Arx Afw 30 User manual

AFW 30

ANTI-FEEDBACK WORKSTATIONTM

EQUALIZER, PEAK LIMITER, SABINE FBX FEEDBACK SUPPRESSION

Tuning and calibrating an audio system,

whether it’s for a conference or a concert,

isacomplexprocedureatthebestoftimes!

Simply stopping feedback is only a part of

it - you still need to adjust the actual fre-

quencyresponseofthesystemintheroom.

In the ideal world you’d have an equalizer

to set the system EQ curve, something to

eliminatefeedback,and somethingelseto

keepthe systemlevel under control.

So, we’d like to introduce you to the ARX

contribution to the ideal world - the ARX

AFW 30 Anti Feedback Workstation.

Asuperaccurate 30bandgraphic equaliz-

er, with 30 of our new XR Extended Res-

olution long throw faders providing up to

± 10dB of cut and boost, a fast, smooth

soundingpeaklimiter,plusonboard9band

FBXFeedbackExterminator DSPcircuitry

licensedfrom Sabine.

Thefirst 6FBX filters lockin atthe primary

feedback nodes, leaving 3 filters ‘floating’

to handle any short term feedback prob-

lems,suchas presentersorartists moving

themicrophone in frontof the speakers,or

too close to monitors, or something simi-

lar.Theseareusuallyshorttermproblems,

and once they have passed, the floating

filters go back to a waiting mode.

Operation of the AFW 30 is simplicity

itself. Just use the EQ section to set

the curve you require, press the Re-

setswitchin theantifeedback section

for4seconds,and start increasingthe

systemgain.

If the system is in a fixed installation,

simply power everything down when

you’ve finished.The AFW 30 remem-

bersyour anti-feedback settingsnext

time it is used - there’s no need to re-

set the circuit when it is turned back

on.

The AFW 30 also features a Variable

Threshold Output Limiter to ensure

freedom from System overload and

Amplifierclipping.

The ARX AFW 30 Anti Feedback

Workstation has an application for

every mode of live and installed au-

dio:Monitors, Front ofHouse, Church

installations, TV audience monitors,

Conferences.

Infact, anywherethere’sa live micro-

phone and loudspeakers, there’s a

need for the AFW 30.

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!Automatic Feed-

back control

!Genuine Sabine

FBX Feedback

Exterminator DSP

!30 band Graphic

Equalizer with

Extended Resolu-

tion long throw

faders

!Fast, smooth

Output limiter

!Intuitive, 'user

friendly' layout

!Ultra low noise

‘Constant Q’

circuitry

!Balanced Inputs

and Outputs on

XLR and Jack

connectors

!Flawless perform-

ance in any audio

environment

!Security cover

available

The Workstation shall be a single channel

unit in a steel chassis eight inches deep, two

rack units high, with a steel front panel.

The EQ section shall have 30 x 60mm (45mm

travel) centre grounding sliders on standard

ISO frequencies, from 25 Hz to 20 KHz. At

the 0 point each slider shall be grounded,

and in effect removed from the circuit.

The Anti Feedback section shall consist of

an onboard FBX Feedback Exterminator DSP

card, with Reset switch, an Amber LED to

indicate the onset of clipping, and an Active

or Bypassed switch. Additionally there shall

be a rear panel switch for changing the FBX

filter width from 1/5th to 1/10 octave.

The Limiter Threshold shall be variable by a

front panel control, from –10dB to +10dB,

with a Limit LED to indicate Limiting taking

place.

There shall be an overall Output level con-

trol, variable from oo

ooo

o to +10dB and also an

overall Active or Bypass switch on the front

panel. An LED on the front panel shall indi-

cate AC power being applied.

The unit shall have electronically Balanced in-

puts and outputs, on TRS jack and XLR type

connectors, with passive RFI filters and an In-

put impedance of 40 Kohms. The Input head-

room shall be +20dB, and the frequency re-

sponse shall be 20 Hz to 20 KHz, ±0.5dB.

TheOutputimpedanceshallbe300ohms,and

the maximum Output level +20dB (+10dB

FBX in), with a Signal to Noise ratio of better

than –93dB unweighted (-82dB with FBX in).

Total Harmonic Distortion shall be 0.004%

(0.02 FBX in) @ 0dB, 1 KHz.

AC Power shall be supplied via a removable

mains cable, connecting to an IEC connector

with an integral fuse /voltage change switch

on the rear panel.

The unit shall be the ARX AFW 30 Anti Feed-

back Workstation.

‘AFW 30’and ‘Anti-Feedback Workstation’ are Trademarks of ARX Systems. FBX Feedback Exterminator is a

Registered Trademark of Sabine, Inc, and is the brand name of its line of automatic feedback controllers.

• 30 x Extended Resolution long throw centre

groundingfadersperchannel,onstandard

ISOfrequencies

• Reset control for Feedback Exterminator

DSPcircuitry

• Clip LED indicates imminent clipping, mon-

itoredat all vitalstages through the AFW-30

• Balanced Input and Output TRS sockets. Tip

+ HOT, Ring – COLD, Sleeve GROUND

• Balanced Input and Output XLR connectors.

Pin 2 + HOT, Pin 3 – COLD, Pin 1 GROUND

• Active/Bypass switch for Feedback Extermi-

natorDSP circuitry

• Limiter Threshold control and Limit LED

• Level control from oo to +10 dB

• Hardwire Active/Bypass switch for unit

• Power LED indicates AFW-30 is connected

to AC power

• Feedback Exterminator filter width switch

• IEC 3 pin AC connector and integral

fuseholder.

Input

40K Ohm Balanced

20KOhm Unbalanced

Output

300OhmBalanced

150OhmUnbalanced

Nominal Operating Level

0dB

Maximum Input Level

+20dB

Maximum Output Level

+20 dB EQsectiononly

+10 dB FBX in

Signal to Noise Ratio

EQsectiononly

–93dBUnweighted

FBX in

–82dBUnweighted

Gain

User Variable oo to +10 dB

Distortion

0.004% EQsectiononly

0.02% FBXin

measured@1 KHz, +4dB

Frequency Response

20 Hz to 20 KHz, ±0.5 dB

Dynamic Range

+113 dBEQ section only

+92 dB FBX in

Equalizer Filters

30 x Constant Q on

standardISOfrequencies

FBX Filters

6fixed, 3 dynamic

FBX Filter Range

51Hz to 17 KHz

FBX Filter Width

1/5thor 1/10th octave

Switchable;refermanual

FBX Filter Depth

0dBto–40dB

FBX Filter Reset Time

Minimum4seconds

Peak Limiter Threshold

Variable –10 dBto +10 dB

AC requirements

100–120,220–240VAC,

50-60Hz,18 VA

Size

482 x 88 x 205 mm

19”W x 3½”H x 8”D

Our policy is one of continuous im-

provement, and therefore designs

may change without notice. Howev-

er, unless otherwise stated, specifi-

cations will always equal or exceed

those previously given.

Specifications available on CD ROM.

Latest updates available at:

www.arx.com.au

ARXSystems arebased in Melbourne, Australia, where all ARXProducts areassembled

andtested inour ‘state-of-the-art’manufacturing facility

For over 20 years ARX has designed, manufactured and supported Audio Products for

Professionalusers andapplications worldwide

ARX Systems Pty Ltd; PO Box 15, Moorabbin, Victoria 3189, Australia

Phone: 03 9555 7859 Fax: 03 9555 6747 International Fax +61 3 9555 6747

Email: [email protected] Internet: www.arx.com.au

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