11
FEEDBACK DESTROYER PRO DSP1124P
s
A filter has been set, i.e. it is already suppressing feedback; or:
s
A filter is set to
Parametric EQ
mode (gain
¹
0 dB).
Cyclically flashing LEDs signal that a filter is searching feedback frequencies in
Single-Shot
or
Auto
mode (see chapters 5 and 6.3). Inactive filters (OF) and filters in
Parametric EQ
mode (see 6.2), with
a gain setting of 0 dB, are indicated by unlit LEDs.
3
The
LED DISPLAY
consists of a clearly visible, two-digit numeric display. After power-up, it reads the
number of the last preset used. Additionally, the LED-DISPLAY shows the absolute values of the
parameters that are being edited.
4
The
INDICATORS
to the right of the DISPLAY (
Hz, kHz, 1/60
and
dB
) light up when you edit the
associated parameters in Edit mode. For example, when you raise the level of a filter, the dB indicator
lights up.
Fig. 4.2: Function keys and JOG WHEEL
5
With the
JOG WHEEL
, a continuous rotary control, you can freely edit the selected parameters. Turn
the wheel clockwise to increase the values, or counterclockwise to reduce them.
6
With the
FILTER SELECT
key activated, you can use the JOG WHEEL to select one of the 12 filters
per channel. Subsequently, you can edit the filters.
7
The
FILTER MODE
key gives you access to the four operating modes for the individual filters:
Off
mode
(OF),
Parametric EQ
(PA),
Single-Shot
mode (SI) and
Auto
mode (AU). Please read chapter 6
OPERATING MODES OF THE DSP1124P.
+
Pressing the FILTER MODE and GAIN keys simultaneously allows you to adjust the sensitivity
of the feedback suppression trigger circuit. The setting range is from -3 through -9 dB and can
be adjusted with the JOG WHEEL. The default value is -6 dB, as this setting usually delivers the
best results.
8
Use the
ENGINE L
key to select the left audio channel.
9
Use the
ENGINE R
key to select the right audio channel. If you wish to process both channels at the
same time (
Couple
mode), press both ENGINE keys together. In Couple mode both ENGINE LEDs light
up. Whenever you edit one of the two audio channels and then switch to Couple mode, the parameters
of the active channel will be copied to the other, i.e. if you press ENGINE L before ENGINE R, left will be
copied to right.
Items
through
refer to
Parametric EQ
mode only (see chapters 5 and 7.3).
10
Press the
FREQUENCY
key to select the frequency you wish to process. The adjustable frequency
range is from 20 Hz through 20 kHz, which are split up by the DSP1124P into the 31 standard ISO
values of a graphic equalizer (see chapter 11.1 in the appendix).
11
The
FINE
key allows you to fine tune the standard ISO frequencies (in 1/60-octave steps), within a
tuning range of 1/3 octave (-9/60 to +10/60).
12
BANDWIDTH
determines the filter bandwidth (Q factor) of the selected filter. This adjustable filter quality
ranges from 1/60 octave to 2 octaves (120/60 octave).
4. CONTROL ELEMENTS
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