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Reconization & situation. In solely speech transmission, you may lower the feedback sensitivity to -9dB.
This will compress feedback speedily. On the other hand, increase in feedback sensitivity (e.g. -3dB) will be
More stabilize, but will be slower in detecting the feedback signal.
SINGLE mode in filtering process will analyze music signal automatically in order to detect feedback
frequencies. Once detected the feedback frequencies, filter will set its parameters to compress feedback
automatically. As filter is lock on detected feedback frequencies, thus these types of mode are very suitable
for compressing feedback with constant frequency. Effective application such as fixed located microphone
(e.g. inside a permanent installed conference room system). Although Filter will adjust automatically and
enter to a lock mode to fix the frequencies, but the octave band and depth of filter are still effective for
feedback frequencies. Once feedback frequencies move, there will be an increase in octave band range
resulting feedback in preference and decrease in gain till feedback repeated.
All moveable microphones are advice to work with AUTO mode for feedback control as they always have
changeable feedback frequencies. Under AUTO mode operation, filter will follow & compress feedback
frequencies even frequencies moved about. Filter will set its parameter as narrow band as possible and not
to affect musical signal.
3.4 Sequence Select
In order to store and save your favorable preset, DS212 consist of 10 USER program preset sequence and
shortcut preset sequence. All operated parameters are able to store in shortcut sequence manual for user to
select desire program. All data is good for 20 years and above storage memory. In shortcut preset (display
"0". It acts as user's basic sequence, NOT user's memory channel), all filter maintain at its parameter mode,
octave band will set at 1 time frequency range, frequency as 500Hz and 0dB gain.
3.4.1 Adjusting Sequence
After power is on, DS212 will display previously used preset value. Turning jog wheel to select your
desire preset value.
3.4.2 Program Sequence Select
Fig. 3.1 Displays all Filter mode program.
To alter filter mode: First, press FIL SEL (filter select) button and select filter from 1~12 by jog wheel. Use
CH (channel select) button not only to select left
Then press FILTER MODE (filter mode) button and turn rotary jog wheel to select filter mode.
If "LOCK" displays to indicate there is a filter from SINGLE mode already in processing with feedback situation.
You are not able to release this filtration by going back to SINGLE mode. Once discover new feedback point,
DS212 will immediately shirt the previous filter frequency to a new one. If you escape from AUTO & SINGLE
mode and entering parameter mode, filter will remain all parameters that have been set.
3.4.3 Adjusting Filter parameter
In order to adjust Filter setting, it must be set inside parametric EQ mode. Press jog wheel to select FREQ
(frequency) menu, turn jog wheel to select desire ISO frequency. In FINE (fine) Manual, user is able to
fine tune selected ISO frequency (in1/60-octave steps) within 1/3 octave band to display mathematics ratio
between value & confirmed frequency, and detect desire frequency speedily. At this moment, user may
adjust filter octave band from 2 times frequency range to 1/60 times frequency range by selecting BAND
Display
Operation Modes
OFF
PEQ
Parametric EQ
AUTO
SING
LOCK
Fig.3.1 DS212 Filter Operation Modes
or
right channel but also selection of both left
Disable
Automatic
Single
Lock
and
right channel.
Page 7
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