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Operating the D3500
Adding Dynamic Filters
• If you have not set the RESONANCE filters to remove
feedback problems that occur due to microphone and
monitor placement, as well as room acoustics it is a good
idea to do so by following the previous section, "Using the
LEARN Mode", to set filters 1 - 10.
• Next, select the filters number 11 – 15 by pressing and
holding the channel 11 Filter Select Switch, and then
press the channel 15 Filter Select Switch. At this point
you will notice that the green Selection LED for the fil-
ters 11 – 15 are lit. This indicates that the filters are ready
to be set-up and engaged.
To set these filters to DYNAMIC mode, press the EQ
switch until MODE is displayed in the main LCD.
• Use the Data Wheel to select Mode 2; (DYNAMIC).
• Now you can see how the filters work by taking a micro-
phone and performing a walk test around the stage.
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When you step in front of a monitor, and it feeds back,
you will see the ACTIVE LED of one of the Filters set to
DYNAMIC light, indicating that filter is setting itself. As
you continue to walk and get more feedback the other
filters will set themselves.
• Note: You can clear out any filter (or number of filters)
and have it start search for the feedback frequency
again by pressing the Filter Select switch and the press-
ing the RESET switch.
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Using the Processing Switches
In addition to being a great sounding, clinically precise,
digital equalizer, the D3500 provides a host of useful digi-
tal effects, which have been designed to make an audio
engineer's job easier and project sound better. The MODE
switch lets you set the operating parameter for the auto-
matic feedback filters. The EQ switch assigns the selected
digital eq filter to the LCD screen so you can view a numer-
ic measurement of the Frequency, Bandwidth and Gain.
The GATE effect allows you to eliminate annoying buzzes
and hums. The DELAY effect is perfect for phase aligning
speakers systems using multi-transducers and for delay-
ing speaker arrays in large venue installations. The D3500's
unique ENHANCER effect will help reduce the overall sys-
tem noise, while at the same time, sweeten-up the high
end of any speaker. To set the over all low or high-end
frequency contour, the D3500 features multi-pole, Hi-pass
and Low-pass filters. Speaker protection is handled with
the D3500's digital LIMITER.
The navigation buttons located in the center of the unit
under Filter Select buttons, along with the Data Wheel,
control the various parameters used to set-up these pow-
erful effects. Remember, some of the effects may have
several pages, which are accessed by pressing through the
effects switches.
Using the Feed Back Mode
You can adjust the parameters of the automatic feedback
filters in order to optimize the performance for your spe-
cific application by using the D3500's Feedback Mode set-
up. The D3500 let's you adjust the Sensitivity, Release time
and Hold time for the automatic filters. Follow these steps
to adjust the Feedback Mode.
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