DFR22
Audio Processor
with Feedback Reduction
2009 Shure Incorporated
27B8813 (Rev. 5)
Printed in U.S.A.
ENGLISH
DESCRIPTION
The DFR22 Audio Processor with Feedback Reduction is a 2–input, 2–output digital audio processor. It is designed to equalize sound system
response, provide dynamics processing and alignment delay, and automatically detect and control acoustic feedback. A built-in 2 X 2 matrix
mixer allows either or both inputs to be routed to either or both outputs, with additional controls for levels and polarity.
The DFR22 is ideal for installed sound reinforcement applications, such as houses of worship, theaters, and meeting facilities. It is also a
powerful setup tool in live music applications. Using the DFR22’s drag–and–drop graphical user interface, processors can be placed any-
where in the signal path.
DFR22 Features
S Shure’s patented digital feedback reduction algorithm:
S Front and back panel RS232 ports:
–
–
Now includes stereo DFR processing capability
–
–
3–pin Phoenix connector on back panel.
New Auto Clear mode clears dynamic filters after a pre-
set change or power cycle. Dynamic filters can be auto-
matically removed after a specified number of hours.
DB9 connector on front panel; requires only TX, RX, and
GND to be connected.
S Three pre–loaded presets:
S Configurable signal path with drag and drop Windows inter-
face. Includes graphic and parametric EQ, up to 10 seconds
of delay, compression, limiting, gating, automatic gain control,
ducking, and a fully configurable two–way crossover.
–
–
–
Preset 1: Two mono 16 filter DFRs.
Preset 2: A stereo 16 filter DFR.
Preset 3: A mono 16 filter DFR on each input. Each input
is routed to each output.
S Phoenix and XLR connectors for each input and output
S Compatible with USB to serial port converters.
S Preset selector and indicator for up to 16 presets
S Control input pins for setting up remote preset, volume, and
mute controls
SPAPoCwKerINCaGbleLIST
S Five 3-Pin Block Connector Terminals (for audio input/output
and RS–232 communication)
S 5-pin DIN ShureLink Cable
S One 6-pin Block Connector Terminals (for control inputs)
S 4 Rackmount Screws with Nylon Washers
S One DFR22 Software CD–ROM and Online User Guide
REQUIREMENTS
Power Requirements
S 100–240 Vac, 50/60 Hz
S 45 W maximum
Computer Requirements
S 20 MB of hard drive space
S CD ROM drive
NOTE: Processor speed and memory requirements vary, depend-
ing on the version of Windows and number of background applica-
tions you are running. Operating the DFR22 software simulta-
S RS–232 serial port and cable, or approved USB-to-Serial port
neously with programs such as SIA–Smaart or Gold Line TEFt
adapter*
requires a faster processor and more RAM. The chart below lists
the minimum requirements for running the DFR22 software with no
other applications––including virus protection, firewall, instant
messaging, or email––in the background.
S VGA monitor with 640 x 480/256 color, or higher resolution
S Mouse or other pointing device
Windows Version
98, Second Edition
NT
Processor Speed
Pentium 166 MHz
RAM
48 MB
64MB
Pentium 233 MHz
Pentium 300 MHz
Pentium 300 MHz
ME
64 MB
96 MB
128 MB
2000 Professional
XP Professional, Home Pentium 300 MHz
*Most USB-to-serial port adapters work well with the DFR22. To see the latest list of fully approved adapters, visit http://www.shure.com/mixers/models/dfr22.asp
SOFTWARE INSTALLATION
1. Insert supplied CD into your CD-ROM drive and follow the on-
screen instructions.
3. Type [D:/setup}, where “D” is your CD-ROM drive letter.
4. Click OK and follow the on-screen instructions.
2. If installation does NOT start automatically, click on the [Start]
button the the Windows taskbar and select [Run...] from the
pop-up menu.
USING THE DFR22 SOFTWARE
Instructions for the DFR22 software are available in PDF format on
the CD-ROM included with the system, or on the Shure web site at
NOTE: Register this product by filling out and mailing the enclosed
registration card, or register online at the Shure web site
about software updates as they become available.
