination and Volume controls are disengaged) leaving the signal

unaffected. This functionally turns the APDI into a regular DI with no tone

shaping applied. Note that the FX Loop will still function.

15. Mute Footswitch: Quickly mutes the audio output of the APDI at both XLR

and Line Out connections.