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DN360
OPERATORS MANUAL
Klark Teknik Group,
Klark Teknik Building,
Walter Nash Road,
Kidderminster.
Worcestershire.
DY11 7HJ.
England.
Tel:+44 1562 741515
Fax:+44 1562 745371
Email: [email protected]
Website: www.klarkteknik.com
Walter Nash Road, Kidderminster, Worcestershire. DY11 7HJ. England
Tel: (44) (0) 1562 741515. Fax: (44) (0) 1562 745371
Company Registration No: 2414018
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SI GN A L P R O CE SSI N G BY D E FI N I T I ON BETTER BY DESIGN DESIGNED FOR APURE PERFORMANCE
DECLARATION OF CONFORMITY
We, Klark Teknik Group (UK) Plc
of, Klark Teknik Building, Walter Nash Road, Kidderminster, Worcestershire, DY11 7HJ
Declare that a sample of the following product:-
Product Type Number Product Description Nominal Voltage (s) Current Freq
DN360 Graphic Equaliser 115V AC 60mA 50/60Hz
230V AC 120mA
to which this declaration refers, is in conformity with the following directives and/or standards:-
Directive(s) Test Standard(s)
UL 813
CSA 22.2 No1 M90
Low voltage Directive 73/23/EEC EN 60065
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EN 50081-1 : 1992
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EN 55022 Class B
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EN 50082-1 : 1994
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC ENV 50140/ 8-93
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC ENV 50140/ 2-95
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EN 5014 1 : 1993
EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EN 60801-2 : 1993
IEC 801-4/88
Signed:............................ Date: 27th August, 1999
Name: F. D. Merrey Jnr
Authority: Managing Director, Klark Teknik Group (UK) Plc
Attention!
Where applicable, the attention of the specifier, purchaser, installer or user is drawn to special limitations of use
which must be observed when these products are taken into service to maintain compliance with the above
directives. Details of these special measures and limitations to use are available on request and are available
in product manuals.
A Subsidiary of Telex communications, Inc.
THANK YOU FOR USING THIS KLARK TEKNIK PRODUCT
To obtain maximum performance from this precision electronic product, please study these instructions carefully.
Installation and operating the equaliser is not complicated, but the flexibility provided by its operating features
merits familiarisation with its controls and connections. This unit has been prepared to comply with the power
supply requirements that exist in your location.
Precautions
Before connecting the unit to the mains power, ensure that the operating voltage is correct for your local supply.
It is important that you observe the following instructions if another voltage setting is required.
Do not install this unit in a location subjected to excessive heat, dust or mechanical vibrations.
Voltage Selection and Power Connection
Connection is made by means of an IEC standard power socket. The rear panel voltage label, indicates the
voltage required for satisfactory operation of the unit.
Before connecting this unit to the mains supply, ensure the fuse fitted is the correct type and rating is as
indicated on the rear panel, adjacent to the fuse holder.
*Mains voltage change should be carried out by a qualified service technician only.
Safety Warning
This unit is fitted with 3-pin power socket: For safety reasons the earth lead should not be disconnected.
Signal 0V is referenced internally to chassis via a resistor capacitor network which provides earth loop immunity.
To prevent shock or fire hazard, do not expose the unit to rain or moisture. To avoid electrical shock do not
remove covers. Refer servicing to qualified personnel only.
Attention!
Cables:
This product should only be used with high quality, screened twisted pair audio cables, terminated with metal
bodied 3-pin XLR connectors. The cable should be connected to pin 1. Any other cable type or configuration
for the audio signals may result in degraded performance due to electromagnetic interference.
Electric Fields:
Should this product be used in an electromagnetic field that is amplitude modulated by an audio frequency
signal (20Hz to 20kHz), the signal to noise ratio may be degraded. Degradation of up to 60dB at a frequency
corresponding to the modulation signal may be experienced under extreme conditions (3V/m, 90% modulation).
AFTER YOU HAVE UNPACKED THE UNIT
Save all the packing materials - they will prove valuable should it become necessary to transport or ship this
product.
Please inspect this unit carefully for any signs of damage incurred during transportation. It has undergone
stringent quality control inspection and tests prior to packing and left the factory in perfect condition.
If, however, the unit shows any signs of damage, notify the transportation company without delay. Only you,
the consignee, may institute a claim against the carrier for damage during transportation.
If necessary, contact your supplier or as a last resort, your Klark Teknik importing agent, who will fully
co-operate under such circumstances.
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Introduction
The graphic equaliser is a vital component in any audio system. The entire signal passes through it and so any
limitations imposed by the equaliser will compromise the performance of the whole system. For example, an
indifferently designed equaliser may introduce severe phase distortion, noise and other anomalies related to
centre frequency accuracy, filter shape and attenuation accuracy which may manifest themselves as an overall
deterioration in the perceived sound quality of the system. Clearly, this is an unacceptable state of affairs, but
fortunately your choice to utilise a Klark Teknik graphic equaliser will eliminate these problems, offering you
unprecedented product performance coupled with the highest filter calibration and reliability standards in
the industry.
For many years Klark Teknik has been at the forefront of equaliser design, and have carried our detailed research
into optimum filter response characteristics, including their sonic performance.
The Series 300 range of equalisers is a direct result of this research. It should be noted that graphic equalisation
cannot always overcome all frequency response related problems. There are applications where the ability to cut
and boost the response at a particular frequency, or over a certain bandwidth other than the equaliser specified
one, is required to overcome exceptionally difficult response anomalies or narrow band feedback problems.
