Page 1
Shure
Main Menu
Brothers Incorporated
222 Hartrey A
Evanston IL 60202-3696 U.S.A.
venue
Model DFR1
1EQ User Guide
DFR11EQ
Digital Feedback Reducer and Graphic Equalizer
With Software Interface for Windows
*
1996, Shure Brothers Inc.
27A8523 (PJ)
Printed in U.S.A.
Page 2
TABLE OF CONTENTS
Main Menu
INTRODUCTION 2
Features 2
Added
Features When Interfaced with a Personal Computer2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THE
DFR1
1EQ 3.
Overview 3
DFR11EQ Theory 5.
Setup
for Feedback Control7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting
COMPUTER
Overview 10
Software
Using
the Feedback Reducer Panel
Using
the Graphic Equalizer
Viewing
Exiting
the DFR1
Accessing
DFR11EQ
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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the DFR1
INTERF
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Functions
Response Curves
Connected DFR1
Settings
1EQ in a Sound System8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACE 10.
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1EQ Application
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1EQs 16.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.
13.
14.
15.
15.
17.
Scenes 18
APPENDICES 19
Appendix
Appendix
Appendix
Appendix
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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A. Specifications
B. Rack Mounting the DFR1
C. Connectors and Cables
D. W
arranty 25.
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1EQ 20.
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19.
21.
*Trademark Notifications
Shure is a registered trademark of Shure Brothers, Inc. Windows is a registered
trademark of Microsoft Corporation. Crystal is a trademark of Crystal Semiconductor
Corporation. Motorola is a registered trademark of Motorola, Inc. IBM is a registered
trademark
of the IBM Corporation.
1
Page 3
INTRODUCTION
Main Menu
The Shure Model DFR11EQ is a single channel signal processor that combines a
feedback
designed to be placed in a sound reinforcement signal path to automatically detect and
control
designed for installed sound reinforcement applications: theater, conference rooms,
meeting halls, etc. The DFR11EQ is also an effective setup tool for controlling major
feedback
detected
but
algorithm
The
and
computer control with the supplied Windows* interface software.
reducer and graphic equalizer in a single, half-rack enclosure. The DFR1
acoustical feedback and
modes in live music applications.
The feedback reducer of the DFR11EQ automatically inserts narrow notch filters at
feedback frequencies.
are narrow enough so their ef
constantly searches for feedback, with or without the presence of program audio.
feedback reducer functions on its own or under external computer control.
The
graphic equalizer of the DFR1
adjustable high pass and low pass filters. The graphic equalizer can be accessed via
1EQ is
equalize overall sound system response. The DFR1
These notch filters stop a sound system from feeding back,
fect on audio
1EQ is made up of thirty 1/3-octave, constant Q filters
quality is minimized. The feedback detection
1EQ is
Features
Adaptive Notch Filter algorithm (patent pending)
which automatically detects feedback and deploys
up to 10 narrow band notch filters.
Crystal* 20-bit A/D and D/A converters
(Analog-to-Digital, Digital-to-Analog) for 104 dB
dynamic range.
48 kHz sampling rate for flat response to 20 kHz.
1
/
rack space chassis allows rack mounting of
2
one or two units in a single rack space with no
sagging or bending.
Shure Link Interface allows multiple units to be
programmed with a single computer
No internal batteries. Settings and DSP program
stored in internal EEPROM chip.
Electronically balanced input with combination
1
/
-in. and XLR connector
4
balanced or unbalanced outputs.
. Can be used with
.
Independently driven, cross-coupled, balanced
1
/
-in. and XLR outputs. Can be used with
4
balanced or unbalanced inputs, without signal
loss.
+4 dBu/–10 dBV DIP-switch-selectable input and
output levels.
Motorola* DSP56009 processor engine with full
24-bit internal processing.
RS-232 interface for external computer control
and firmware updates.
Internal linear power supply switchable between
120 and 240 V
cumbersome external power supply
Meets UL, CSA, VDE, and CE requirements for
safety.
Solid state bypass eliminates unreliable
mechanical relays and switches.
Added Features When Interfaced with a Personal Computer
Tamper-proof,
graphic equalizer
dB for each band.
constant-Q, 30-band,
.
Can boost up to 6 dB or cut 12
1
/3-octave
Response Curve V
response of the feedback reducer
equalizer
ac eliminates the need for a
.
iewing. Displays frequency
, graphic
, or both.
Adjustable 12 dB/octave high pass and low pass
filtering.
Front/back panel lockout control.
Numerical display of active feedback filter
frequency and depth.
Storage of multiple scenes to floppy or hard disk.
2
Page 4
Q
Overview
Main Menu
Front Panel
THE DFR11E
BYPASS Button and LED. Press this button to
suspend feedback reducer operation and remove
filters from the audio path. Does not affect the
graphic equalizer. When the LED illuminates, the
feedback
reducer is bypassed.
SIGNAL LED. Illuminates when input signal is
present.
Intensity varies with input signal level.
CLIP LED. Illuminates when the input signal is
6 dB of clipping.
within
CLEAR Filters Button and LED. Press this
recessed button to reset all the feedback filters.
Clears filters even if Lock Filters is enabled. LED
illuminates
Back Panel
as the button is pressed.
LOCK Filters Button and LED. Press this button
to lock the filters at their current values. When the
LED is on, the unit will not change or add any
feedback
filters.
FILTERS LEDs (10). Indicate when individual
feedback
is
added, the LED flashes, then stays on.
filters are active.
When a filter changes or
NEW Filter LED. Flashes in unison with the
feedback
a
new feedback filter or changing an existing one.
POWER
the
on. When the power is off, the unit is bypassed
automatically.
filter LEDs when the detector is deploying
Switch and LED.
power on. LED illuminates when unit is powered
Press this button to
turn
Power Connector with Integral Fuse. Connects
to
the
9-Pin RS-232 Port. Connects the unit to a
computer.
DSP
Shure Link Interface. Allows linking of up to 16
DFR11EQs
DIP Switches.
AC power. The fuse is
connector.
For use with DFR11EQ software and for
firmware upgrades.
which may be accessed by computer
See
DIP Switches
located in the drawer below
.