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OVERVIEW
Front Panel
DFR22 FRONT PANEL
Figure 1
1. INPUT/OUTPUT Level Meters:
5. BYPASS DFR FILTERS Button and LEDs. Press these but-
tons to suspend feedback reducer operation and remove feed-
back filters from the audio path. When a Bypass LED illumi-
nates, feedback reduction is bypassed on the corresponding
channel. Bypass does not affect other processors (such as
equalizers, delay, limiters, etc.).
–
–
CLIP. Illuminates at 3 dB below clipping level.
0 VU. +4 dBu, –10 dBV; software selectable. 0 dB is equal to
+4 dBu by default. If the input or output sensitivity is
changed to –10 dBV using the DFR22 software, 0 dB
equals –10 dBV.
6. LOAD Button. Press this button to activate a selected preset.
–
–
–20 dB. Illuminates when the signal meets or exceeds the
indicated level.
7. PRESET Indicator. Shows the number of the currently active
preset. Blinks to show the number of the other presets in the
DFR22 when pressing the SELECT buttons.
MUTE. Illuminates when input or output is muted.
2. DFR Filter LEDs. Illuminate when individual feedback filters
are active. When a filter changes or is added, an LED flashes,
then stays on.
8. SELECT Buttons. Press to scroll through the presets stored
in the DFR22.
9. COMM LED. Flashes in unison with the feedback filter LEDs
when the detector is deploying a new filter or changing an ex-
isting one, and also blinks whenever the unit is communicating
with a connected computer.
3. AUTO CLEAR Buttons and LEDs. Press and release these
buttons to configure Auto Clear mode for each channel. Press
them again to activate Auto Clear. When an Auto Clear LED
illuminates, Auto Clear is active on its corresponding channel.
10. RS232 Port. Connects the DFR22 to a computer.
4. PRESS TO LOCK / HOLD TO CLEAR Button and LEDs.
Press this button to lock filters at their current values. Holding
this button down will reset all feedback filters, even if they are
locked. The LED lights to indicate that the lock is active.
11. POWER LED. Illuminates when 100–240 VAC power is is ap-
plied to the DFR22.
Back Panel
U.S. PATENT NO. 5,999,631
OTHER PATENT PROTECTION
APPLIED FOR
DFR22 REAR PANEL
Figure 2
1. Power Connector. Connects to 100–240 VAC power.
7. Output Connectors ( XLR). These active, cross–coupled,
balanced outputs can be used with balanced or unbalanced in-
puts. They can be switched between +4 dBu/–10 dBV line–lev-
el operation using the DFR22 software. Refer to the Audio
Connections section.
2. Shure Link Interface. Allows linking of up to 16 Shure Link de-
vices, which may be accessed by a computer.
3. 3-Pin RS-232 Port. Connects the DFR22 to a computer. For
use with DFR22 software and control systems. Refer to the
Computer Connections section.
8. Input Connectors (Phoenix). These active balanced inputs
can be used with balanced or unbalanced outputs. They can-
not be used simultaneously with an XLR connector for the
same input. They can be switched between +4 dBu/–10 dBV
line–level operation using the DFR22 software. Refer to the
Audio Connections section.
4. CONTROL IN Pins. Use control input pins for remote control
of preset switching, muting, and gain. Refer to the Control Pin
Connections section.
5. DIP Switches. Use Switches 1–4 to select a Shure Link De-
vice ID. Use Switch 5 to lock or unlock front panel controls. Re-
fer to the Front Panel Lockout section for information on lock-
ing front panel controls.
9. Input Connectors ( XLR). These active balanced inputs can
be used with balanced or unbalanced outputs. They cannot be
used simultaneously with a Phoenix connector for the same in-
put. They can be switched between +4 dBu/–10 dBV line–level
operation using the DFR22 software. See Audio Connections
section for more information.
6. Output Connectors (Phoenix). These active, cross–
coupled, balanced outputs can be used with balanced or un-
balanced inputs. They can be switched between +4 dBu/–10
dBV line–level operation, using the DFR22 software. Refer to
the Audio Connections section.
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DEFAULT PRESETS
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 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 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 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.
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
Establishing the Auto Clear Function. To establish the Auto
Clear function, proceed as follows:
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.
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.
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.
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.
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.
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.
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.
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.
