Shure DFR22 User Manual

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DFR22 -- Audio Processor
General Description
The DFR22 Audio Processor with Feedback Reduction is a 2input, 2output
digital audio processor. It is designed to equalize sound system response,
provide dynamics processing and alignment delay, and automatically de
tect and control acoustic feedback. A builtin 2 X 2 matrix mixer allows ei
ther 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 set
up tool in live music applications. Using the DFR22s draganddrop graphi
cal user interface, processors can be placed anywhere in the signal path.
DFR22 Features
• Shure's patented digital feedback reduction algorithm:
◦ Now includes stereo DFR processing capability
◦ New Auto Clear mode clears dynamic filters after a preset change or power cycle. Dynamic filters can be au
tomatically removed after a specified number of hours.
• Configurable signal path with drag and drop Windows interface. 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.
• Phoenix and XLR connectors for each input and output
• Compatible with USB to serial port converters
• 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
• 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.
• Preset selector and indicator for up to 16 presets
• Control input pins for setting up remote preset, volume, and mute controls

Shure DFR22 Specifications

General

Brand	Shure
Model	DFR22
Category	Computer Hardware
Language	English

Summary

General Description

DFR22 Features

Packing List

Requirements

Power Requirements

Details the electrical power specifications for the DFR22 unit.

Computer Requirements

Lists the necessary hardware and software specifications for operating the DFR22 control software.

Software Installation

Using the DFR22 Software

Overview

Front Panel

Describes the controls and indicators present on the front panel of the DFR22.

Back Panel

Details the connectors and controls located on the rear panel of the DFR22.

Default Presets

Front Panel Control Functions

Auto Clear

Describes the Auto Clear function for managing dynamic and fixed feedback filters automatically.

Press to Lock/Hold to Clear

Explains how to lock filters or reset them using the dedicated button.

Bypass DFR Filters

Details how to temporarily disable the feedback reduction feature.

Changing Presets

Outlines the process for selecting and loading different presets.

Front Panel Lockout

Explains how to disable front panel controls for security or preventing accidental changes.

DFR22 Theory

Feedback Reduction

Explains the principle of feedback reduction and how the DFR22 addresses acoustic feedback.

DFR22 Limitations

Rack Mounting The DFR22

Power and Initialization

Power Mains Connections

Details how to connect the DFR22 to a power source.

Initialization

Describes the device's startup sequence and indicator behavior.

Audio Connections

Wiring Connectors

12 dB and 18 dB Output Pads

Explains the function and use of output attenuation pads.

Computer Connections

RS-232 Connections

Details how to establish serial communication between a computer and the DFR22.

Shure Link Network

DIP Switch Settings for Networked Devices

Device ID Settings

Provides a table mapping DIP switch positions to Shure Link Device ID assignments.

Control Pin Connections

Determining Control Pin Allocations

Guides on how to plan the assignment of control pins for various functions.

Preset Control Connections

Explains how to connect external hardware for preset selection.

Mute Control Connections

Details how to wire external switches for muting inputs or outputs.

Gain Control Connections

Describes how to connect potentiometers or switches for gain adjustment.

AMX/Crestron Control Connections

Explains how to connect the DFR22 to AMX or Crestron control systems.

Accessories

Furnished Accessories

Lists the accessories that are supplied with the DFR22 unit.

Optional Accessories

Lists optional accessories available for purchase or use with the DFR22.