.
Output Connector—
cross-coupled, balanced outputs can be used with
balanced or unbalanced inputs. Can be switched
between
switch. 1/4-Inch and XLR are driven independently
and either can be balanced or unbalanced without
affecting
+4 dBu/–10 dBV line-level operation by DIP
the other
Input Connector—Combined XLR and
balanced
Active
unbalanced outputs. Can be switched between +4
dBu/–10
3
dBV line-level operation by DIP switch.
1
/4-Inch & XLR. Active,
.
1
/4-Inch.
input can be used with balanced or
Page 5
DIP Switches
Main Menu
system requirements. Switches 5 through 10 change other available
below.
The
DIP switches located on the rear panel are used for adapting the unit to the sound
options,
DIP
SWITCH
1–4
5
6
7
8 unused — —
9
10
Device ID see below see below
Filter Bandwidth Select
Determines
Graphic Equalizer Defeat
Bypasses the graphic equalizer
Front Panel Lockout
Disables the front panel controls,
except the power switch. Protects
current settings from tampering.
Output Level
Input Level
FUNCTION POSITION
UP DOWN
High
the Q of the feedback
.
filter
.
narrows as it deepens
Front panel buttons
Q
1/10-octave
EQ On
Unlock
operational
+4 dBu
+4 dBu
see the table
Low Q
1/10-octave
widens as it deepens
EQ Of
f
Lock
Front panel buttons
inactive
–10 dBV
–10 dBV
Shure Link Device ID
When
multiple DFR1
15.
DIP switches 1 through 4 on the rear panel are used to set the Link Device ID. T
the
Device ID, align the switches according to the illustrations below
preset
to Device ID 15.
DEVICE
123
DEVICE ID 4
123
DEVICE ID 8
123
DEVICE ID 12
ID 0
4
4
4
1EQ’
s are linked, each one is assigned a Link Device
. The unit comes factory
SWITCH UP
DEVICE ID 1
123
DEVICE ID 5
123
DEVICE ID 9
123
DEVICE ID 13
4
4
4
SWITCH DOWN
DEVICE ID 2
123
DEVICE ID 6
123
DEVICE ID 10
123
DEVICE ID 14
4
4
4
ID, 0 through
o change
DEVICE ID 3
123
DEVICE ID 7
123
DEVICE ID 1
123
DEVICE ID 15
1
4
4
4
123
4
123
4
123
4
4
123
4
Page 6
DFR11EQ Theory
Main Menu
Feedback and DFR11EQ Operation
When
acoustical feedback occurs in a sound system, it is because the gain of the
is
too high. Since no sound system (microphones, loudspeakers, room acoustics, etc.) has
an absolutely flat frequency response, feedback will occur at specific frequencies before
others; these are the frequencies with the most gain. If the gain at only these specific
frequencies
back, without a perceptible dif
DFR11EQ.
At
discriminate between feedback and non-feedback sounds (speech and music). When this
algorithm
path
to reduce the gain at the frequency which is feeding back. If
the
filter depth is increased in 3 dB increments (up to –18 dB) until the feedback stops.
After the DFR11EQ stops the feedback at one frequency, the sound system may start
feeding back at another frequency. In this case, the DFR11EQ inserts another notch filter
into
the audio path at the new frequency
reduce
DFR11EQ Limitations
The
sound
is reached after 4 to 8 notch filters are set. This is because generally there are only a few
dominant
below).
dB improvement of gain-before-feedback in a typical system. However
much
out
all of the frequencies, better results will be obtained by lowering the gain of the system. If
the
system still has insuf
such as different microphone or loudspeaker placement. There are several excellent
publications which delve deeper into the issue of feedback and sound systems, including:
Acoustic Feedback – How to Avoid It, Vivian Capel, Bernard Babani Publishing, ISBN
0–85934–255–7; Sound Reinforcement Handbook
Leonard
Davis, Howard W. Sams and Co., ISBN 0–672–21857–7; “Understanding Sound System
Design”,
Matt
Anderson and Jon T
100
is lowered, then the system can operate with more overall gain before it
the heart of the DFR1
detects feedback, it smoothly inserts a –3 dB, 1/10-octave notch filter into the audio
feedback.
DFR1
1EQ (or any other notch filter system) cannot entirely eliminate feedback in a
system, it can only help to reduce it.
frequency
The DFR1
response peaks above the response of the entire system (see diagram
1EQ works very well controlling these peaks. The user can expect a 6 to 9
overall gain, then all of the frequencies have too much gain; instead of trying to notch
Publishing, ISBN 0–88188–900–8; Sound System Engineering
Rick Frank, Shure
system
feeds
ference in tonal quality
1EQ is a very
powerful algorithm that can accurately and quickly
. This is the operating principle of the
the feedback does not stop,
. The DFR1
1EQ can insert a total of 10 notch filters to
In a typical system, a point of diminishing returns
, if the system has
too
ficient gain, then other changes must be made to the sound system
, Gary Davis and Ralph Jones, Hal
Brothers, # AL1
, Don and
174; “Basic Handbook of Feedback Reduction”,
Carolyn
atooles, Shure Brothers, # AL 1280.
95
90
85
80
75
70
65
60 100 200 500 1000 2000
FREQUENCY (Hz)
5
5000 10000 20000
Page 7
Fixed and Dynamic Notch Filters
Main Menu
The
DFR1
1EQ can control the notch filters as either
10 notch filters are factory preset as 5 fixed and 5 dynamic filters. There is no difference
between
set and a new feedback frequency is detected, the DFR11EQ will remove the oldest set
dynamic filter and re-deploy it at the new feedback frequency. The fixed filters remain
unchanged.
fixed
adjusted
is
dominant
and loudspeaker placement, and will not change appreciably. However, feedback can still
occur, for instance, when someone’s hand or head approaches a microphone. A good
setting for this type of system would be 7 fixed filters for the non-changing feedback
frequencies,
has
dynamic
is different, some experimentation is recommended to get the best results from a given
sound
dynamic and fixed filters until all 10 filters have been set. After
However
filter
, the existing filter will deepen. The number of fixed versus dynamic filters can be
via the DFR1
An
example of
one that has fixed microphone and loudspeaker locations. In this type of system, the most
frequencies
and 3 dynamic filters to catch the feedback frequencies caused by the talker
On
the other hand, more dynamic than
several non-stationary wireless microphones.
in this type of system to obtain maximum feedback protection. As every application
system.
