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dbx Pro AFS 224 manual

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Table of contents for the manual

  • Page 1

    User Manual D ual Channel Advanced Feedback Suppression Processor ® AFS ™ 224[...]

  • Page 2

    W ARNING FOR YOUR PROTECTION READ THESE INSTRUCTIONS: KEEP THESE INSTRUCTIONS HEED ALL W ARNINGS FOLLOW ALL INSTRUCTIONS DO NOT USE THIS APP ARA TUS NEAR W A TER CLEAN ONL Y WITH A DR Y CLOTH. DO NOT BLOCK ANY OF THE VENTILA TION OPENINGS. INST ALL IN ACCORDANCE WITH THE MANUF ACTURER’S INSTRUCTIONS. DO NOT INST ALL NEAR ANY HEA T SOURCES SUCH AS[...]

  • Page 3

    U.K. MAINS PLUG W ARNING A molded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facility . NEVER UNDER ANY CIRCUMST ANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET . Do not use the mains plug without the fuse cover in place. Replacement fuse covers can be obtai[...]

  • Page 4

    Ta b le of Contents AFS 224 Ta b le of Contents Defining the AFS 224 ..............................................i Service Contact Info ...............................................ii W arranty ..................................................................ii Installation Recommendations ...............................1 Basic Connections ...[...]

  • Page 5

    ® AFS 224 Operation AFS 224[...]

  • Page 6

    Intr oduction ® AFS 224 User Manual i AFS 224 Congratulations on your purchase of the dbx Professional Products AFS 224. The AFS 224 Advanced Feedback Suppression processor was designed to provide state-of-the-art feedback elimination processing, while maintaining a simple and intuitive control interface. From the powerful DSP module to the no-non[...]

  • Page 7

    ® Intr oduction AFS 224 AFS 224 User Manual For more information regarding dbx Advanced Feedback Suppression (AFS™) technology, please refer to the white paper section online at: www .dbxpro .com . If you require technical support, contact dbx Customer Service. Be prepared to accurately describe the problem. Know the serial number of your unit -[...]

  • Page 8

    Installation / Connections ® AFS 224 User Manual 1 AFS 224 a period of two years. A Return Authorization number must be obtained from dbx by telephone. The company shall not be liable for any consequential damage as a result of the product's use in any circuit or assembly. 4. dbx reserves the right to make changes in design or make additions [...]

  • Page 9

    Rear and F r ont P anels Operation AFS 224 ® AFS 224 User Manual 2 AFS 224 Rear Po w er Cord Receptacle: Connects AC power to the AFS 224. Input Connectors : Two types of input connectors are provided for input connections: female locking XLR type connectors, and 1/4” tip-ring-sleeve phone jack connectors. The maximum input level that the proces[...]

  • Page 10

    User Setup ® AFS 224 User Manual 3 Operation AFS 224 Live Filter Lift : Live Filter Lift provides maximum sonic integrity by removing unnecessary feedback filters. This button is used to select the live filter lift times and are indicated as follows: LED Lift Time Not Lit - Lift Off Green - 10 Seconds Y ellow - 10 Minutes Red - 60 Minutes Mode : T[...]

  • Page 11

    ® If no insert points are available, then method 4 would be utilized. In this situation, be sure that the AFS 224 input level allows the 0 and +10 dBu LEDS to light as indicated above. The input level to the amplifiers may have to be reduced in this situation so that they are not over- driven by the signal from the AFS 224. B – Setup Mode The AF[...]

  • Page 12

    User Setup ® 3 AFS 224 User Manual 5 Operation AFS 224 C-1 Ringing out a system Fixed mode filters are set before a perfor mance in a process called "ringing out a system". This is done after all other system EQ'ing has been done. First, bring down the main mix, turn off all music sources and open all the mics. Place the AFS 224 int[...]

  • Page 13

    User Setup Operation AFS 224 ® AFS 224 User Manual 6 D-1 Using Live Filter Lift Live Filter Lift provides maximum sonic integrity by removing unnecessary feedback filters. The Live Filter Lift function provides a timer for each of the Live Filters. This timer length can be adjusted by pressing the <LIVE FIL TER LIFT> button, and can be switc[...]

  • Page 14

    Application Guide Application 1 - Insert On the Microphone Channel This application is ideal for dedicated feedback suppression on microphone channels of a mix- ing console. This application provides the user with individual channels of 24 filter of feed- back suppression per microphone. 1. Connect the channel insert output from the mixer to the in[...]

  • Page 15

    ® Application 2 - Insert On the Main Stereo Outputs of a Mixing Console This application is ideal for dedicated feedback suppression on the outputs of a mixing con- sole. This application provides the user with dual channels of 24 filters of feedback suppres- sion per channel. 1. Connect the stereo output inserts of the mixer to the inputs of the [...]

  • Page 16

    Applications Guide ® 386 User Manual 9 Operation AFS 224 Application 3 - Insert on the Subgroups of a Mix er This setup is ideal for applications that require feedback suppression on certain instruments such as microphones, while keeping instrument that desire feedback (such as guitars) separat- ed. This application provides the user with dual cha[...]

  • Page 17

    ® Application 4- Connected Inline with the Outputs of a Mix er This application is ideal for dedicated feedback suppression on the outputs of a mixing con- sole. This application provides the user with dual channels of 24 filters of feedback suppres- sion per output channel of the mixing console. 1. Connect the outputs from the mixer to the inputs[...]

  • Page 18

    Block Diagram ® 386 User Manual 11 Operation AFS 224 AFS 224 Block Diagram TYPE IV™ A/D DSP Micro Processor Pro grammable Logic CLIP Detect Bypass T ype Live Filter Lift Mode Bypass T ype Input meter Input D/A RF Filter Live Filter Lift Mode RF Filter Outputs Inputs Filter meter LEDs Block diagram AFS 224 User Manual[...]

  • Page 19

    ® Analog Inputs: Number of Inputs: 2 Connectors: Female XLR and 1/4” TRS T ype: Electronically balanced/unbalanced, RF filtered Impedance: Balanced 50k Ω , Unbalanced 25k Ω Max input line level: +20dBu CMRR: >40dB, typically >55dB @ 1kHz Analog Outputs: Number of Outputs: 2 Connectors: Male XLR and 1/4” TRS T ype: Electronically bala[...]

  • Page 20

    ® 8760 South Sandy Pkwy . Sandy , Utah 84070 Phone: (801) 568-7660 F ax: (801) 568-7662 Questions or comments E•mail us at: customer@dbxpr o .com or visit our W orld Wide W eb home pa ge at: www .dbxpro .com 18-6398-A A Harman International Company[...]