ARX EC-1 User manual
EC-1
Features
TheARXEC-1andEC-2arebothflex-
ible yet affordable 24 dB per octave
Phase Correct electronic crossovers.
They have 2 modes of operation; as
either Stereo 2 way or a Mono 3 way
units, with a switch on the back panel
selecting either mode.
•Tamper-ProofCrossoverPoints
The crossover points are determined
internally by the value of 4 resistors
perchannel;changingthe resistor val-
ue changes the crossover point. This
‘semi fixed’method avoids the pitfalls
ofexternally adjusted crossoverpoints,
making the crossover points tamper-
proof once they are set.
As a handy guide, a list of common
crossoverpointsandtheircorrespond-
ing resistor values are printed inside
the unit's lid, and also set out in the
Owner's Manual.
On the front panel are level controls
forLowandHigh in dual channel 2 way
mode, and Low, Mid and High in sin-
gle channel 3 way mode, with corre-
sponding Outputs on the rear panel.
• Balanced Inputs (and Outputs)
The EC-1 has electronically Balanced
Inputs, on TRS jack connectors, and
the EC-2 has Balanced Inputs
and
Outputs, on XLR connectors.
The EC-2 also has an additional
summed Mono Low output, for appli-
cations that need a Mono Low feed
(e.g. Left and Right full-range plus a
single Sub Bass speaker).
• High Pass Filter
Both models feature a preset 30 Hz
HighPass filter to remove unwanted
subsonicswhichcan damage speak-
ers and waste amplifier power.
In addition, each output has up to +6
dB of gain available, to compensate
for amplifiers and speakers of differ-
ing sensitivities.
• Universal AC Power
AC powerrangeisa universal100to
120V or 220 to 240VAC, and is con-
nected to the unit via a standard IEC
connector, withbuilt-infuseand volt-
age change switch.
•Uncompromising Audio Quality
Innovative circuit design is pointless
unless it delivers stunning sound
quality, and here the EC-1 and EC-2
excel. Both are designed for uncom-
promising audio quality, and to
achieve this, Linkwitz Riley 24dB
(Fourth Order) state variable filters
are used throughout their circuitry.
This ensures a smooth Phase Cor-
rect transition through the crossover
region.
From Stage Monitors to Studio Mon-
itors,from Front of House to theFront
room of your House, the ARX EC-1
and EC-2 are both crossovers that
are suited to any application that re-
quires flawless, transparent sound.
http://www.arx.com.au
þUltra low noise
circuitry
þTotally phase
aligned at crosso-
ver point
þSwitchable Dual
Channel 2 way or
Single Channel 3
way
þUnique 'semi-fixed'
crossover point
þ24dB per octave
(Fourth Order)
Linkwitz-Riley
filters
þSeparate Summed
Mono Output on
EC-2)
þBalanced Inputs,
(and Outputs on
EC-2)
þBuilt in High Pass
filters
þIntuitive, 'user
friendly' layout
þFlawless perform-
ance in any audio
environment
þSecurity cover
available
Stereo 2 way, Mono 3 way
24dB Electronic Crossover
ARX Systems Pty Ltd, Australia; Phone: +61-3 9555 7859 Fax: +61-3 9555 6747
FRONT PANEL
Your ARX dealer is:
EC-1,EC-2
Specifications
Input Impedance
Balanced 20 Kohms
Unbalanced10 Kohms
Input Headroom
+ 21 dB
CMRR
>45 dB, 20 Hz—20 KHz
Output Impedance
Balanced 300 ohms(EC-2)
Unbalanced150 ohms
Output Level (Max)
+ 21dB
Frequency Response
30Hz—20KHz±0.5dB
Note: 30 Hz is a function
of the High Pass filter
Signal to Noise ratio
(Controls at Unity)
-90 dB Unweighted
-93 dB ‘A’ weighted
Distortion
.004% THD,0dB,1KHz
Dynamic Range
111 dB
Power Requirements
100/120 V AC
220/240 V AC
Weight
5 lbs/2.2 Kg
Dimensions
19"W x 13/4"H x 6"D
482 x 44 x 155mm
Input Connector type
XLR, Balanced Jack
Output Connector type
XLR, Balanced Jack
Sidechain Insert Connector
TRS Jack
Crossoverpoint frequencies are
changedinternallyby varying
the value of 4 resistors per
channel.Full details are in the
Service Notes section of the
Owner's Manual, and are also
printedinside the lid.
©1997 ARX Systems Pty.Ltd. ACN 006 471 825. All rights reserved. ARX Systems® is a Registered Trade Mark.
Specificationsavailableondisk <
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.
http://www.arx.com.au
EC-1
• Balanced TRS Jack Inputs
• 2 way/ 3 way mode switch
• Low and High Output controls for 2 way mode
• Low , Mid and High Output controls for 3 way
mode
The crossover shall be a dual channel 2 way or sin-
gle channel 3 way unit in a steel chassis six inches
deep and one rack unit high. There shall be a rear
panel switch to put the unit into either mode. The
crossover shall have true Linkwitz Riley 24 dB per
octave, phase corrected state variable filters.
The front panel shall feature controls for Low and
High frequencies in dual channel mode, and Low,
Mid and High frequencies in single channel mode.
There shall be corresponding outputs on the rear
panel,plusaseparatemonolowfrequencysummed
output (EC-2). Each output will have up to +6dB of
gain available, to compensate for amplifiers and
speakersofdifferingsensitivities.Thereshallalsobe
a preset 30 Hz High Pass filter to remove unwanted
subsonics.
(EC-2)The unit shall have electronically Balanced
inputs, on TipRingSleeve (TRS) jack connectors (Tip
+,Ring -, Sleeve Ground),andXLRconnectors,with
passive RFI filters and an Input impedance of 20
Kohms (10 Kohms unbalanced). The Outputs shall
also be Balanced, on XLR connectors, with an output
impedance of 300 ohms balanced (150 ohms unbal-
anced),
(EC-1)The unit shall have electronically Balanced in-
puts, on TipRingSleeve (TRS) jack connectors (Tip +,
Ring -, Sleeve Ground).
The Input headroom shall be +21dB, with a CMRR of
better than 50dB, and the frequency response shall be
30 Hz, -0.5dB (as a function of the High Pass filter) to
20KHz,+0.16dB,andthe maximumOutputlevelshall
be +21dB, with a Signal to Noise ratio of -93dB A
weighted (-90dB unweighted).
Total Harmonic Distortion shall be .004% @ 0dB, 1
KHz,and theunitshallhave a dynamicrangeof111dB.
AC Power shall be supplied via a removable mains ca-
ble, connecting to an IEC connector with an integral
fuseand voltage change switchon the units rear pan-
el.
The crossover shall be the ARX EC-1
REAR PANEL
ARCHITECTS AND
ENGINEERS SPECIFICA TIONS
• Markerpanels for labelling crossover assigns
• 2 way/3 way status LEDs (EC-2)
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