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DFR22 Theory
Feedback Reduction
No sound system (microphones + mixing/signal processing + power amplifiers/loudspeakers + room acoustics) has an absolutely flat fre-
quency response. When the level of a sound system is increased, the frequencies at which peaks occur will be the first to exceed the feed-
back threshold. The DFR22 attenuates these frequencies, flattening the response of the sound system. The system can then operate at a
higher overall level.
The DFR22 includes Shure’s patented Adaptive Notch Filter algorithm that can discriminate between feedback and non–feedback sounds.
When this algorithm detects feedback, it inserts a shallow, narrow filter into the audio path, reducing gain at the frequency that is feeding back.
(See Figure 3.) This filter is called a notch filter, since it affects a narrow section of the audio spectrum. If the feedback does not stop, the filter
depth is increased. By default, filters in the DFR22 are deployed as HIGH Q filters. As a High Q filter gets deeper, its Q increases up to a Q of
101 (1/70th of an octave). Using the DFR22 software, you can also set filters to deploy as LOW Q. Low Q filters affect a slightly wider range of
frequencies by maintaining a Q of 14.42 (1/10th of an octave) as they deepen. By default, the DFR22 can insert up to 16 notch filters per
channel to reduce feedback.
The DFR22’s feedback reduction algorithm can be used as a tool during system setup and for peace of mind against unexpected feedback.
When setting up a sound system with the DFR22, you can ring out the system by slowly raising the gain while talking into the microphones
until the first frequency begins to feed back. The DFR22 will automatically insert a notch filter to attenuate that frequency. Once the system
stops feeding back, you can further raise the level and repeat the process for additional frequencies. Typically, you can raise the gain 3 – 9 dB
above the level at which feedback first occurred. You should leave some filters available to catch feedback that might occur later, when the
sound system is in use.
Measured Frequency Response with Peak
Measured Frequency Response with Notch Filter Added
EFFECTS OF NOTCH FILTER ON FREQUENCY RESPONSE
Figure 3
DFR22 Limitations
The DFR22 (or any other feedback reduction processor) will not let you to increase gain beyond the physical limits of the sound system. In
most cases, the point of diminishing returns is reached once 5 to 8 notch filters have been set. This is because there are usually only a few
dominant peaks in a system’s frequency response (Figure 4A). In most cases, you can expect a 6 to 9 dB improvement in gain-before-feed-
back. When you are ringing out a system and notice that many frequencies feed back simultaneously, even when you increase the gain
slowly, you have reached the point of diminishing returns. If the system still has insufficient gain before feedback at this point, other changes
must be made to the sound system, such as changing the placement of the microphones and/or loudspeakers.
= Feedback Threshold
Figure 4A
Figure 4B
Use notch filters to lower peaks
Lower overall system gain
FREQUENCY RESPONSE OF AN UNEQUALIZED SOUND SYSTEM
Figure 4
RACK MOUNTING THE DFR22
Mount the DFR22 in any standard 19-inch audio equipment rack,
using the supplied screws. Refer to Figure 5.
NOTE: Avoid mounting wireless equipment and power amplifiers
directly above or below the DFR22. Additional rack mount supports
may be necessary for mobile installations.
RACK MOUNTING THE DFR22
Figure 5
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POWER AND INITIALIZATION
Power Mains Connections
Use the supplied power cable to connect the DFR22 Audio Proces-
sor to an active 100–240 Vac power source, as shown in Figure 6.
The Power LED on the front panel will glow green when power is
applied.
NOTE: The DFR22 Audio Processor is designed to operate contin-
uously. Therefore, there is no power on/off switch.
..
Power LED
DFR22 POWER CONNECTION
Figure 6
Initialization
Once power is applied, the DFR22 Audio Processor takes approxi-
mately 5 seconds to initialize. When initialization is complete, the
Input/Output LEDs will flash, as shown in Figure 7. The DFR22 is
ready to use once the LEDs stop flashing.
DFR22 INITIALIZATION
Figure 7
AUDIO CONNECTIONS
NOTE: Audio will pass from the inputs to the outputs, even if it has
CAUTION: DO NOT connect equipment to both the Phoenix
and XLR connectors of the same input or output at the same
time. Doing so could damage the equipment.
not yet been configured through the computer interface.
