ARX EQ series User manual

Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX® Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX®8 1
GRAPHIC
EQUALIZER
OWNER’S
MANUAL
ARX Systems Pty Ltd, PO Box 15,
Cheltenham, Victoria 3192, Australia
Phone: 03 - 9555 7859 Fax: 03 - 9555 6747
International Fax: [phone]
On the Web: http://www.arx.com.au
Email: [email protected]
INTERNATIONAL LIMITED WARRANTY
ARX Systems (ARX) warrants to the first purchaser of any ARX equipment that it is
freefromdefectsinmaterialsandworkmanshipundernormaluseandservice.ARX’s
sole obligation under this warranty shall be to provide, without charge, parts and
labour necessary to remedy defects, if any, which appear within twelve (12) months
from date of purchase, and for a further twelve (12) months supply parts only.
This is our only warranty. It does not cover finish or appearance items, or if the
equipment has been, in ARX’s sole judgement:
•Subjected to misuse, abuse, negligence or accident;
•Repaired, worked on, or altered by persons not authorized by ARX;
•Connected, installed, adjusted or used for a purpose other than that for which
it was designed.
This warranty gives you and us specific legal rights and you may also have other
rights which may apply.
Warranty Service Procedure
Should it become necessary to have your equipment serviced under the
terms of the warranty, please follow these steps:
1. Call your ARX distributor for a Return Authorization (RA)
number;
2. Carefully repack the unit, in its original packaging where possible,
including a note with a description of the problem, and a copy of
the receipt showing date of purchase. Attach these to the actual
unit itself. Don’t forget to write your name and address clearly,
and include a phone number where you can be contacted during
normal business hours. Make it easy for our service technicians to
contact you if they have a question. Also, use plenty of packing
material - better to be safe than sorry.
3. Send the unit freight prepaid to ARX Systems, at the address
given you with your RA number. We will pay the return freight
when the serviced unit is returned to you.
4. We strongly recommend you insure the package. We can’t fix it if
it gets lost! Send it by UPS, Fedex, or any similar service that can
track the package. Parcel Post is not recommended
If Warranty Registration Card is missing, please write to ARX in the country of
purchase, stating model and where purchased, or to ARX, PO Box 15,
Cheltenham, Victoria 3192, Australia.
Or you can Email us at: [email protected]

Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX® Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX®
27
EQ15 Specifications
Input Impedance Balanced 20 K ohms
Unbalanced 10 K ohms
Input Headroom + 23 dB
CMRR >52 dB, 20 Hz to 20KHz
Output Impedance Balanced 300 ohms
Unbalanced 150 ohms
Output Level (Max) + 23 dB
Filter Two thirds octave, 15 x ISO standard
frequencies per channel
Filter Type R/C active, MFB bandpass, Constant Q
Centre Frequency accuracy ±2% of nominal
Maximum Cut/Boost ±15 or 6 dB, switchable
Frequency Response 10 Hz to 20 KHz, ±.25 dB
Signal to Noise ratio -93 dB Unweighted
-98 dB ‘A’ weighted
(All controls centred)
High Pass Filter -3dB @ 30 Hz, switchable
Distortion .0035% THD @ 0dB,1KHz
Dynamic Range 116 dB
Power Requirements 100/120 V AC 50 - 60 Hz
220/240 V AC 50 - 60 Hz
20 Watts (20 VA)
Weight 8 lbs/3.75 Kg
Dimensions 19"W x 3½"H x 9"D
482 x 89 x 230mm
Input Connector type Jack and XLR
Output Connector type Jack and XLR
This symbol indicates that a Slow Blow fuse is used in this
equipment. Replace with same type and value only
This symbol is intended to alert you to the presence of uninsulated
dangerous voltage within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric shock.
This symbol is intended to alert you to the presence of important
operating instructions contained in this owner's manual
WARNING SYMBOLS USED ON THIS EQUIPMENT
IMPORTANT - PLEASE READ THIS FIRST
This is a dual voltage unit. It is essential that you check that the voltage
on the fuseholder cover below the AC connector on the rear of the chassis
is set correctly before connecting it to AC power.
To change, pull fuseholder out and rotate 180o, then push in again. Do not
insert power cable into unit until voltage has been correctly set. Do not
plug power cable into AC power until voltage has been correctly set
THIS IS SET FOR
100 V AC TO 120 V
AC OPERATION
THIS IS SET FOR
220 V AC TO 240 V
AC OPERATION
Complieswith89/336/EECElectromagnetic
CompatibilityDirective,amendedby92/31/
EECand 93/68/EECand meetsthe follow-
ing standards:EN 55013 : 1990, Sections
3.2and3.5EN55020:1988,Sections4.3,
5.4, 6.2, 7.0, 8.0.

Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX® Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX®4 5
Rear Panel Connectors
• Balanced Input TRS socket Channel A.
Tip HOT, Ring COLD,-Sleeve GROUND
• Balanced Input XLR type Channel A.
Pin 2 HOT, Pin 3 COLD, Pin 1 GROUND
• Balanced Output XLR type Channel A
(same wiring as Input)
• Balanced Output TRS socket Channel A
(same wiring as Input)
• Audio Ground Lift switch
Channel B connectors identical to Channel A
• IEC 3 pin AC connector and integral
fuseholder. Replace fuse with correct
value only: 100 - 120 V AC 1 amp, 220-240
V AC 0.5 amp. Please also refer to voltage
details on Page 2
Front Panel Controls
1. 15 or 30 maximum throw, well
damped, centre grounding sliders per
channel, on standard ISO frequencies
2. Clip LED indicates onset of clipping,
monitored at all vital stages throughout
the EQ circuitry
3. Input Gain control, from infinity
through 0dB to +6dB
4. 15 dB/6 dB EQ range switch
5. 30 Hz High Pass Filter IN/OUT switch
6. Equalizer IN/OUT switch
7. Power LED indicates Equalizer is
connected to AC power

Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX® Graphic Equalizer Owner's Manual v 2.3CE ©1997 ARX®6 3
EQ60 Specifications
Input Impedance Balanced 20 K ohms
Unbalanced 10 K ohms
Input Headroom + 23 dB
CMRR >52 dB, 20 Hz to 20KHz
Output Impedance Balanced 300 ohms
Unbalanced 150 ohms
Output Level (Max) + 23 dB
Filter One third octave, 30 x ISO standard
frequencies per channel
Filter Type R/C active, MFB bandpass, Constant Q
Centre Frequency accuracy ±2% of nominal
Maximum Cut/Boost ±15 or 6 dB, switchable
Frequency Response 10 Hz to 20 KHz, ± .25 dB
Signal to Noise ratio -93 dB Unweighted
-98 dB ‘A’ weighted
(All controls centred)
High Pass Filter -3dB @ 30 Hz, switchable
Distortion .0035% THD @ 0dB,1KHz
Dynamic Range 116 dB
Power Requirements 100/120 V AC 50 - 60 Hz
220/240 V AC 50 - 60 Hz
20 Watts (20 VA)
Weight 10 lbs/4.5 Kg
Dimensions 19"W x 5¼"H x 9"D
482 x 132 x 230mm
Input Connector type TRS Jack and XLR
Output Connector type TRS Jack and XLR
EQ30 specifications electronically identical except that it’s a single channel unit
Introduction
Thank you for choosing this ARX Graphic Equalizer. We hope you enjoy
using it as much as we enjoyed creating it. As with all ARX equipment, it
has undergone extensive factory calibration and ‘burn in’ before shipping.
To ensure continued trouble free use, please familiarise yourself with the
contents of this manual before using.
About ARX Graphic Equalizers
ARX graphic equalizers are designed to give flawless performance, yet
take up the minimal rack space commensurate with total operator control.
The EQ30 and EQ60 are uncompromisingly professional third octave
equalizers that are equally at home with applications ranging from
Compact Disc mastering and Broadcasting to high level Studio room
tuning and Concert Sound. The EQ15 is targeted at installations where the
program material is predominantly pre-recorded and pre-processed, such
as Disco and Karaoke, or where budget constraints preclude the use of a
dual 30 band equalizer.
Rigorous analysis and testing of equalizer requirements, and the
limitations of existing designs, has led ARX design engineers to develop
and refine the innovative ‘Constant Q’ circuitry featured in these
equalizers. Constant Q is a true WYSIWYG (What You See Is What You Get)
design concept that allows far more accuracy in EQ control.
Each channel has a Gain recovery control with up to 6 dB of gain; a Clip
LED to indicate circuit overload; 30 or 15 maximum throw, well damped,
centre grounding sliders, switchable to either +/-15 dB, or +/-6 dB for
accurate fine tuning. As well there is a switchable 30 Hz High Pass filter,
and an IN/OUT hardwire bypass switch which removes the EQ
completely from the circuitry.
Other features include true differential balanced Inputs and servo balanced
Outputs on both XLR and TRS connectors, plus an audio ground lift
switch.
With their compact High Density design, cool good looks, and precision
electronics, ARX Graphic Equalizers provide attractive solutions for all
equalization applications.