ARX AFW-1 User manual

AFW-1
Anti-Feedback
Workstationtm
Features
þAutomatic Feed-
back control
þGenuine FBX
Feedback Exter-
minator
þ30 band Graphic
Equalizer
þFast, smooth
Output limiter
þIntuitive, 'user
friendly' layout
þUltra low noise
‘Constant Q’
circuitry
þBalanced Inputs
and Outputs on
XLR and Jack
connectors
þAudio Ground lift
switch on rear
þFlawless perform-
ance in any audio
environment
þSecurity cover
available
Equalizer, Peak Limiter, FBX Feedback Suppression
http://www.arx.com.au
Tuningalivesoundsystem,whetherit’s
a concert or a conference or all points
in between, is a complex procedure at
thebestoftimes!Simplystoppingfeed-
back is only a part of it - you still need
to adjust the actual sound of the sys-
tem in the room.
In the ideal world you’d have an equal-
izertosetthesystemcurve, something
to eliminate feedback, and something
else to keep the system level under
control.
So, we’d like to introduce you to the
ARX contribution to the ideal world -
the all-new ARX AFW-1 Anti Feed-
back Workstation.
A super accurate 30 band graphic
equalizer, with up to ± 10dB of cut and
boost, a fast, smooth sounding peak
limiter, plus onboard genuine FBX
Feedback Exterminator circuitry.?
Want total control over everything?
You’ve got it.
Want automatic feedback locating
and suppressing?You’ve got that too.
Want a safety valve that’ll keep your
system in one piece?You’ve got that
as well. All integrated into one 2 RU
package, all designed to work with
each other, and with you.
Operation of the AFW-1 is simplicity
itself. Just use the EQ section to set
thecurveyourequire,presstheswitch
in the anti feedback section for 4 sec-
onds, and start pushing up the level.
That’s all there is to it. When you’re
happy with the way things sound, set
the limiterThreshold at the appropri-
ate level, and start mixing.
If the system is in a fixed installation,
simply power everything down when
you’ve finished.The AFW-1 remem-
bers your anti-feedback settings next
time it is used - there’s no need to
resetthe circuit when it is turned back
on.And if you forget the instructions,
we’ve printed them on the lid for you!
The ARX AFW-1 Anti Feedback
Workstation has an application for
every mode of live audio: Monitors,
Front of House, Church installations,
TV audience monitors, Conferences;
in fact, anywhere there’s a live micro-
phone, there’s a need for theAFW-1.

ARX Systems Pty Ltd, Australia; Phone: [phone] Fax: [phone]
Front Panel
The Workstation shall be a single channel unit in
a steel chassis nine inches deep and tworack units
high, with an extruded aluminium front panel.
The EQ section shall have 30 smooth, well
damped 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 re-
moved from the circuit.
The Anti Feedback section shall consist of an
onboard FBX Feedback Exterminator card, with
Reset switch, an Amber LED to indicate the on-
set of clipping, and an Active or Bypassed switch.
Additionally there shall be a rear panel switch for
changing the FBX filter width.
The Limiter Threshold shall be variable by a front
panel control, from 10dB to +10dB, with a Red
Limit LED to indicate Limiting taking place.
There shall be an overall Output level control, vari-
able from 25dB to +6dB and also an overall Ac-
tive or Bypass switch on the front panel. An LED
on the front panel shall indicate AC power being
applied. On the rear panel there shall also be an
audio ground lift switch.
The unit shall have electronically Balanced inputs
and outputs, on TRS jack and XLR type connec-
tors, with passive RFI filters and an Input imped-
ance of 40 Kohms. The Input headroom shall be
+20dB, and the frequency response shall be 20
Hz to 20 KHz, ±0.5dB.
The Output impedance shall be 300 ohms, and
the maximum Output level +20dB (+10dB FBX
in), with a Signal to Noise ratio of better than 
98dB unweighted (-86dB 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 in-
tegral fuse /voltage change switch on the rear
panel.
The unit shall be the ARX AFW-1 Anti Feedback
Workstation. <
Specifications available on disk
©1997 ARX Systems Pty.Ltd. ACN 006 471 825. All rights reserved. ARX Systems® is a Registered Trade Mark. AFW-1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.
Your ARX dealer is:
Rear Panel
 30 smooth, centre grounding sliders per
channel, on standard ISO frequencies
 Reset control for Feedback Exterminator
circuitry
 Clip LED indicates imminent clipping, mon-
itored at all vital stages through the AFW-1
 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-
nator, Limiter and Output level controls
 Limiter Threshold and Limit LED
 Hardwire Active/Bypass switch for unit
 Power LED indicates AFW-1 is connected to
AC power
 Feedback Exterminator filter width switch
 Audio Ground Lift switch
 IEC 3 pin AC connector and integral
fuseholder.
Our policy is one of continuous improvement,
and therefore designs may change without
notice. However, unless otherwise stated, spec-
ifications will always equal or exceed those
previously given.
www.arx.com.au
AFW-1
Specifications
Input
40 K Ohm Balanced
20 K Ohm Unbalanced
Output
300 Ohm Balanced
150 Ohm Unbalanced
Nominal Operating Level
0 dB
Maximum Input Level
+20 dB
Maximum Output Level
+20 dB EQ section only
+10 dB FBX in
Signal to Noise Ratio
86 dB A Weighted
EQ section only
98 dB Unweighted
Distortion
0.004% EQ section only
0.02% FBX in
measured@ 1 KHz, +4dB
Frequency Response
20 Hz to 20 KHz, ±0.5 dB
Equalizer Filters
30 x Constant Q on
standard ISO frequencies
FBX Filters
6 fixed, 3 dynamic
FBX Clip Indicator
Amber LED
FBX Filter Range
51Hz to 17 KHz
FBX Filter Width
1/5th or 1/10th octave
Switchable; refer manual
FBX Filter Depth
0dB to 40dB
FBX Filter Reset Time
4 seconds
Peak Limiter Threshold
Variable 10 dB to +10 dB
Limiter Status Metering
Red LED: Limiter Active
AC requirements
100120, 220240 VAC,
50-60Hz, 18 VA
Size
482 x 88 x 230 mm
19W x 3½H x 9D
Architects and
Engineers Specifications