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dbx AFS2 Owner's Manual
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dbx AFS2 Owner's Manual

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  • Page 1 Owner’s Manual...
  • Page 2 5. The foregoing is in lieu of all other warranties, expressed or implied, and dbx neither assumes nor authorizes any person to assume on its behalf any obligation or liability in connection with the sale of this product. In no event shall dbx or its dealers be liable for special or consequential damages or from any delay in the performance of this warranty due to causes beyond their control.

  • Page 3: Table Of Contents

    Application 3 – Mixer Master Inserts ��������������������������������������������������� 9 Application 4 – In-line Between Mixer & Amp���������������������������������10 The User Interface & Connectors �������������������������11 Front Panel �����������������������������������������������������������������������������������������������11 Rear Panel ������������������������������������������������������������������������������������������������13 Operating The AFS2 ������������������������������������������������14 Navigating & Modes Of Operation �����������������������������������������������������14 Home Mode ���������������������������������������������������������������������������������������14 Menu Mode����������������������������������������������������������������������������������������14 Wizard Mode �������������������������������������������������������������������������������������15 Menu Navigation Map ���������������������������������������������������������������������15...

  • Page 4: Overview

    • Allows you to store up to 5 user presets. We think you’ll agree that the AFS2 couldn’t be any easier to use and is up for any feedback suppression task you throw at it. Thanks for choosing dbx.

  • Page 5: Features

    Features • Latest dbx Advanced Feedback Suppression (AFS™) Technology • 24-Bit A/D, D/A Converters • 48kHz/24-Bit Internal Processing • 24 Programmable Filters w/Status LEDs per Channel • Stereo Linked or Dual Mono Operation • Live & Fixed Filter Modes • Selectable Live Filter Lift Times •...

  • Page 6: Installation

    NOTE: The +4 dBu/-10 dBV switch on the back panel of the AFS2 must be set to the correct position for your application in order to avoid performance issues. +4 dBu is referred to as ‘pro level’ and will be the correct setting for most applications, as most pro and semi-pro mixers will output a nominal level of around +4 dBu.

  • Page 7: Applying Power

    4� switch, an AC power strip or power conditioner can be used for switching power to the AFS2 on and off. Since the AFS2 consumes a relatively small amount of power, the unit may be left on continuously if required for the application.

  • Page 8: Application Guide

    AFS2 accordingly. If no insert points are available, then method 4 would be utilized. In this situation, be sure that the AFS2 input level allows the ‘20’ and ‘10’ LEDs to light as indicated above. If optimal level cannot be achieved, you can try raising the SENSITIVITY...

  • Page 9: Application 1 - Mixer Channel Inserts

    • Connect the mixer’s channel inserts to the AFS2. • Apply power to the system. Ensure that the amplifiers or powered speakers are turned on last. • Ensure the AFS2 is configured for dual mono (unlinked) operation, see ‘Linking/Unlinking Channels’ on page 18 for further information.

  • Page 10: Application 2 - Mixer Subgroup (Bus) Inserts

    • Apply power to the system. Ensure that the amplifiers or powered speakers are turned on last. • Ensure the AFS2 is configured for dual mono (unlinked) operation if processing two independent subgroups. If processing a stereo subgroup, the AFS2 should be configured for stereo (linked) operation. See ‘Linking/Unlinking Channels’ on page 18 for further information on this configuration option.

  • Page 11: Application 3 - Mixer Master Inserts

    This places the AFS2 before the master fader so that it can work optimally no matter where the master fader is set. If you have a system EQ, you can place it before or after the AFS2 in the chain. This application provides two channels of feedback suppression with up to 24 filters per channel.

  • Page 12: Application 4 - In-Line Between Mixer & Amp

    • Connect the main outputs of the mixer to the inputs of the AFS2. • Connect the outputs of the AFS2 to the power amplifier’s inputs or the next device in the chain if using a system EQ or active crossover.

  • Page 13: The User Interface & Connectors

    3. MENU/BACK Button Pressing this button from the Information View Home Screen in Home Mode will enter the AFS2 menus. Pressing it from the Filter Plot Home Screen will return to the Information View Home Screen. Pressing it when in any menu will move back one level in the current menu hierarchy.
  • Page 14 5. WIZARD Button Press this button to enter the Wizard, which will walk you through the entire AFS2 setup and ring-out procedure. 6. BYPASS Buttons Pressing these buttons will enable and bypass the AFS filters in each channel. When each button’s LED is lit, the channel is bypassed.

  • Page 15: Rear Panel

    NOTE: The +4 dBu/-10 dBV switch on the back panel of the AFS2 must be set to the correct position for your application in order to avoid performance issues. +4 dBu is referred to as ‘pro level’ and will be the correct setting for most applications, as most pro and semi-pro mixers will output a nominal level of around +4 dBu.

  • Page 16: Operating The Afs2

    There are three modes of operation in the AFS2, they are: Home Mode, Menu Mode, and Wizard Mode. Home Mode This is the operating mode which the AFS2 enters after power-up and initialization. There are two Home Screens which can be viewed from Home Mode. To toggle between the two available Home Screens, just press the wheel from Home Mode.

