Specifications

7
DIP Switch/Hardware Options - Definitions
High Q Filters vs. Low Q Filters
The DFR11EQ offers two selections for the shape of the
1
/
10
-octave notch filters: the High Q filter
(default) and the Low Q filter. A High Q filter’s width stays very narrow as the filter depth is increased.
This attenuates the minimum amount of signal possible to ensure system stability, while maintaining
excellent sound quality. This setting is appropriate for most applications.
The Low Q filter setting maintains the filter’s shape as it is deepened, so the width of the filter
effectively widens as the depth increases. Using this setting attenuates the signal more, producing a
greater system stability than the High Q setting, but with slightly diminished sound quality. This
setting is appropriate for systems such as a speech-only PA where stability is an absolute must, but
the sound quality can be compromised a bit.
The DFR11EQ High Q/Low Q setting may be switched at either DIP switch number 5 (see DIP
Switch section) or in the software’s Hardware Options window (see Hardware Options section).
HIGH Q
LOW Q
Front Panel Locking
The front panel of the DFR11EQ can be locked at either DIP Switch 6 (see DIP switch section) or
through the software’s Hardware Options window (see Hardware Options section). This prevents
tampering after the audio signal has been processed to meet the room’s requirements. In the
Hardware Options window, there is also an option to lock only the DFR controls. This allows users to
switch between scenes while maintaining protection of the filters within the scenes.
Hold/Update
The Hold/Update option is accessible using either DIP switch 6 (see DIP switch section) or the
Hardware Options window (see Hardware Options section). They operate in the following ways:
UPDATE position: When the HOLD/UPDATE DIP switch is in the UPDATE position (default), or
the UPDATE option is selected in the Hardware Options window, the DFR11EQ saves the feedback
filters every time the unit is powered off. When the DFR11EQ is powered on again, the feedback
filters will be at exactly the same settings as when the unit was powered down.
HOLD position: When the HOLD/UPDATE DIP switch is in the HOLD position, or the HOLD
option is selected in the Hardware Options window, the DFR11EQ immediately saves the feedback
filters at the current settings. When the DFR11EQ is powered off, any changes made to the feedback
filters after the switch was set will be forgotten. When powered on again, the feedback filter settings
will be exactly the same as when the HOLD/UPDATE DIP switch was changed to the HOLD position.
This feature is useful for storing the best filter settings for a sound system.
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