, if feedback occurs at the same frequency as an existing dynamic or
1EQ’
s Windows interface.
a system that would benefit from more fixed filters and less dynamic filters
of feedback are defined by the room dimensions and the microphone
High Q vs. Low Q Filters
The
DFR1
1EQ of
first,
High Q, is the default setting. A High Q
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 setting maintains the filter’s shape as it is deepened, so the width of the
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.
fers two selections for the shape of the 1/10-octave notch filters.
dynamic
fixed filters would be appropriate in a system that
Eight or even all 10 filters could be set to
filter’s width stays very narrow as the filter depth
or
fixed.
The
DFR1
all 10 notch filters are
1EQ’s
.
The
filter
Filter Locking
The
feedback filters can be locked from the front panel of the unit or from the computer
interface. When locked, new filters will not be deployed and existing filters will not be
deepened, even if feedback is detected. The DFR11EQ’s algorithm is designed to
accurately differentiate feedback from non-feedback sounds such as speech. However,
certain sounds such as electric guitar feedback or test tones, which sound like feedback,
may
cause the algorithm to deploy an unwanted filter
For
most applications, locking the feedback filters is unnecessary
the application will contain material which sounds similar to acoustic feedback, then it is
prudent
to lock the filters after ringing out the sound system.
6
.
. As a rule of thumb,
if
Page 8
Setup for Feedback Control
Main Menu
The DFR11EQ will operate stand-alone as a feedback reducer. However, when
connected to a personal computer running the supplied DFR11EQ software, additional
options
the
is a preemptive measure in which the system gain is raised beyond the normal setting to
deliberately make the system feed back. The DFR11EQ will then set its filters, and the
system gain is then reduced slightly, and the system is stable and useable. This set-up
method
an
system, but filters are not set prior to use. The DFR11EQ adds extra insurance against
feedback:
catch it. This set-up method is used for systems which already have sufficient
gain-before-feedback, but need protection from the occasional stray feedback which can
occur
Setup
1.
2.
are available. See
There
are two basic ways in which to set-up the DFR1
“Insurance Policy” method. Both are valid for dif
is primarily used for systems which are operated near the feedback point and need
extra margin of stability
For the “Insurance Policy” method, the DFR11EQ is simply installed in the sound
the system is not expected to feed back, but if it does, the DFR1
due to non-stationary microphones or user-adjustable gain controls.
Connect the DFR1
Computer Interface
.
1EQ in the desired signal path location. See
In a Sound System.
Set the input and output level DIP switches to the appropriate settings for the
sensitivities of the connected equipment.
for details.
1EQ: The “Ring Out” method and
ferent situations. The
“Ring Out” method
1EQ is there to
Connecting the Unit
WARNING:
of
f if the DFR11EQ input is set to +4 and the output is set to –10. If the DFR1
input is set to +4 and the output is set to –10, then the DFR1
attenuator
DFR1
receive too strong a signal. It is recommended that you avoid using this setting.
3.
Set the system gain to minimum, and power up all of the equipment.
4.
Slowly raise the gain of the system, and set the gain of each microphone to achieve
the desired level.
5.
The red CLIP LED should illuminate only on the highest signal peaks. If it illuminates
more frequently
the level of the signal coming into the DFR1
6.
At this point it is highly recommended to equalize the sound system with the
DFR11EQ’
equalizer
sound system.
Other equipment may potentially be damaged after DFR1
, lowering the signal to the proper level for the power amplifier. If the
1EQ is turned of
, check to see that the input level switch is set properly
s built–in graphic equalizer (see
. The DFR1
f, this attenuation is bypassed and the power amplifier will
1EQ.
Computer Interface
1EQ’
s feedback reducer is more ef
Ringing Out the System (“Ring Out” method only)
1. If
necessary, clear any notch filters in the DFR1
T
urn of
f the BYP
2.
Slowly raise the gain of the signal going through the DFR1
occurs, the DFR11EQ will insert a filter deep enough to stop the system from feeding
back.
3.
Repeat step 2 until all fixed filters are set. (There are 5 fixed filters, unless changed
by the user via the computer interface.)
4.
Lower the gain by 3 to 6 dB to stabilize the sound system.
ASS and LOCK LEDs if they are not already of
1EQ by pressing the CLEAR button.
1EQ power
1EQ
1EQ is acting as an
. If it is, lower
) or an external
fective on a well–equalized
f.
1EQ. When feedback
Power Down
When power is removed from the DFR11EQ, all settings (graphic equalizer, feedback
filters, button states) are automatically saved to the DFR11EQ’s internal non-volatile
memory.
On power up, all settings are recalled automatically
7
.
Page 9
Connecting the DFR11EQ in a Sound System
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Main Menu
The
DFR1
1EQ should be placed where an equalizer would be in a signal path — it should
be the final piece of equipment a sound signal passes through before going to a power
amplifier.
placed
flexibility,
sound system.
NOTE
Between the Mixer Main Output and the Power Amplifier
input
will affect all input channels. This setup is ideal for using the DFR11EQ as a feedback
reducer
Other signal processors (for example, delay or reverb ef
before the DFR1
1EQ along the signal path.
fects devices) should be
The following four diagrams show typical connections. Because of its utility and
the DFR1
1EQ can be connected in a large
variety of dif
ferent setups to benefit a
: See Appendix C. for descriptions of all cable and connection wiring.
The DFR11EQ is most commonly placed between the main output of a mixer and the
of a power amplifier
and as a graphic equalizer
, after any dynamics control processors. At the main output, the
.
unit
LINE IN
LINE
OUT
At a Subgroup Insert
When
using a multiple bus mixer, the DFR1
insert. The unit will affect only the channels associated with that subgroup: the other
channels
SUB SEND
SUB RETURN
will remain unaf
LINE
OUT
MAIN
MIXER
fected.
