Instruction/ maintenance manual of the product DFR22 Shure
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DFR22 Audio Processor with Feedback Reduction Model DFR22 Installation Guide 27 B8 81 3 ( Rev. ) 200 Shure Incorporated Printed in U.S.A..
! 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.
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.
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 .
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 .
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.
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.
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.
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 .
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.
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 .
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.
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.
An important point after buying a device Shure DFR22 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Shure DFR22 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Shure DFR22 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Shure DFR22 you will learn all the available features of the product, as well as information on its operation. The information that you get Shure DFR22 will certainly help you make a decision on the purchase.
If you already are a holder of Shure DFR22, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Shure DFR22.
However, one of the most important roles played by the user manual is to help in solving problems with Shure DFR22. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Shure DFR22 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