Wiring Connectors
DFR22 XLR CONNECTORS (OUTPUT)
DFR22 XLR CONNECTORS (INPUT)
2
1
3
XLR
Male)
RCA
RCA
XLR
(Female)
Phone Plug
(Balanced)
Phone Plug
(Unbalanced)
Phone Plug
(Balanced)
Phone Plug
(Unbalanced)
DFR22 PHOENIX CONNECTOR OUTPUTS / INPUTS
XLR
Female)
XLR
Male)
RCA
Phone Plug
Phone Plug
(Balanced) (Unbalanced)
INPUT/OUTPUT CONNECTOR WIRING DIAGRAMS
Figure 8
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12 dB and 18 dB Output Pads
Each DFR22 output has a 12 dB pad and an 18 dB pad that can be
engaged through the software interface. Use these pads when con-
necting the DFR22 to lower-level inputs. They cannot be used to
prevent clipping at the output stage of the DFR22
NOTE: The Output meters indicate the signal level present at the
digital-to-analog converters. The 12 and 18 dB pads act upon the
signal after the digital-to-analog converters, so the meters do not
reflect the pads.
COMPUTER CONNECTIONS
RS-232 Connections
Connect the COM port on your computer to the 9-pin RS-232 con-
nector on the front panel of the DFR22, shown in Figure 9, using a
male-to-female serial cable. Pin outs for a 9–pin RS–232 cable are
shown in Figure 10 and listed in Table 1.
NOTE: Only the TX, RX, and GND pins need to be connected in
order to communicate with the DFR22.
RS-232
You can also connect a computer or control system to the 3–pin
RS-232 Phoenix connector on the back panel of the DFR22, as
shown in Figure 11.
IMPORTANT: You CANNOT connect two PCs to the DFR22 at the
same time. However, you CAN connect an AMX or Crestron sys-
tem and a PC to the DFR22 at the same time.
PHOENIX RS-232 SERIAL PORT CONNECTION
Figure 11
RS-232 SERIAL PORT CONNECTION
Figure 9
Table 1. RS-232 PIN OUTS
DFR22
––
COMPUTER
––
PIN NO.
COMPUTER 9-PIN RS-232
MALE CONNECTOR
9-PIN FEMALE
TO COMPUTER
1
2
3
4
5
6
7
8
9
TX
RX
RX
––
TX
DTR
GND
DSR
RTS
CTS
––
GND
––
DFR22 9–PIN RS-232
FEMALE CONNECTOR
9-PIN MALE
TO DFR22
––
––
RS-232 CABLE PINOUTS
Figure 10
––
Shure Link Network
Up to 16 Shure Link devices, including the DFR22, DFR11EQ,
DP11EQ, P4800, and UA888, can be linked and controlled from
one computer. Using 5-pin DIN cables, connect the Shure Link IN
and Shure Link OUT of each device, as shown in Figure 12.
NOTE: The last device in the chain MUST be connected to the
first device (the one connected directly to the computer) to
form a loop.
SHURELINK IN
DEVICE ID # 0
RS-232
DEVICE ID # 1
DEVICE ID # 2
SHURELINK OUT
SHURELINK NETWORK CONNECTIONS
Figure 12
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DIP Switch Settings for Networked Devices
Assign each Shure Link device a unique Device ID Number, using
DIP Switches 1–4, as shown in Figure 13. Refer to Table 2 for De-
vice ID settings.
Table 2. DEVICE ID SETTINGS
DIP Switch
DIP Switch
Device
ID
Device
ID
1
2
3
4
1
2
3
4
IMPORTANT: Each Shure Link device MUST have a unique
Device ID number.
0
1
2
3
4
5
6
7
DN DN DN DN
UP DN DN DN
DN UP DN DN
UP UP DN DN
DN DN UP DN
UP DN UP DN
DN UP UP DN
UP UP UP DN
8
9
DN DN DN UP
UP DN DN UP
DN UP DN UP
UP UP DN UP
DN DN UP UP
UP DN UP UP
DN UP UP UP
UP UP UP UP
10
11
12
13
14
15*
*Default setting.