LINE
DFR11EQ
LINE OUT
IN
LOUDSPEAKER
POWER AMPLIFIER
1EQ can be connected to a single subgroup
LINE
IN
LINE
DFR11EQ
IN
POWER
AMPLIFIER
MIXER
LINE OUT
LOUDSPEAKER
8
Page 10
Inserted in an Input Channel
Main Menu
If
only a single microphone is creating feedback problems, the DFR1
on that channel alone. This is especially useful for wireless microphones, because the
constant movement of a performer may bring the microphone too close to the sound
reinforcement
loudspeakers.
1EQ can be inserted
LINE
IN
CHANNEL 1 IN
CHANNEL 1
INSERT
LINE
OUT
WIRELESS RECEIVER
MIXER
LINE
OUT
MAIN
Inserted Between Mixer and Monitor
Since monitor loudspeakers and microphones are usually in close proximity, the
DFR11EQ can be connected to stabilize a monitor system. Place a DFR11EQ on the aux
output which goes to the monitor loudspeaker. For multiple monitor mixes, a DFR11EQ
should
be placed at the output of each monitor send.
LINE OUT
DFR11EQ
LINE IN
POWER AMPLIFIER
LOUDSPEAKER
AUX 1
OUT
MIXER
AUX
OUT
LINE
IN
LINE
IN
2
DFR11EQ
LINE OUT
LINE
IN
DFR11EQ
LINE OUT
LINE IN
MONITOR
POWER AMPLIFIER
MONITOR
LOUDSPEAKERS
9
Page 11
OMPUTER INTERFACE
Main Menu
Overview
This section describes the Windows based computer interface software which allows
you
to utilize the full features of the Shure DFR1
computer, you can access additional control features to customize the operating
characteristics of the feedback filters. The computer interface also allows access to the
built-in digital, 30-band,
equalization curves can be displayed in the frequency response graph for an accurate
display
of either the feedback filter response, EQ response, or both combined.
1
/3-octave, constant-Q, graphic equalizer. The resulting
1EQ.
By connecting the DFR1
1EQ to your
Minimum Computer Requirements
The
following are the minimum requirements to run the Shure DFR1
One 486DX 33MHz IBM*-compatible computer (math coprocessor required)
2 MB hard drive space
4 MB RAM
Windows version 3.1x, or greater
1 available RS-232 serial (COM) port
One
RS-232 cable to connect the COM port of the computer to the DB-9 connector of
the
DFR1
1EQ
1EQ software.
Connecting the DFR11EQ to a Computer via the RS-232 (COM) Port
Before connecting the DFR11EQ to the computer, determine whether the computer’s
RS-232 (COM) port is 9-pin or 25-pin. Use the proper cable (purchased separately). For
RS-232
cable diagrams, see
TO COMPUTER
RS-232 CONNECTOR
Appendix C. Cables and Connectors.
TO DFR11EQ
RS-232 CONNECTOR
(9-PIN MALE)
1. Connect
2.
Connect the other end of the cable to the RS-232 port of the computer
the 9-pin plug (male) of the cable to the RS-232 port of the DFR1
10
1EQ.
.
Page 12
Networking Multiple DFR11EQs via the Shure Link Interface
Main Menu
Up
to 16 DFR1
unit
comes supplied with one 5-pin DIN cable for linking.
DFR11EQ
1EQ’
s can be linked together and controlled from a single computer
#1
DFR11EQ #2 DFR11EQ #3
. Each
TO
COMPUTER
1. Assign
(see
NOTE:
be
2.
Using the supplied 5-pin DIN cable, connect the Shure Link OUT of the first unit (the
LINK OUT LINK IN
each unit a Device ID (0 through 15) via the DIP switches on the rear panel
Shure Link Device ID
Multiple units can be
controlled simultaneously
one connected directly to the computer) to the Shure Link IN of the next unit. Repeat
this connection for each unit to be networked.
connected from its Shure Link OUT to the Shure Link IN of the first unit.
creates the loop necessary for all of the networked units to communicate with the
computer.
NOTE: Although a standard MIDI cable can be used to link units, Shure Link is not MIDI
compatible.
Software Installation
1. Insert
2.
3.
4.
NOTE: Remember to register your software by filling out and mailing the enclosed
registration card, or online via the Shure World Wide Web site (“http://www.shure.com”).
This
as
they become available.
the supplied 3.5-in floppy disk into the disk drive of your computer
With Windows active, click on the
In the
Run
disk.
Shure Setup will suggest a destination on your hard disk for the DFR1
Shure Setup will check the computer hardware to ensure that a coprocessor is
present. Setup will also prompt you for your name and organizational information.
will ensure that you receive information about
window
LINK OUTLINK IN LINK OUTLINK IN
, in the
Hardware
section of this manual).
assigned the same Device ID, enabling those units to
.
The last unit in the chain should be
This
.
File
heading of the main menu, then click on
Run...
, type “a:\setup”, where “a” is the drive containing the Shure Setup
1EQ files.
software updates with additional features
The Shure DFR11EQ Program Group
The
DFR1
and
a Readme file
DFR11EQ
1EQ program group contains the main application icon, a Windows Help file,
with up-to-date information. T
o launch the application, double-click on the
icon.
11
Page 13
Software Functions
Main Menu
Main Menu Bar. Through the main menu bar, you
can configure the computer connection to the
DFR11EQ, and access other windows for
configuring
scenes.
Feedback
Panel
on
the
Feedback Reducer panel allows you to view the
frequency and depth of individual filters, mute the
sound
the DFR11EQ, setting filters, and saving
Reducer
contains many of the
front panel of the DFR11EQ. In addition, the
system, or bypass the graphic equalizer.
Panel.
The Feedback Reducer
same controls available
Graphic Equalizer. The Graphic Equalizer Panel
allows the DFR11EQ to act as a constant-Q,
30-band,
of
boost and 12 dB of cut per band.
and low frequency cut filters with a 12 dB/octave
rolloff are included for setting the bandwidth limit
the sound system.
1/3-octave graphic equalizer with up
Additional high
to 6 dB
of
Frequency Response Curves. The Frequency
Response Viewer allows you to accurately display
the frequency response of the feedback filters, the
graphic
EQ, or the combined response of both.
