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Summary of Contents for Harman dbx AFS 224
- Page 1 ™ u a l C h a n n e l A d v a n c e d F e e d b a c k S u p p r e s s i o n P r o c e s s o r User Manual...
- Page 2 IMPORTANT SAFETY INSTRUCTIONS WARNING FOR YOUR PROTECTION READ THE FOLLOWING: KEEP THESE INSTRUCTIONS HEED ALL WARNINGS The symbols shown above are internationally accepted symbols that warn of FOLLOW ALL INSTRUCTIONS potential hazards with electrical products. The lightning flash with arrowpoint in the apparatus shall not be exposed to dripping or splashing liquid and no object filled an equilateral triangle means that there are dangerous voltages present within with liquid, such as vases, shall be placed on the apparatus.
- Page 3 8760 S. Sandy Parkway Sandy, Utah 84070, USA Date: May 31, 2012 European Contact: Your local dbx Sales and Service Office or Harman Signal Processing 8760 South Sandy Parkway Sandy, Utah 84070 USA Ph: (801) 566-8800...
- Page 4 ™ Service / Warranty Service Contact Info If you require technical support, contact dbx Technical Support. Be prepared to accurately describe the problem. Know the serial number of your device - this is printed on a sticker attached to the chassis. If you have not already taken the time to fill out your warranty registration card and send it in, please do so now.
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Page 5: Table Of Contents
™ Table of Contents Introduction Defining the AFS 224 ............................2 Installation Recommendations .........................3 Connection Recommendations ........................3 Front & Rear Panels Front Panel ................................4 Rear Panel ................................5 Applications System Connection & Gain Structure ......................6 Application 1 – Mixer Channel Inserts ......................7 Application 2 –... -
Page 6: Defining The Afs 224
This manual will be your guide to understanding the full functionality of the powerful AFS 224 processor. Defining the AFS 224 The dbx AFS 224 provides the following features: • dbx’s Patent-Pending Advanced Feedback Suppression (AFS™) Technology •... -
Page 7: Installation Recommendations
™ Introduction and the proprietary, precision AFS filters remove only a fraction of the frequency spectrum. The following graph shows a comparison between AFS filters, the filters available in other feedback eliminators, and conventional graphic EQ filters: Competitor’s dbx AFS™ Feedback Elimination 1/3 Octave EQ... -
Page 8: Front & Rear Panels
™ Front & Rear Panels Front Panel Input Level Bar Graph These four LEDs indicate the input signal level of the AFS 224. Input level LEDs range from -10dBu to +18dBu. NOTE: For maximum performance and proper operation, the average input signal level should consistently light the 0dBu LED, with the +10dBu LED lighting occasionally. -
Page 9: Rear Panel
™ Front & Rear Panels Live Filter Lift Button 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: Lift Time Not Lit Lift Off Green 1 Minute... -
Page 10: Applications
™ Applications System Connection & Gain Structure The four basic ways to hookup the AFS 224 to your system are as follows: 1. Connected to the insert jack(s) on a microphone channel of a mixer. 2. Connected to the subgroup insert jack(s) of a mixer. 3. -
Page 11: Application 1 - Mixer Channel Inserts
™ Applications Application 1 – Mixer Channel Inserts This application provides dedicated feedback suppression directly on the microphone channels of a mixing console, thereby leaving other channels unaffected. This application provides two individual channels of feedback suppression with up to 24 filters per microphone channel. 1. -
Page 12: Application 2 - Mixer Subgroup Inserts
™ Applications Application 2 – Mixer Subgroup Inserts This setup is ideal for applications that require feedback suppression on certain instruments (such as Output to Power Amp Output to Power Amp microphones) while keeping instruments that desire feedback (such as guitars) separated. This application provides two channels of feedback suppression with up to 24 filters per channel. -
Page 13: Application 3 - Mixer Master Stereo Output Inserts
™ Applications Application 3 – Mixer Master Stereo Output Inserts This application provides feedback suppression over the entire mix using the master inserts on the mixing console. This application provides two channels of feedback suppression with up to 24 filters per channel. 1. -
Page 14: Application 4 - In-Line Between Mixer & Amp
™ Applications Application 4 – In-line Between Mixer & Amp This application is ideal for dedicated feedback suppression on the entire mix, when your mixer does not have master insert connections. This application provides two channels of feedback suppression with up to 24 filters per channel. -
Page 15: Operation
™ Operation Quick Start For best performance, it is recommended that you perform the following: • Ensure you have properly configured the AFS 224 for your application (i.e. dual mono operation or stereo linked operation). See “Linking Channels” for further information. • Ensure that the gain structure has been properly set. -
Page 16: Setup Mode
™ Operation Setup Mode The AFS 224 Setup Mode is used to set the total number of AFS filters available and allocate the number of Fixed verses Live filters available in each channel. The number of Live filters is the difference between the total number of filters and the number of Fixed filters (Live Filters = Total Number of Filters - Fixed Filters). - Page 17 ™ Operation Selecting the Number of Fixed Filters 12 Fixed Filters Green Allocated When in Setup Mode, use the channel <MODE> button(s) to toggle to the Set Number Fixed Filters Menu indicated by the selected channel’s <MODE> button lighting green. The current setting for the number of Fixed filters is indicated by the number of Filter LED’s lit for each channel.
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Page 18: Fixed Mode
™ Operation Fixed Mode The AFS 224 offers two main modes of operation: Fixed Mode and Live Mode. Fixed Mode is used to detect and remove feedback problems in the system due to microphone placement, room modes, etc.. Once set, these filters are stored in the AFS 224 (even after a power cycle) and are not removed until cleared by the user. -
Page 19: Live Mode
™ Operation Live Mode Live Mode allows feedback filters to be set and removed based on changes in the environment and is designed to be used during a performance. The AFS 224 can be put into Live Mode by pressing the <MODE>... -
Page 20: Other Functions
™ Operation Other Functions Clearing Filters To clear the Live filters, press and hold the <BYPASS> button on the selected channel for approximately two seconds. The currently assigned Live filter LEDs will flash. If you wish to clear only the Live filters, release the <BYPASS>... -
Page 21: Technical Information
™ Technical Information Factory Hard Reset In the event that you would like to set all parameters back to their factory default state, please perform the Factory Hard Reset procedure outlined below. WARNINg! Performing this reset will clear all set filters. Ensure the system’s gain is reduced and amplifiers are off before performing this procedure to ensure the system does not go into feedback once the filters are cleared. -
Page 22: Block Diagram
™ Technical Information Block Diagram AFS™ 224 User Manual... -
Page 23: Specifications
™ Technical Information Specifications Analog Inputs: Number of Inputs: Connectors: Female XLR and 1/4” TRS Type: Electronically balanced/unbalanced, RF filtered Impedance: Balanced 50kΩ, Unbalanced 25kΩ Max input line level: +20dBu CMRR: >40dB, typically >55dB @ 1kHz Analog Outputs: Number of Outputs: Connectors: Male XLR and 1/4” TRS Type: Electronically balanced/unbalanced, RF filtered Impedance:... - Page 24 8760 South Sandy Pkwy. Sandy, Utah 84070 Phone: (801) 568-7660 Fax: (801) 568-7662 Questions or comments? E•mail us at: customer@dbxpro.com or visit our website at: www.dbxpro.com 18-6398-B...
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