AFS 224 DBX PDF

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The AFS Advanced Feedback Suppression processor was designed to provide the engineering staff at dbx have never been content residing in the. View and Download Dbx AFS user manual online. Dual Channel Advanced Feedback Suppression Processor. AFS Computer Hardware pdf manual. filters available, the AFS also offers selectable modes, live filter lift, and types of filtration, The dbx AFS provide the user with the following features.


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Date: 31, European Contact: Your local dbx Sales and Service Office or .. Congratulations on your purchase of the dbx AFS™ The AFS dbx AFS (AFS in line between mixer and amplifier) as shown below. . A little practice and experimentation will make you an AFS expert in no time. The AFS Advanced Feedback Suppression processor was designed to provide state-of-the art feedback elimination processing, while maintaining a simple.

This allows the proper signal level to be fed to the AFS without the chan- nel or output fader affecting the level as the fader is moved up or down. Page 12 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. Once in Live Mode, if feedback occurs a fil- ter will be set at the feedback frequency. Page Applications This application provides the user with individual channels of 24 filter of feed- back suppression per microphone. Connect the channel insert output from the mixer to the input of the AFS

Pdf afs 224 dbx

I remember when automatic feedback suppressors first appeared and were hailed by some, including me as a wonder of their age. Imagine having an invisible, unpaid extra pair of ears and hands constantly monitoring the PA for feedback problems and instantly applying selective EQ corrections as necessary, all without interrupting the performance or affecting the overall sound quality It all sounded too good to be true at the time, but it actually worked pretty well in many applications, and the detection algorithms have now evolved and become increasingly sophisticated The new Dbx AFS2 updates and replaces the well—established and successful AFS, which has been around for a few years now.

As a user of the previous model myself I was interested to have a look at its replacement in the product line. I like to have a feedback processor available for every job I do, in the same way as I like to have extra sets of batteries and every kind of mains power adaptor — I may not use them every time, or even all that often, but every so often a situation will arise where that extra capability can make all the difference between a horrendous, stress—filled experience and a successful result.

Much has been, and will continue to be, written about the reasons for and against using feedback processors, but I have always regarded them simply as automatic outboard EQ designed with a particular task — the control of feedback — in mind.

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With the AFS2 the team at Dbx have essentially taken the existing functionality of the AFS processor and developed new detection and control algorithms, along with an enhanced degree of user control and the ability to save and recall settings. What It Does In brief, the AFS2 has the ability to detect when feedback begins to occur at any particular frequency, and will insert a sharp notch filter into the signal path at that frequency.

You could think about the two types of filters as addressing different aspects of a live show, in that fixed filters are addressing major issues relating to the venue and stage layout, and live filters will cope with anything that happens post—soundcheck, such as increasing monitor levels, or physical changes like singers moving around close to monitors, or even taking the mic out front so that the audience can assist with the choruses!

The huge advantages that the AFS2 offers over manually applied EQ — including traditional graphic equalisers — is that the centre frequencies of the filters are calculated to be at exactly the required frequency. Consider what a traditional third—octave filter actually covers in terms of a musical scale!

Dbx afs pdf 224

The AFS2 does allow different filter types to be set for different filters — if you change the setting, it will only apply to new filters without changing any already set. Racking Up First off, the AFS2 is a well—built unit, with a neat and sturdy steel single-rack case, and the front and back layout is practical, simple and neat.

There are cooling vents on top above the power-supply area and at both sides, but no fan.

DBX AFS - Advanced Feedback Suppression

Feedback processors suppressors, eliminators, destroyers — whatever the makers prefer to call them are functionally fairly straightforward and have but one goal in life, which is to detect and control unwanted audio feedback. The AFS2 has two inputs and two outputs, which can be used independently or in linked stereo mode. A new feature of the AFS2, compared to its predecessor the AFS, is the provision of a USB socket for applying firmware updates — generally a comforting sign that the model will be staying in the current product range for a good long time, as new features and upgrades can be applied without replacing the hardware.

The front panel is neat, simple and effective, the traditional rows of filter LEDs and dedicated button array complemented with a small LED display screen and rotary selector, similar in size and style to those found on the 1U DriveRack models. The two horizontal rows of red filter indication LEDs are large and bright, and easily visible from several meters away.

Wave Your Wand The setup wizard first asks if the unit is to be operated in linked mode, where the same settings and filters are applied to both channels, or as two completely independent processors for example when used on bus or channel inserts , in which case you have to go through the wizard twice. Once that little formality is out of the way you can get on with the actual setup, which guides you through every step and is very easy to follow.

Pdf afs 224 dbx

Consider what a traditional third—octave filter actually covers in terms of a musical scale! The AFS2 does allow different filter types to be set for different filters — if you change the setting, it will only apply to new filters without changing any already set. Racking Up First off, the AFS2 is a well—built unit, with a neat and sturdy steel single-rack case, and the front and back layout is practical, simple and neat. There are cooling vents on top above the power-supply area and at both sides, but no fan.

Feedback processors suppressors, eliminators, destroyers — whatever the makers prefer to call them are functionally fairly straightforward and have but one goal in life, which is to detect and control unwanted audio feedback.

The AFS2 has two inputs and two outputs, which can be used independently or in linked stereo mode.

Blue Room technical forum: DBX Vs Sabine - Feedback destroyers - Blue Room technical forum

A new feature of the AFS2, compared to its predecessor the AFS, is the provision of a USB socket for applying firmware updates — generally a comforting sign that the model will be staying in the current product range for a good long time, as new features and upgrades can be applied without replacing the hardware. The front panel is neat, simple and effective, the traditional rows of filter LEDs and dedicated button array complemented with a small LED display screen and rotary selector, similar in size and style to those found on the 1U DriveRack models.

The two horizontal rows of red filter indication LEDs are large and bright, and easily visible from several meters away. Wave Your Wand The setup wizard first asks if the unit is to be operated in linked mode, where the same settings and filters are applied to both channels, or as two completely independent processors for example when used on bus or channel inserts , in which case you have to go through the wizard twice. Once that little formality is out of the way you can get on with the actual setup, which guides you through every step and is very easy to follow.

I like this feature as I know of several potential users of this unit who would appreciate this level of hand—holding.

The wizard then reminds you to bypass any active noise gates, and fully lower the main mixer outputs. The next step is to choose how many fixed and how many live filters will be used, and to make things simple the wizard asks if it should set the default number of 12 fixed filters.

When the fixed filters have been set and confirmed as all done, the AFS2 switches on the live filters, which will swing into action when feedback is detected from that point on.

DBX AFS224 FEEDBACK CONTROLLER 2CH

The live filters behave in a different way to the fixed set, and are designed to differentiate between sustained musical notes and unwanted feedback. Live Test I connected the AFS2 into our rehearsal studio PA and went through the setup wizard with four open mics to see both how effective the feedback reduction was, and what effect it had on the overall sound.

I used the default setting of 12 fixed filters and, as expected, I could set a significantly higher level in the room with the AFS2 than without it.

Pdf afs 224 dbx

I tried connecting the unit as an insert and in line between mixer and powered speakers, and I found no noticeable difference in performance between the two setups; the AFS2 seemed to be tolerant of varying input levels, although the manual sensibly recommends using inserts as these will deliver a suitable and fader—independent drive — so long as you have a couple of input-meter segments lit up it should work happily. The increase in available volume was impressive, and even with all 12 fixed filters set the resultant sound was fine.

The other thing I noticed about using the AFS2 was that even at volumes well below the feedback threshold, using it made the PA sound better, as all the worst excesses of the room response had been filtered and the result was a cleaner, clearer output.