12
Page 14
Using the Feedback Reducer Panel
Main Menu
Feedback Reducer (DFR) Bypass Button and LED
Pressing
removes
LED illuminates, the feedback reducer is bypassed. This is identical to the front panel
BYPASS
its filters from the audio path. It does not affect the graphic equalizer
button and LED.
the
EQ Bypass Button and LED
Pressing
audio path. This button does not affect feedback reducer operation. When the LED
illuminates,
DIP
switch.
the graphic equalizer is bypassed. This is
the EQ bypass button removes the graphic equalizer filters from the
Mute Button and LED
To
mute the audio signal of the DFR1
will
illuminate and no sound will pass through.
Clear Filters Button and LED
Click
on the
active
even if
filters.
This is identical to the
DFR11EQ.
Lock Filters Button and LED
Click on the LOCK button to lock the filters at their current values. The LED
illuminates
change
button
when the lock is active. The DFR1
the depth of any existing feedback filters.
and LED on the front panel of the DFR1
DFR
bypass button suspends the feedback reducer operation
identical to the rear panel EQ Bypass
CLEAR
LOCK
1EQ, click on the
button to clear all feedback filters. The Clear
filters is
active. The LED illuminates as the DFR clears the
CLEAR
button and LED
1EQ will not set any new filters or
MUTE
button. The LED
on the front panel of the
This is identical to the
1EQ.
and
. When the
function is
LOCK
Feedback Filters Button and LED
Connect Button and LED
As on the front panel of the unit, there are 10
LEDs representing each of the 10 feedback
filters.
The
LEDs illuminate from left to right, with
the
LEDs on the left representing the fixed filters.
click on the right and left arrows to either side of the filter LEDs. This will move the red
arrows above and below the selected filter LED. When a filter is selected, the current
frequency
displayed in the FREQ. field is the exact frequency which has been feeding back. The
DEPTH field shows the feedback filter depth required to reduce the feedback at that
frequency.
units
and depth of
Clicking the CONNECT button brings the DFR11EQ plugged in to the
computer
CONNECT
green
are operating without the computer interface and the software is running of
that filter will appear in the FREQ. and DEPTH fields. The number
online, along with any other DFR1
automatically selects the unit connected to the computer
LED illuminates, the connected units
In order to view the settings of a specific filter,
1EQs netwoked via Shure Link.
. When
are online. When the LED is of
13
the
f, the
fline.
Page 15
Using the Graphic Equalizer
Main Menu
Adjusting Bands
The DFR11EQ graphic equalizer looks and functions just like a
conventional graphic equalizer. Each slider controls a
centered
is
There are two ways to adjust the sliders:
Using
Or
in
Using the computer keyboard...
keyboard
keys
adjust the level by 3 dB increments.
selects the sliders
to adjust the level by 0.5 dB increments. Us the [Page Up] and [Page Down] keys to
Low-Frequency Roll-Off
The
Low frequency roll-off
To
adjust the Low frequency roll-of
can
also use the ← and → keys on the computer keyboard to move this slider
1
/3-octave band
around the frequency indicated above each slider
selected, the center of the slider turns green.
the mouse pointer
you can point and click on the band, which will adjust the level up or down
3 dB increments.
from left to right. When the desired slider is selected, use the
slider determines the corner frequency of the highpass filter
f, click and drag the slider to the desired frequency. Y
...
drag and drop the slider to the desired level.
pressing the [Tab] on the computer
. When a slider
↑ ↓
.
ou
.
High-Frequency Roll-Off
Flat Button
The
High
frequency roll-off
To
adjust the High frequency roll-of
can
also use the ← and → keys on the computer keyboard to move this slider
The Flat
button resets all the sliders, bringing them back to the 0 dB position.
slider determines the corner frequency of the lowpass filter
f, click and drag the slider to the desired frequency
14
.
. Y
ou
.
Page 16
Viewing Response Curves
Main Menu
DFR Response Curves
Clicking on the DFR button displays the feedback filter frequency response
curve
filters.
Here you can check the frequency and depth of each filter
EQ Response Curves
Clicking on the EQ button displays the graphic equalizer frequency
response
equalizer.
on the
graph. This curve shows the response of all deployed feedback
curve on the graph. Use this curve as an aid in setting up the graphic
.
Both
Clicking on the BOTH button displays the composite response of the
equalized
graphic
sound is af
equalizer and the deployed feedback filters. Here you can see how the
fected by the feedback filters.
Exiting the DFR11EQ Application
To Exit
1. Click
2.
on
File
Select the
in the main menu bar
Exit
option of the drop-down menu.
.
15
Page 17
Accessing Connected DFR11EQs
Main Menu
Configuring the Computer Serial Port
1. Launch
2.
Click on
3.
Click on the
4.
In the
5.
Click on the OK button.
NOTE: The COM port selection is saved in the DFR11EQ file, and will not need to be
selected
the DFR1
Setup
DFR1
again unless you need to change the hardware configuration.
1EQ software.
in the main menu bar
COM port
1EQ Serial Port
option of the drop-down menu.
window
.
, select an available COM port on the computer
.
Accessing the Connected DFR11EQs
To bring the networked DFR11EQ’s online, click on the CONNECT button of the DFR
panel. Or, select the
The
program searches for each unit connected in
ID
of each.
Connect
option of the
Shure Link Device ID Selection
DFR11EQ’s
Shure
Link Device IDs, see
the same settings from the computer. To access Units with different Device ID’s, you will
need
to select the Device ID from the main menu.
T
o select a Device ID:
1.
Click on
the Device IDs of all the connected DFR1
2.
Click on the desired Device.
The
Device ID will appear beside the DFR1
indicating
are addressed by their Shure Link Device ID. For instructions in assigning
Shure Link
Device ID
that all the units with that Device ID will receive computer commands.
in the main menu bar
Setup
Device ID
. A drop-down menu will appear showing
1EQs.
drop-down menu of the main menu bar.
the network, reading the Shure Link Device
. Units with the same Device ID will receive
1EQ heading at the top of the main window
,
16
Page 18
DFR11EQ Settings
Main Menu
The
DFR11EQ Settings
setting
fixed and dynamic filters. T
1.
