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Shure DFR22 - page 1
DFR22 Audio Processor with Feedback Reduction Model DFR22 Installation Guide 27 B8 81 3 ( Rev. ) 200 Shure Incorporated Printed in U.S.A. ...
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Shure DFR22 - page 2
! IMPORT ANT SAFETY INSTRUCTIONS ! 1. READ these in structions. 2. KEEP the se instruct io ns. 3. HEED all warn ings. 4. FOLLOW al l instruct ions. 5. DO NOT us e this appara tus near wa ter . 6. CLEAN ONL Y with dry cloth. 7. DO NOT bl ock any venti lation open ings. Install in accordance w ith the manu- facturer's instru ctions. 8. DO NOT in ...
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Shure DFR22 - page 3
ENGLISH 1 DESCRIPTION Th e DFR22 Audio Processor with Feedback Reduction is a 2–input, 2–output digital audio processor . It is designed to equalize so und system response, provide dynamics processing and alignment delay , and automatically detect and control acoustic feedback. A built-in 2 X 2 matri x mixer allows either or both inputs to be r ...
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Shure DFR22 - page 4
ENGLISH 2 OVERVIEW Front Panel DFR22 FRONT P ANEL Figure 1 1. INPUT/OUTPUT Level Meters: – CLIP . Illuminates at 3 dB below clipping level . –0 V U . +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 . – –20 ...
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Shure DFR22 - page 5
ENGLISH 3 DEF AUL T 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 1: Provides two independ ...
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Shure DFR22 - page 6
ENGLISH 4 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 attenuate ...
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Shure DFR22 - page 7
ENGLISH 5 POWER AND INITIALIZA TION Power Mains Connections Us e the supplied power cable to connect the DFR22 Audio Proces- sor to an active 100–240 V ac 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, th ...
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Shure DFR22 - page 8
ENGLISH 6 12 dB and 18 dB Output Pads Each DF R2 2 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 dig ...
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Shure DFR22 - page 9
ENGLISH 7 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 T able 2 for De- vice ID settings. IMPORT ANT : Each Shure Link device MUST have a unique Device ID number . DIP SWITCH SETTINGS FOR NETWORKED DEVICES Figure 13 T able 2. DEVICE ID S ...
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Shure DFR22 - page 10
ENGLISH 8 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. ...
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Shure DFR22 - page 11
ENGLISH 9 SPECIFICA TIONS Frequency Response 20 Hz to 20 kHz ± 1 dB Dynamic Range 1 10 dB minimum, A-weighted, 20 Hz to 20 kHz Sampling Rate 48 kHz Digital-to-Analog, Analog-to-Digital Conversion 24 bit Impedance Input: 10 k Ω Output: 120 Ω Input Clipping Level +24 dBu minimum Output Clipping Level +24 dBu +12 dBu (with 12 dB pad) +6 dBu (with ...
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Shure DFR22 - page 12
ENGLISH 10 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 Rule s. These limits are designed to provide reasonable protection a ...
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Shure DFR22 - page 13
SHURE Incorporated http://www.shure.com 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- 121 2 Intl Fax: 847-600-6446 Europe, Middle East, Africa: Shure Europe GmbH, Phone: 49-7131-721 40 Fax: 49 -7131-721414 Asia, Pacific: Shure Asia Limited, Phone: 852-289 ...
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