Default Presets

ENGLISH

The DFR22 comes with three factory-configured presets. Although a computer is required to configure the DFR22’s equalizers, dy- namics processors, delays, and crossover, you can use the DFR22 “out of the box” as an automatic feedback reducer, without connect- ing it to a computer.

Preset 1: Provides two independent feedback reducers. The audio signal going to Input 1 is analyzed and filtered by a feedback reducer using up to 16 notch filters, and is then routed to Output 1. Input 2 is analyzed by another feedback reducer and then routed to Output 2. On the front panel, Row A of the DFR Filters and controls is assigned to the feedback reducer on Input 1; Row B is assigned to the feedback reducer on Input 2.

Preset 2: Provides a stereo feedback reducer. Signal going into each input is analyzed independently, but the feedback reducer ap- plies the same notch filters to each channel. As with Preset 1, Row A of the DFR filters and controls on the front panel is assigned to the feedback reducer on Input 1; row B is assigned to the feedback re- ducer on Input 2. Because the feedback reducers always apply the same filters to both channels, the DFR filter indicators and controls are linked.

Preset 3: Similar to Preset 1, except both inputs are routed to both outputs.

FRONT PANEL CONTROL FUNCTIONS Auto Clear

By default, the DFR22 saves all feedback filters during a preset change or power cycle. However, you can configure the device to automatically remove dynamic feedback filters and changes to the depth of fixed feedback filters, according to parameters that you specify.

Each time the DFR22 detects a feedback frequency, it assigns that frequency to one of the filters. By default, the first eight frequencies are assigned to fixed filters, and the second eight are assigned to dynamic filters. Both types of filters can deepen if feedback reoc- curs at the same frequency. The frequency of a fixed filter will not change unless you manually clear all of the filters. However, if all filters are in use and an additional feedback frequency is detected, the DFR22 replaces the oldest existing dynamic filter with a new fil- ter at a new frequency.

Establishing the Auto Clear Function. To establish the Auto Clear function, proceed as follows:

NOTE: The procedure for setting up the Auto Clear function using the front panel controls differs slightly from the procedure in the DFR22 Windows software.

1.Ring out the sound system to set any feedback filters that you want to be a permanent part of the system equalization.

2.Press the Auto Clear button on the DFR22 front panel. The Auto Clear button will blink. Auto Clear will automatically re- designate any engaged filters as fixed and the rest as dynam- ic. For example, if you have five filters set, Auto Clear will des- ignate those as fixed and will designate the remaining 11 filters as dynamic.

3.The preset indicator will display a flashing [–h]. If you want Auto Clear to work automatically after a certain number of hours, you must use the Preset Select buttons to set the num- ber of hours (1 to 99). Each filter has its own timer, starting from the time it is set or changed. If you leave the preset indicator at [–h], Auto Clear will only work on a preset change or power cycle.

4.Press either the LOAD button or the AUTO CLEAR button again. The AUTO CLEAR LED will glow steadily.

5.When a preset is changed, or if power is turned off and on, the DFR filters will return to the state they were in when Auto Clear was engaged. If a number of hours was specified, each dy- namic filter and change to the depth of each fixed filter will be removed that many hours after it is set.

Disengaging the Auto Clear Function. To disengage the Auto Clear function, press the AUTO CLEAR button again. The Auto Clear LED will go out, and the number of fixed filters and dynamic filters will reset to eight of each type.

NOTE: Holding the clear button down while Auto Clear is engaged will only clear the dynamic filters.

Press to Lock / Hold to Clear

Pressing these buttons locks the filters at their current values. If Auto Clear is not engaged, holding them down for three seconds resets all filters. If Auto Clear is engaged, holding them down only resets dynamic filters. When the PRESS TO LOCK/ HOLD TO CLEAR LEDs are illuminated, the Lock function is engaged and no filters can be added or changed. Also, the Auto Clear timer is sus- pended.

Bypass DFR Filters

Pressing the DFR BYPASS button suspends the feedback reducer operation and bypasses existing feedback filters. It does NOT af- fect any other processors. When the DFR BYPASS LED illumi- nates, the feedback reducer is disengaged.

Changing Presets

The Preset Indicator on the front panel displays the number of the active preset. You can scroll through all presets stored in the device By pressing the arrow keys on the preset selector. When you select a preset number, the display blinks. If you press the LOAD button within five seconds, the device will make the selected preset the new Live preset. If you do not press the LOAD button, the preset will not change and the display will return to the original Live preset.

The preset indicator and controls are also used for setting the num- ber of hours after which each dynamic filter is removed when en- gaging Auto Clear.

Front Panel Lockout

When this DIP switch is in the “Unlock” position, all front panel con- trols are enabled. When it is in the “Lock” position, all front panel controls are disabled. However, all front panel indicators still func- tion and show the state of each parameter.

You can override this DIP switch using the DFR22 software and in- dividually enable or disable each button on the front panel of the DFR22. Access to the DFR22 via a computer can only be disabled by setting the appropriate security level through the DFR22 soft- ware.