DIP SWITCH SETTINGS FOR NETWORKED DEVICES
Figure 13
CONTROL PIN CONNECTIONS
The control pins on the back of the DFR22 connect to switches, potentiometers, and controller hardware. The Control Input pins can be used
to change presets, adjust gain, and mute channels.
NOTE: Use the DFR22 software to configure the control pins so that they match the attached control hardware. You can also use the software
to assign minimum and maximum gain values for each control, as well as the gain increment for up/down volume control buttons. Refer to the
Control Pin section of the Online Help or to the Online User Guide.
Determining Control Pin Allocations
Table 3. BINARY CONTROL PIN ALLOCATION
When allocating control pins, you should first determine which pins
are to be used for preset control. Any remaining pins can then be
used to adjust gain or to mute channels. The number of pins need-
ed for preset control depends on the type of control hardware used,
as well as the number of presets.
Number of Presets
Pin Numbers
2
4
1
1 and 2
8
1–3
16
1–4
The following methods can be used to allocate control pins:
S One-to-One: Use one pin for each preset, starting at Pin 1,
and proceeding toward the right. You MUST use consecutive
pins. Connect momentary or latching switches.
S Shure DRS10 Switch: Use Pin 1 for up to 10 presets.
S Custom Switch: Use Pin 1 for up to 10 presets.
S Binary: Use the pin numbers listed in Table 3. Connect latch-
ing switches.
Preset Control Connections
Various types of control hardware can be connected to the Control
Input pins, as shown in Figure 14. When properly configured, the
DFR22 changes to the appropriate preset in response to the
switch. Resistor values for custom switches and the Shure DRS10
are listed in Table 4.
One-to-one Configuration
(Each pin represents one preset)
NOTE: The total resistance of the cable run, from the switch to the
DFR22, should be less than 100 ohms. Two-conductor, unshielded
cable, such as a Belden 8442, is recommended.
Table 4. CUSTOM SWITCH RESISTOR VALUES
PRESET
RESISTOR VALUE
1
Binary Configuration
97 kΩ – ∞ Ω
44–60 kΩ
26–32 kΩ
2
3
4
17–20 kΩ
5
6
7
8
9
10
11.3–13.6 kΩ
7.8–9.3 kΩ
5.2–6.3 kΩ
3.3–4.1 kΩ
1.9–2.5 kΩ
0.63–1.1 kΩ
Shure DRS10 or Custom Switch Configuration*
WIRING CONTROL INPUT PINS FOR PRESET CONTROL
Figure 14
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Mute Control Connections
For mute control, use either a latching switch or a momentary
switch. The total resistance of the cable run from the switch to the
DFR22 should be less than 100 ohms.
Figure 15 shows an example of how to connect either a latching
switch or a momentary switch to the Control Input pins to mute an
input or an output.
Ground
Switch
(momentary or latching)
MUTE CONTROL PIN CONNECTIONS
Figure 15
Gain Control Connections
For gain control, use either a potentiometer or two momentary
switches (one for gain up and one for gain down). If you want to
have multiple sets of gain controls acting on the same inputs or out-
puts, use momentary switches connected in parallel. Figure 16
shows a typical connection between a potentiometer and the Con-
trol Input pins. Figure 17 shows a typical connection between two
momentary switches and the Control Input pins.
10kW Potentiometer
(Audio Taper)
GAIN CONTROL PIN CONNECTIONS USING A POTENTIOMETER
Figure 16
When using a potentiometer, the total resistance of the cable run
should be less than 100 ohms.
Switch
(momentary)
When using momentary switches, the total resistance of the cable
run should be less than 100 ohms.
NOTE: As supplied, the DFR22 control pins are configured for use
with a 10 Kohm audio taper potentiometer. However, you can use
the Potentiometer Calibration Wizard in the DFR22 software to
configure the DFR22 for use with any 10 Kohm, 20 Kohm, 50
Kohm, or 100 Kohm linear or audio taper potentiometer.
Ground
Switch
(momentary)
GAIN CONTROL PIN CONNECTIONS USING SWITCHES
Figure 17
AMX / Crestron Control Connections
You can connect an AMX or Crestron controller to the back panel
RS-232 port, using a Phoenix connector, or to the front panel
RS-232 port, using a DB-9 connector. In either case, you only need
to connect three wires: send, receive, and ground. See page 8 for
the pinout of the RS-232 ports.
