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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:
– Now includes stereo DFR processing capability
– 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.
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.
S Phoenix and XLR connectors for each input and output
S Compatible with USB to serial port converters.
S Front and back panel RS232 ports:
– 3–pin Phoenix connector on back panel.
– DB9 connector on front panel; requires only TX, RX, and
GND to be connected.
S Three pre–loaded presets:
– 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 Preset selector and indicator for up to 16 presets
S Control input pins for setting up remote preset, volume, and
mute controls
PACKING LIST
S Power Cable
S 5-pin DIN ShureLink Cable
S 4 Rackmount Screws with Nylon Washers
S Five 3-Pin Block Connector Terminals (for audio input/output
and RS–232 communication)
S One 6-pin Block Connector Terminals (for control inputs)
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
S RS–232 serial port and cable, or approved USB-to-Serial port
adapter*
S VGA monitor with 640 x 480/256 color, or higher resolution
S Mouse or other pointing device
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-
neously with programs such as SIA–Smaart
or Gold Line TEFt
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.
Windows Version Processor Speed RAM
98, Second Edition Pentium 166 MHz 48 MB
NT Pentium 233 MHz 64MB
ME Pentium 300 MHz 64 MB
2000 Professional Pentium 300 MHz 96 MB
XP Professional, Home Pentium 300 MHz 128 MB
*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.
2. If installation does NOT start automatically, click on the [Start]
button the the Windows taskbar and select [Run...] from the
pop-up menu.
3. Type [D:/setup}, where “D” is your CD-ROM drive letter.
4. Click OK and follow the on-screen instructions.
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
www.shure.com.
NOTE: Register this product by filling out and mailing the enclosed
registration card, or register online at the Shure web site
(www.shure.com). Registration allows you to receive information
about software updates as they become available.