Click on
2.
Select the
Options
DFR1
window contains options for controlling the DIP switches and
o access the
in the main menu bar
1EQ Settings
... option of the drop-down menu.
DFR1
1EQ Settings
.
window:
DIP Switch Override and Disable
Clicking
Defeat, and Front Panel Lock/Unlock DIP switches to prevent tampering. Once the
switches
and Front Panel Lockout options will be controllable from the computer. The DIP switch
override
NOTE: Because the computer bypassing of the graphic equalizer is DIP switch controlled,
computer control of the graphic equalizer automatically locks out the DIP switches on the
unit.
Setting
Filter
Bandwidth DIP switch options
Low
Q, see
Locking
front
panel buttons of the DFR1
The
Front Panel lockout does not af
on the
override and disable
does not af
High Q or Low Q Filters...
DFR1
the Front Panel...
DIP switches override and disable
is activated, an X will appear in
fect the input and output level DIP switches.
1EQ Theory
.
Clicking on the
1EQ hardware. Lockout is indicated by an X in the
Setting Fixed and Dynamic Filters
DFR11EQ feedback filters are set in one of two modes:
definitions
with
window:
1. Click
2.
3. T
4.
of these two modes, see
5 fixed and 5 dynamic filters.
To change number of Fixed and Dynamic filters from the
on the
DFR Filters
Place the cursor in the
ype in the desired number of fixed filters. The remaining filters automatically
become dynamic.
Click on the OK button to accept the changes.
DIP switches override and disable
field.
Number of Fixed DFR Filters
box disables the
the box and the High Q/Low Q
The High Q
on the back of the unit. For definitions of High Q and
fect the Power button.
DFR1
and Low Q options are the same as the
Front panel lockout
1EQ Theory
.
The DFR1
DFR11EQ Filter Parameters
box to activate the
field by using the mouse.
Filter Bandwidth, EQ
box will deactivate the
box.
Fixed or Dynamic.
1EQ comes factory preset
Number of Fixed
For
DIP
17
Page 19
Scenes
Main Menu
Once
a DFR1
stored
on disk as a Scene. Although the DFR1
internal
time
sound
stored
memory
when multiple units require similar settings.
system, or events which require changing settings “on
on the computer for later recall.
To Store a Scene in the DFR11EQ
The DFR11EQ stores one scene in its internal non-volatile memory. This scene is
automatically
any settings, the computer can simply be disconnected from the DFR11EQ, and the
DFR11EQ
will retain the settings.
1EQ has been set up with a desired combination of settings, they can be
, other scenes can be saved to disk. Scenes are useful for reducing setup
saved in the DFR1
1EQ automatically saves the current scene in
Scenes are also useful for multi-purpose
the fly”. Up to 16 events may be
1EQ upon power down. After any adjustments are made to
To Save a Scene to Disk
Scenes
save
a scene:
1.
Click on
2.
Select the
3.
On the
Name
4.
Click on the
are saved to the DFR1
File
in the main menu bar
Scene
s... option of the drop-down menu.
Scene Dialog
field.
Save Scene
To Recall a Scene from Disk
Once
a scene has been saved, the Windows software can be used to reload that scene
from
disk and recall it to a DFR1
1.
Click on
Select the
2.
3.
On the
for a drop-down list of available scene names.
4.
Select the desired scene name.
5.
Click on the
File
in the main menu bar
Scenes...
Scene Dialog
Recall Scene
To Delete a Scene from Disk
1. Click
2.
3.
4.
5.
on
File
in the main menu bar
Select the
On the
for a drop-down list of available scene names.
Select the desired scene name.
On the
Scenes...
Scene Dialog
Scene Dialog
1EQ.INI
window type a name (8 characters maximum) in the
button.
1EQ. T
option of the drop-down menu.
window
option of the drop-down menu.
window
window
, click on the arrow key beside the
button.
, click on the arrow key beside the
, click on the
file located in the Windows system directory
.
o recall a scene:
.
Scene Name
.
Scene Name
Delete Scene
button.
Scene
field
field
. T
o
18
Page 20
Appendix A. Specifications
Main Menu
Frequency Response
20 to 20k Hz ± 1.0 dB re 1 kHz
Dynamic Range
104 dB minimum, A-weighted, 20 Hz to 20 kHz
Sampling Rate
48 kHz
Digital-to-Analog, Analog-to-Digital Conversion
20 bit resolution
Voltage Gain
–1 dB ± 1dB (power off)
0 dB ± 2 dB (equal input and output sensitivities)
12 dB ± 2 dB (input –10 dBV, output +4 dBu)
–12 dB ± 2 dB (input +4 dBu, output –10 dBv)
Impedance
Input: 47 kΩ ± 20% actual
Output: 120 Ω ± 20% actual
Input Clipping Level
+18 dBu minimum (at +4 dBu setting)
+6 dBu minimum (at –10 dBV setting)
Output Clipping Level
+18 dBu minimum (at +4 dBu setting)
+6 dBu minimum (at –10 dBV setting)
T
otal Harmonic Distortion
< 0.05% at 1 kHz, +4 dBu, 20 to 20 kHz
LED Signal Indicators
Clip: 6 dB down from input clipping
Delay from Input to Ouput
< 1.0 ms, all filters set to Flat
Polarity
Input to output: non-inverting
XLR: pin 2 positive with respect to pin 3
1
/4-in. TRS: tip positive with respect to ring
Operating V
DFR11EQ: 108 to 132 Vac, 50/60 Hz
DFR11EQE: 216 to 264 Vac, 50/60 Hz
NOTE: This product is not disconnected from the mains
power supply when the POWER switch is in the Off
position.
Temperature
Operating: 0_ to 60_ C (32_ to 140
Storage: –30_ to 70_ C (–22_ to 158
Fuse
DFR11EQ
DFR11EQE
In
order to change a blown fuse, remove the power cord
and
Dimensions
219 mm x 137 mm x 40 mm
8 5/8 in x 5 3/8 in x 1 3/4 in
oltage
Range
_ F)
_ F)
:120 VAC. Fuse: 100 mA, 250V time delay.
