Operation Manual

11
Operating the D3500
Using the LEARN Mode
The following example is for reducing feedback in a typical
PA system used by a band in a small to medium size club
using the LEARN feature. You will set ten of the filters to
RESONANCE mode to remove problem frequencies that
have to do with microphone and monitor placement, as
well as room acoustics. Later on in this section, you will
find an example that explains how to set some additional
filters to DYNAMIC mode to handle feedback problems
that occur from artists moving around on stage with their
microphones. To get started with the LEARN function fol-
low these simple steps:
• Press the LINK switch so that the green LED lights,
indicating the left and right channels are linked
together.
• Press the BYPASS switch so that the LED is off, indicat-
ing the D3500’s digital effects are engaged.
•
To recall a default preset, p
• To recall a default preset, p•
ress the LOAD switch. The
LED will flash indicating the D3500 is ready to load a
preset.
• Use the Data Wheel to select Preset 00.
• Press the LOAD switch again. The LED will stop flash-
ing indicating the preset has been loaded.
• Now, select the first ten filters by pressing and hold-
ing the Channel 1 Filter Select Switch, and then press
the Channel 10 Filter Select Switch. At this point you
will notice that the green Selection LED for the filters
1 – 10 are lit. This indicates that the filters are ready to
be set-up and engaged.
• To set these filters to RESONANCE mode press the EQ
switch until MODE is displayed in the main LCD.
• Use the Data Wheel to select Mode 3; (RESONANCE).
• Next, adjust your microphones to the maximum vol-
ume, just before feedback. It's actually a good idea to
let a little bit of feedback ring out, and then turn the
level down just below the feedback.
• Now press the LEARN switch.
• Next,
turn the data wheel to select "Start : yes", press
start and watch and listen to the D3500 ring out the
monitors.
The red LED in the LEARN switch will flash indicating that
the D3500 is scanning the frequency range and adjust-
ing the filters automatically to reduce feedback, allowing
you to maximize the overall system level.
You can see the
filters being set one-by-one by looking at each Filter's
mode LED. As a filter sets itself, the ACTIVE LED will light
up. You can also watch the LED’s around the FREQUENCY,
BANDWIDTH and GAIN control knobs change as the filter
is setting. Once the D3500 completes the filter scan, the
red LEARN LED will stop flashing, letting you know that
the LEARN function is completed. In some situations, all
the filters may not set. This is okay, since the D3500 will
only use what it needs to get the job done, and is always
intelligently managing the internal DSP resources in order
to maximize system performance.
Now, you can add some DYNAMIC filter to handle the prob-
lems caused by artists moving around the stage with active
microphones. Follow the next section to set the Dynamic
filters.
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D3500_ownman_v1_2.indd 11 9/4/05 5:20:08 PM