Specifications

4
INTRODUCTION
The Shure Model DFR11EQ Version 5 is a single channel signal processor that combines an equalizer,
feedback reducer, limiter and delay in a single, half-rack enclosure. The DFR11EQ is designed to be placed in
a sound reinforcement signal path to allow equalization of the overall sound system response and automati-
cally detect and control acoustical feedback. The DFR11EQ is designed for installed sound reinforcement
applications, such as theaters, conference rooms, meeting halls or houses of worship. The DFR11EQ Version
5 is also an effective setup tool for controlling major feedback modes in live music applications.
The equalizer of the DFR11EQ can be set to act as a 30–band graphic or a 10–band parametric equalizer.
The 1/3-octave graphic equalizer can boost up to 6 dB or cut 12 dB for each band. The parametric equalizer
offers adjustable frequency, up to 6 dB of boost or 18 dB of cut, and up to a two octave bandwidth.
The feedback reducer of the DFR11EQ Version 5 automatically inserts narrow notch filters at de-
tected feedback frequencies. These notch filters stop a sound system from feeding back, but are narrow
enough so their effect on audio quality is minimized. The feedback detection algorithm constantly
searches for feedback, with or without the presence of program audio.
Hardware Features
S Crystal* 20-bit A/D and D/A converters (Analog-to-Digital, Digital-to-Analog) allows 104 dB of dynamic range.
S 48 kHz sampling rate provides flat response to 20 kHz.
S Onboard Scenes can be selected via front panel buttons.
S
1
/
2
rack space chassis allows rack mounting of one or two units in a single rack space with no sagging or bending.
S Shure Link Interface allows multiple Shure Link devices to be controlled with a single computer.
S There are no internal batteries. Settings and DSP program are stored in internal EEPROM.
S Electronically balanced input features combination
1
/
4
-in. and XLR connector and can be used with balanced or
unbalanced outputs.
S Independently driven, cross-coupled, balanced
1
/
4
-in. and XLR outputs can be used with balanced or unbalanced
inputs, without signal loss.
S Input and output levels are +4 dBu/–10 dBV DIP-switch-selectable.
S 88 MHz Motorola* DSP56009 processor engine features full 24-bit internal processing.
S RS-232 interface allows external computer control and firmware updates.
S Internal linear power supply is switchable between 120 and 230 Vac, eliminating the need for a cumbersome ex-
ternal power supply.
S Solid state bypass eliminates unreliable mechanical relays.
Software Features
S Adaptive Notch Filter algorithm (patent pending) automatically detects feedback and deploys up to 10 narrow band
notch filters.
S A tamper-proof equalizer can be switched between 30-band graphic or 10-band parametric equalizer.
S The graphic equalizer is a constant-Q, 30-band,
1
/
3
-octave graphic equalizer. It can boost up to 6 dB or cut 12 dB for
each band.
S The parametric equalizer offers 10 filters with adjustable frequency, up to 6 dB of boost or 18 dB of cut, and up to a
two octave bandwidth.
S Up to 1.3 seconds of Digital Delay.
S Front and back panels both feature lockout control.
S The Response Curve Viewer displays frequency response of the feedback reducer, equalizer, or both.
S 10 scenes can be stored on board. Multiple scenes can be stored to floppy or hard disk.
S The Limiter provides added protection to external speakers and amplifiers.
Table of Contents