: 250 VAC. Fuse: 50 mA, 250V time delay
pry open the drawer with a flathead screwdriver.
FUSE
APPENDICES
Weight
930 g (2.5 lbs)
FEEDBACK FIL
Ten (10)
to 20 kHz
Deployed to 1 Hz resolution of feedback frequency
Deployed in depths of 3 dB, 6 dB, 9 dB, 12 dB, and 18
dB attenuation
Filter shape variable between HI Q and LOW Q (see
High Q vs. Low Q Filters.
GRAPHIC EQUALIZER
Frequency Bands
30 bands on ISO, 1/3-octave centers
Filter T
Maximum Boost
Maximum Cut
CERTIFICATIONS
FURNISHED ACCESSORIES
Power Cable (DFR1
Power
5-pin
Single
Dual
Straddle
3.5”
ype
1
/3-octave, constant-Q
6 dB per band
12 dB per band, highpass and lowpass filters
DFR11EQ:
C22.2
FCC Part 15 as a Class B Digital Device.
DFR11EQE: Conforms to European Union Directives,
eligible
Voltage
Meets
EN 50 081-1 (1992) [EN 55022]. Meets European
Union EMC Immunity Requirements EN 50 082–1
(1992): [RF radiated (IEC 801–3) meets Criterion A;
ESD meets Criterion B; EFT (IEC 801–4) meets
Criterion
Cable (DFR1
DIN Shure Link Cable
Mount Rack Bracket
Mount Rack Bracket
Bars
Floppy disk
TERS
1
/10-octave adaptive notch filters from 60 Hz
UL Listed and cUL Listed
No. 1. Authorized under V
to bear
Requirements: VDE GS-Certified to EN 60 950.
European Union EMC Emissions Requirements:
CE marking. Meets European Union Low
B].
This symbol indicates that dangerous voltage
constituting a risk of electric shock is present
within
this unit.
This
symbol indicates that there are important
operating and maintenance instructions in the
literature
accompanying this unit.
1EQ) 95A8389.
. . . . . . . . . . . . . . . . . .
1EQE) 95A8247.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
to UL 813 and CSA
erification provision
95A8676.
53A8450.
53B8442.
53B8443.
of
84A003.
19
Page 21
Appendix B. Rack Mounting the DFR11EQ
Ñ
Main Menu
The DFR11EQ comes in a 1/2-rack chassis specially designed for sturdiness. The
sagging and bending found in most
straddle
bars are designed to ensure that the units will be installed securely
WARNING:
Single Unit
1. Align
2.
the supplied rack-mount brackets over the holes.
Fasten with the 8 supplied screws.
Dual-Mounted Units
1
/2-rack designs is eliminated — the brackets and
Do not torque the screws too tightly
.
, or the chassis may be damaged.
1. Align
2.
NOTE
3.
two units side by side so that the front panels both face the same direction.
Place the supplied straddle bars in the recesses on the top and bottom of the units,
so that they overlap both. Fasten with the supplied screws.
: Be sure to use both straddle bars when installing dual units.
Position the rackmount brackets over the holes in the side of the unit. Fasten with
the supplied screws.
Mounting in an Equipment Rack
SINGLE MOUNT
1. Insert
2.
the unit(s) into a 19-inch equipment rack.
Fasten the unit(s) to the rack using all four of the supplied screws.
DUAL MOUNT
20
Page 22
Appendix C. Connectors and Cables
Main Menu
NOTE:
Except for the Shure Link cable, none of the cables shown come supplied with the
DFR11EQ.
Audio Connectors
DFR11EQ Audio Input
Connector:
(XLR
and
1/4-inch
combined)
Configuration: activ
Actual
Impedance:
Nominal
Input Level:
Maximum
Input Level:
Pin
Assignments:
Voltag
e /
Current/
m P
Phanto
Protection?
ower
XLR (female)
e b
alanced activ
47 kΩ 47 kΩ
+
4 dBu
(+
4 i
npu
t l
–1
0 dBV
(–1
0 i
npu
+1
8 d
(+
4 i
npu
t l
+
6 d
(–1
Pi
Bu
0 i
npu
n 1 = g
Pi
n 2 = h
n 3 = cold
Pi
yes yes
evel)
t l
evel)
Bu
evel)
t l
evel)
round
ot
1/4-inch
phone plug
(female)
e b
+
4 dBu
(+
4 i
npu
–1
0 d
(–1
0 i
npu
+1
8 d
(+
4 i
npu
+
6 d
(–1
0 i
npu
Ti
p = h
ring = cold
sleev
e = g
alanced
t l
evel)
BV
t l
evel)
Bu
t l
evel)
Bu
t l
evel)
ot
round
DFR11EQ Audio Output
Connector:
(XLR
and
1/4-inch
separate)
Configuration: activ
Actual
Impedance:
Nominal
Output Level:
Maximum
Output Level:
Pin
Assignments:
Voltag
e /
Current/
m P
Phanto
Protection?
ower
XLR (male)
e b
alanced
cross coupled
120 Ω 120 Ω
+
4 d
(+
(–1
(+
(–1
Pi
Bu
4 o
utpu
t l
–1
0 d
BV
0 o
utpu
t l
+1
8 d
Bu
4 o
utpu
t l
+
6 d
Bu
0 o
utpu
t l
n 1 = g
round
Pi
n 2 = h
n 3 = cold
Pi
yes yes
evel)
evel)
evel)
evel)
ot
1/4-inch
phone plug
(female)
activ
e b
alanced
cross coupled
+
4 d
(+
(–1
(+
(–1
sleev
Bu
4 o
utpu
–1
0 d
BV
0 o
utpu
+1
8 d
4 o
utpu
+
6 d
Bu
0 o
utpu
Ti
p = h
ring = cold
e = g
t l
evel)
t l
evel)
Bu
t l
evel)
t l
evel)
ot
round
Audio Cables
XLR (male) to XLR (female)
The
variety of connectors on audio equipment sometimes leads to confusion in cabling.
The
diagrams below provide cabling recommendations for most
The
following is not a complete list, only a sample of some of the more commonly used cables
common cabling situations.
and applications. Some of the equipment in a given sound system may have different
pinouts
than the given examples. Consult the documentation for that equipment.