  • Page 17: Wizard Mode

    Live filters for automated protection during system use. See ‘Ringing Out The Sound System’ on page 19 for further information on using the Wizard. Menu Navigation Map The below navigation map shows the navigational hierarchy of the AFS2 and how to navigate the unit. Press the MENU/BACK button HOME MODE...

  • Page 18: The Afs Filters

    Upon switching to Live Mode, all Fixed filters will become truly ‘fixed’ . Fixed filters are just that, ‘fixed’ . They will remain set – even after power cycling the AFS2 – until they are cleared by the user or a different preset is loaded, in which case all set Fixed filters in the loaded preset will be set.

  • Page 19: Clearing Filters

    Clearing Filters The AFS2 gives you the ability to clear all AFS filters or only the Live filters. Clearing all filters allows you to start from scratch, for example when ringing out a system in a new venue. Clearing only the Live filters allows you to refresh a system for use, for example if you’re using the same system in the same venue, but act two is about to begin.

  • Page 20: Linking/Unlinking Channels

    Linking/Unlinking Channels Channels can be configured for stereo (linked) or dual mono (unlinked) operation. This option can be configured when you run the Wizard or manually from the System menu. NOTE: When linked, the parameters for both channels will be linked but AFS detection and filter placement will not. In other words, both channels will share the same parameter settings but feedback will be detected and notched out independently per channel.

  • Page 21: Ringing Out The Sound System

    The AFS2’s Wizard does a great job of taking the guesswork out of ringing out the sound system. However, you can also ring out the system manually.
  • Page 22 Slowly raise the main mixer faders (mixer master sends if ringing out stage monitors or subgroup faders if ringing out 12� subgroups) until you reach your target gain (described in step 3) or run out of Fixed filters, whichever happens first. HINT: When ringing out the system, it sometimes helps to start the ringing by triggering a sharp sound, such as a finger snap or clap.

  • Page 23: Presets

    Presets Saving Presets Up to 5 user presets can be stored in the AFS2 for later recall. When saving presets, the following settings will be saved: • All Set Fixed Filters (Gain/Q/Frequency values) • Fixed Filters Parameter Setting (number of Fixed vs. Live filters) •...

  • Page 24: Front Panel Lockout

    Front Panel Lockout The AFS2’s front panel controls can be locked to prevent unauthorized tampering. When the front panel is locked, a 4-digit PIN must be entered to unlock the unit and make any parameter changes. The PIN is a fixed number and is ‘1234’ .

  • Page 25: Factory Resets

    Factory Default Reset This reset option can be found in the PRESET menu and is used to reset all current AFS2 settings back to their factory default state. Note that this reset will not overwrite presets.

  • Page 26: The Menus & Parameters

    The Menus & Parameters AFS Options Menu The AFS Options menu houses all the parameters for the two channels. Following is a description of all the parameters found in this menu. [1, 2] CHANNEL This parameter selects the channel to edit. BYPASS [ON, OFF] This parameter bypasses the selected channel and will override the channel’s BYPASS button on the front panel.
  • Page 27 FIXED FILTERS [0 - 24] This parameter sets how many of the AFS filters will be allocated as Fixed filters. There are a total of 24 AFS filters available. The number of Live filters is the difference between the total number of filters and the number of Fixed filters. For example, if you select a FIXED FILTER setting of 12, you will have 12 Live filters available for use (24 - 12 = 12).
  • Page 28 VIRTUAL HIGH PASS [OFF, 30Hz - 500Hz] This parameter places a high pass filter in the AFS detector path. If you don’t want AFS to have the ability to set any filters below a set frequency (for example, if you don’t want AFS to notch any frequencies below 100Hz), adjust this parameter to the frequency below which you want AFS to ignore.

  • Page 29: Preset Menu

    This parameter determines the settings that will be loaded after power-up. If the CURRENT option is selected, the AFS2 will boot with the same settings it had when it was last powered down. If one of the PRESET options is selected, the AFS2 will always boot with the settings saved in the selected preset.

  • Page 30: Technical Information

    Technical Information Audio Cable Diagrams TO NEXT DEVICE (INPUT) TO NEXT DEVICE (INPUT) FROM SOURCE DEVICE (OUTPUT) FROM SOURCE DEVICE (OUTPUT) RING SLEEVE SLEEVE RING (COLD -) (GROUND) (GROUND) (COLD -) HOT + HOT + COLD - COLD - SLEEVE SLEEVE (HOT +) (HOT +)

  • Page 31: Dimensions

    Dimensions...

  • Page 32: Specifications

    Electronically balanced/unbalanced, RF filtered Impedance: Balanced >120Ω, unbalanced >60Ω Max Output Level: +20dBu A/D PERFORMANCE: Type: dbx Type IV™ conversion system Dynamic Range: >110dB A-weighted, >107dB unweighted, 22kHz BW Type IV™ dynamic range: >119dB, A-weighted, 22kHz BW >117dB, unweighted, 22kHz BW A/D Conversion:...
  • Page 34 Phone: (801) 566-8800 Website: dbxpro�com Support: dbxpro�com/en-US/support dbx Professional Products is a registered trademark of Harman AFS2 Owner’s Manual PN: 5047637-B © 2014 Harman All rights reserved...

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