Model DFR22 Installation Guide DFR22 Audio Processor with Feedback Reduction Processeur audio avec réduction de l’effet Larsen Audio-Prozessor mit Rückkopplungsreduzierung Procesador de audio con reductor de realimentación Processore audio con attenuatore di retroazione 2011 Shure Incorporated 27A15637 (Rev. 2) Printed in U.S.A.
! IMPORTANT SAFETY INSTRUCTIONS ! 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. READ these instructions. KEEP these instructions. HEED all warnings. FOLLOW all instructions. DO NOT use this apparatus near water. CLEAN ONLY with dry cloth. DO NOT block any ventilation openings. Install in accordance with the manufacturer's instructions. DO NOT install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
! WICHTIGE SICHERHEITSHINWEISE ! 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Diese Hinweise LESEN. Diese Hinweise AUFHEBEN. Alle Warnhinweise BEACHTEN. Alle Anweisungen BEFOLGEN. Dieses Gerät NICHT in der Nähe von Wasser verwenden. NUR mit einem sauberen Tuch REINIGEN. KEINE Lüftungsöffnungen verdecken. Gemäß den Anweisungen des Herstellers einbauen. Nicht in der Nähe von Wärmequellen, wie Heizkörpern, Raumheizungen, Herden oder anderen Geräten (einschließlich Verstärkern) installieren, die Wärme erzeugen.
! ISTRUZIONI IMPORTANTI PER LA SICUREZZA ! 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. EGGETE queste istruzioni. CONSERVATE queste istruzioni. OSSERVATE tutte le avvertenze. SEGUITE tutte le istruzioni. NON usate questo apparecchio vicino all'acqua. PULITE l'apparecchio SOLO con un panno asciutto. NON ostruite alcuna apertura per l'aria di raffreddamento. Installate l'apparecchio seguendo le istruzioni del costruttore.
ENGLISH DESCRIPTION The DFR22 Audio Processor with Feedback Reduction is a 2–input, 2–output digital audio processor. It is designed to equalize sound system response, provide dynamics processing and alignment delay, and automatically detect and control acoustic feedback. A built-in 2 X 2 matrix mixer allows either or both inputs to be routed to either or both outputs, with additional controls for levels and polarity.
ENGLISH OVERVIEW Front Panel DFR22 FRONT PANEL Figure 1 1. INPUT/OUTPUT Level Meters: – CLIP. Illuminates at 3 dB below clipping level. – 0 VU. +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 dB. Illuminates when the signal meets or exceeds the indicated level. – MUTE. Illuminates when input or output is muted. 5. BYPASS DFR FILTERS Button and LEDs.
ENGLISH DEFAULT PRESETS The DFR22 comes with three factory-configured presets. Although a computer is required to configure the DFR22’s equalizers, dynamics processors, delays, and crossover, you can use the DFR22 “out of the box” as an automatic feedback reducer, without connecting it to a computer. Preset 1: Provides two independent feedback reducers. The audio signal going to Input 1 is analyzed and filtered by a feedback reducer using up to 16 notch filters, and is then routed to Output 1.
ENGLISH DFR22 Theory Feedback Reduction No sound system (microphones + mixing/signal processing + power amplifiers/loudspeakers + room acoustics) has an absolutely flat frequency response. When the level of a sound system is increased, the frequencies at which peaks occur will be the first to exceed the feedback threshold. The DFR22 attenuates these frequencies, flattening the response of the sound system. The system can then operate at a higher overall level.
ENGLISH POWER AND INITIALIZATION Power Mains Connections Use the supplied power cable to connect the DFR22 Audio Processor to an active 100–240 Vac power source, as shown in Figure 6. The Power LED on the front panel will glow green when power is applied. Power Switch Note: Country Dependent Power LED DFR22 POWER CONNECTION Figure 6 Initialization Once power is applied, the DFR22 Audio Processor takes approximately 5 seconds to initialize.
ENGLISH 12 dB and 18 dB Output Pads Each DFR22 output has a 12 dB pad and an 18 dB pad that can be engaged through the software interface. Use these pads when connecting 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 digital-to-analog converters. The 12 and 18 dB pads act upon the signal after the digital-to-analog converters, so the meters do not reflect the pads.
ENGLISH 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 Table 2 for Device ID settings. IMPORTANT: Each Shure Link device MUST have a unique Device ID number. Table 2.
ENGLISH 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 SPECIFICATIONS Certifications Frequency Response Listed by Underwriters Laboratories, Inc.; Certified cUL (Canada). 20 Hz to 20 kHz ±1 dB Authorized under Verification provision of FCC Part 15 as a Class B Dynamic Range Digital Device. 110 dB minimum, A-weighted, 20 Hz to 20 kHz This Class B digital apparatus complies with Canadian ICES–003. Sampling Rate Conforms to European Union Directives, eligible to bear CE 48 kHz marking.
ENGLISH 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 Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
United States, Canada, Latin America, Caribbean: Shure Incorporated 5800 West Touhy Avenue Niles, IL 60714-4608 USA Phone: 847-600-2000 Fax: 847-600-1212 (USA) Fax: 847-600-6446 Email: info@shure.com www.shure.com ©2011 Shure Incorporated Europe, Middle East, Africa: Shure Europe GmbH Wannenäckestr. 28, 74078 Heilbronn, Germany Phone: 49-7131-72140 Fax: 49-7131-721414 Email: info@shure.