PIN 2
PIN 3
PIN
PIN 3
+
1
PIN 1
TYPICAL APPLICA
Mixer Line Out to DFR1
DFR1
–
PIN 2
+
DFR1
DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
–
TIONS
1EQ Input
1EQ Input
21
1EQ Input
Page 23
1
Main Menu
/4-in. to 1/4-in. Balanced
SLEEVE
RING –
SLEEVE
1
/4-in. to 1/4-in. Unbalanced
SLEEVE
SLEEVE
1
/4-in. Balanced to 1/4-in. Unbalanced
SLEEVE
TIP
TIP
RING –
+
+
RING –
TIP
TIP
TYPICAL APPLICA
Mixer Line Out to DFR1
+
DFR1
DFR1
DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
TIONS
1EQ Input
1EQ Input
1EQ Input
+
TYPICAL APPLICA
Mixer Line Out to DFR1
DFR1
DFR1
DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
TIONS
1EQ Input
1EQ Input
1EQ Input
XLR (male) to 1/4-in. Balanced
SLEEVE
SLEEVE
TIP
PIN 2
PIN 3
+
+
TIP
+
–
RING –
TIP
+
PIN
TYPICAL APPLICA
Mixer Line Out to DFR1
DFR1
DFR1
DFR1
1
TYPICAL APPLICA
DFR1
DFR1
DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
Mixer Line Out to DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
TIONS
1EQ Input
1EQ Input
1EQ Input
TIONS
1EQ Input
1EQ Input
1EQ Input
22
Page 24
XLR (female) to 1/4-in. Balanced
Main Menu
PIN
PIN 2
1
+
XLR (female) to 1/4-in. Unbalanced
SLEEVE
PIN 3
PIN
PIN 3
–
1
–
SLEEVE
RING –
TIP
+
TIP
PIN 2
TYPICAL APPLICA
Mixer Line Out to DFR1
DFR1
DFR1
DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
TIONS
1EQ Input
1EQ Input
1EQ Input
+
+
TYPICAL APPLICA
Mixer Line Out to DFR1
DFR1
DFR1
DFR1
1EQ Output to Amplifier Input
1EQ Output to Mixer Sub Return
Mixer Send to DFR1
Mixer Sub Send to DFR1
1EQ Output to Mixer Sub Return
TIONS
1EQ Input
1EQ Input
1EQ Input
Y-adapter cable, 1/4-in. Balanced to 1/4-in. Unbalanced
TIP
RING –
+
SLEEVE
RCA to 1/4-in. Unbalanced
SLEEVE
TIP
SLEEVE
+
TIP
+
TYPICAL APPLICA
Mixer Send/Return (Insert) to DFR1
Input and Output
TYPICAL APPLICA
DFR1
1EQ Output to Amplifier Input
TIONS
TIONS
1EQ
23
Page 25
Digital Connectors and Cables
Main Menu
Computer Interface — 9-Pin to 9-Pin RS-232 Cable
9-PIN FEMALE
TO COMPUTER
9-PIN MALE
TO DFR11EQ
54321
987
6
6
54321
987
COMPUTER 9-PIN RS-232
CONNECTOR MALE
DFR11EQ RS-232
CONNECTOR FEMALE
6
54321
987
54321
987
6
Computer Interface — 9-Pin to 25-Pin RS-232 Cable
11 9
25-PIN FEMALE
TO COMPUTER
9-PIN MALE
TO DFR11EQ
13
25
54321
7
68
1012
54321
68
119713
10 12
FUNCTION
141516 18
COMPUTER 25-PIN RS-232
14151618
202224
1921
17
23
54321
987
6
CONNECTOR (MALE)
DFR11EQ RS-232
CONNECTOR FEMALE
19 21
17
54321
987
20 22 24
23
6
25
—
RX
TX
DTR
GND
DSR
RTS
CTS
—
FUNCTION
—
RX
TX
DTR
GND
DSR
RTS
CTS
—
9-PIN CONNECTOR
PIN #
1
2
3
4
5
6
7
8
9
PIN
#
1
2
3
4
5
6
7
8
9
25-PIN CONNECT
PIN #
8
3
2
20
7
6
4
5
22
OR
Shure Link Cable — 5-Pin DIN Cable (MIDI-compatible cable)
FUNCTION
54321
54321
SHURE LINK IN
—
DATA
SHIELD
DATA
—
54321
54321
SHURE LINK OUT
PIN
#
1
2
3
4
5
24
Page 26
Appendix D. Warranty
Main Menu
Warranty
Shure Brothers Inc. (“Shure”) hereby warrants that these products will be free from
defects
option, Shure will repair or replace the defective product and promptly return it to you, or
refund
it
carefully
Distribution
model
establish
or
unless requested to do so by Shure’s Service Department. Any returned items must have
prior authorization. Unauthorized returns are delayed in handling; these delays can be
avoided
previously manufactured products. Shure also reserves the right to ship new and/or
improved products which are similar to the form, fit and function of the originally ordered
products.
in material and workmanship for a period of one year from the date of purchase. At its
the purchase price. Retain proof of purchase to validate the purchase date and return
with any warranty claim. If you believe this product is defective within the warranty period,
repack the unit, insure it, and return it postpaid to:
Shure Brothers Inc.
Attention: Service Department
222 Hartrey A
Evanston, IL 60202-3696 U.S.A.
For service outside the United States, return the product to your authorized Shure
Center
All
claims of defects or shortage should be directed to the above address.
number
warranty
part numbers and a
by contacting Shure in advance and furnishing the necessary information.
Shure reserves the right to make design changes and product improvements on any
.
, date, place and proof of purchase (such as a copy of your sales receipt) to
. Y
our letter should include all pertinent details
brief description of the problem. Do not mail any units or parts to Shure
venue
Please furnish
including applicable model
25
Page 27
Notes
Main Menu
26
Page 28
Main Menu
The Sound of Professionals...W
Shure
Brothers Incorporated
222 Hartrey A
Evanston, IL 60202–3696 U.S.A.
venue
orldwide
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