To access AMX/Crestron control codes for the DFR22, visit the
DFR22 web page at http://www.shure.com/mixers/models/
DFR22.asp.
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SPECIFICATIONS
Frequency Response
Certifications
20 Hz to 20 kHz ±1 dB
cULus. Listed and cUL Listed to UL 6500 and CSA E60065. Au-
thorized under Verification provision of FCC Part 15 as a Class B
Digital Device.
Dynamic Range
110 dB minimum, A-weighted, 20 Hz to 20 kHz
Sampling Rate
This Class B digital apparatus complies with Canadian ICES–003.
48 kHz
Conforms to European Union Directives, eligible to bear CE
marking. Meets European Union Low Voltage Requirements:
Certified to EN 60065. Meets applicable tests and per-
formance criteria in European Standard EN55103 (1996) parts 1
and 2, for residential (E1) and commercial and light industrial
(E2) environments.
Digital-to-Analog, Analog-to-Digital Conversion
24 bit
Impedance
Input: 10 kΩ
Output: 120 Ω
Input Clipping Level
+24 dBu minimum
NOTE: EMC conformance testing is based on the use of sup-
plied and recommended cable types. The use of other cable
types may degrade EMC performance.
Output Clipping Level
+24 dBu
+12 dBu (with 12 dB pad)
+6 dBu (with 18 dB pad)
EMC conformance testing is based on the fact that the computer
is used for setup purposes only and disconnected during EMC
testing.
Total Harmonic Distortion
< 0.05%, +4 dBu, 20 Hz to 20 kHz
Propagation Delay from Input to Output
<1.5 ms
Polarity
Input to output: non-inverting (inverting optional)
Operating Voltage
100–240 Vac, 50/60 Hz (auto-switching), 1 A, maximum
Maximum Power Drain
45W
Temperature Range
Operating: –7_ to 49_ C (19_ to 120_ F)
Storage: –29_ to 74_ C (–20_ to 165_ F)
Dimensions
482.6 mm x 247.7 mm x 44.4 mm (19 in. x 9.75 in. x 1.75 in.)
(See Figure 18)
Weight
2.83 kg (6.25 lbs)
Furnished Accessories
Power Cable (DFR22) . . . . . . . . . . . . . . . . . . . . . . . . 95B8389
Power Cable (DFR22E) . . . . . . . . . . . . . . . . . . . . . . . 95C8247
5-pin DIN Shure Link Cable . . . . . . . . . . . . . . . . . . . . 95B8676
Hardware Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90AY8100
12 Block Connector Terminals, 3-pin
(for audio inputs and outputs)
2 Block Connector Terminals, 10-pin
(for control inputs and outputs)
4 Rackmount Screws and Washers
Optional Accessories
DRS10 Wallplate unit with 10-position rotary switch for preset
control
DFR22 DIMENSIONS
Figure 18
9
ENGLISH
Information to User
Changes or modifications not expressly approved by Shure Incorporated could void your authority to operate this equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
S Reorient or relocate the receiving antenna.
S Increase the separation between the equipment and receiver.
S Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
S Consult the dealer or an experienced radio/TV technician for help.
LIMITED TWO YEAR WARRANTY
Shure Incorporated (“Shure”) hereby warrants that this product will be free from defects in materials and workmanship for a period of two years
from the date of purchase. At its option Shure will repair or replace the defective product and promptly return it to you, or refund the purchase price.
You should retain proof of purchase to validate the purchase date and return it with any warranty claim.
If you believe this product is defective within the warranty period, carefully repack the unit, insure it, and return it postage prepaid to:
Shure Incorporated
Attention: Service Department
5800 W. Touhy Avenue
Niles, IL 60714-4608 U.S.A.
Outside the United States, return the product to your dealer or Authorized Service Center.
This warranty does not apply in cases of abuse or misuse of the product, use contrary to Shure’s instruction, or unauthorized repair. All implied
WARRANTIES OF MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE are hereby disclaimed and Shure hereby disclaims liabil-
ity for incidental, special, or consequential damages resulting from the use or unavailability of this product.
Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential damages,
so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state
to state.
10
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Intl Fax: 847-600-6446
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414
Asia, Pacific:
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055
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