When such an instance is encountered, it may be more appropriate to use the greater range of control provided
by a parametic type equaliser, where the centre frequency, bandwidth and amplitude are all controllable.
Reliability is also of paramount importance which is why our filters are designed around a technique commonly
used in computer manufacturing - thick film engineering. This technique has enabled Klark Teknik to build these
new filter circuits into self-contained packages which are referred to as "MELT". These micro-electronic
circuits are so consistent and reliable that we are able to warrant those solid state devices for 5 years. This
type of "fit and forget" technology, already proven all over the world, provides users with products that perform
brilliantly year after year.
When using an equaliser remember that the need to use large amounts of booth or that within the equalisation
curve indicates that there may be something fundamentally wrong with the sound system or room acoustics,
which should be further investigated and corrected before final equalisation is applied.
1
DN360 Graphic Equaliser
The Klark Teknik DN360 is a dual channel, 30 band equaliser offering 12dB of cut or boost in 1/3 octave steps
between the frequencies of 25Hz and 20 kHz.
Filter Shape and Combining Action
ISO CENTRE FREQUENCIES (in Hz)
20 31 50 80 125 200 315 500 800 1.25K 2K 3.15K 5K 8K 12.5K 20K
25 40 63 100 160 250 400 630 1K 1.6K 2.5K 4K 6.3K 10K 16K
5dB
1/3 Octave Band Equaliser Filter Curves
At the heart of any graphic equaliser is the bank of filters used to shape the signal response, and Klark Teknik
utilise a proprietary filter circuit which replaces the conventional inductor based circuit, at the same time,
offering several performance advantages. Inductor based circuits are heavy, expensive to produce and suffer
from low frequency distortion and induced hum. Klark Teknik's proprietary filters on the contrary suffer none
of these problems, yet offer unequaled phase response and control accuracy with the additional benefits of low
noise and minimal ripple.
Single Filter Response Curves (1/3 Octave)
2
The nature, shape and way in which individual equaliser filters combine, has a profound effect on the control
provided by the equaliser and on the resulting quality of sound. The majority of applications within the sound
reinforcement, broadcast and recording fields, require a smooth and continuous equalisation response curve in
order to correctly contour the overall response characteristics of a sound system, loudspeaker, recording effect
or audio channel. To achieve this, the individual filters must be capable of combining smoothly together to
result in a continuous response curve, free from shape discontinuities in orders to avoid unwanted audible peaks
or anomalies in the final sound.
In order to offer operational flexibility a variable fader resolution has been
incorporated i.e. 6 or 12 dB cut or boost. This function ("scale") is combined
with the bypass switch, which silently removes the graphic equaliser section from
the signal path. A subsonic 18dB/octave roll off filter (-3dB @ 3Hz) can be
switched in or out from each of the channels.
5dB
Set of Response Curves for 1/3 Octave Equaliser Filter
Other Features
Other features include an overload LED per channel, which warns of impending overload at any point in the
equaliser. A signal-ground lift switch and an optional security cover to prevent unauthorised personnel from
tampering with the control settings.
This product is built to the same high electrical and mechanical standards as all Klark Teknik equipment and is
both robust and stylish. It occupies a standard three units of rack space and has transformer balanced inputs
and outputs.
Reliability Control
Even the advanced technology incorporated in this product, each instrument is given the full backing of
Klark Teknik's "reliability control" which proves each product against a specification consistent with the
highest professional standards. Only top quality components are used, and every unit is bench tested and aligned
before a burn-in period and final performance test.
Options
Aluminium security cover Part number: SCA360
Perspex security cover Part number: SCP360
3
Instrument Familiarisation
Front Panel Functions
The scale switch selects maximum boost and cut
for the equaliser of either 6dB or12dB. The centre
position of this switch performs the bypass function,
The high quality faders used in this equaliser have an which silently removes the graphic equaliser section
oil-damped action for smooth operation and feature a from the signal path.
centre detent following accurate "flat" setting.
The power switch is a two pole type,
isolating both the live and neutral
conductors. When the power is on,
a red status LED lights.
The input level control allows
the system gain to be up to+6dB
when in its fully clockwise position,
and offers full attenuation in
its anti-clockwise position.
The Overload LED The signal level is monitored at several Low cut filter switch enables a 30Hz subsonic
separate points within the circuitry of the unit, and any one of these filter to be connected in or out of circuit.
signals exceeding a threshold, set 3dB below clipping, will cause the
LED to light. This threshold is set at +19dB, but it must be remembered
that excessive boost of some frequencies combined with a high average
input signal, can occasionally cause this level to be exceeded. In this
event, the input level control should be turned down to correct the problems.
However, if the input signal itself exceeds +19dBu the input stage will be
overloaded. If this problem arises, the signal level from the output of the
preceding piece of equipment must be turned down.
Rear Panel Functions
The mains fuse is located in a fuse holder, fitted to the rear panel.
Always replace with the correct type and rating of fuse, as Input and output connections are made
indicated adjacent to the fuse holder. via complementary XLR style sockets.
Main is supplied via an IEC
standard 3 pin connector. A
compatible power cable The serial number of this unit should be
is supplied with the unit. quoted in any correspondence concerning
the unit.
4
Specifications
Input
Type Transformer balanced
Impedance (
alanced 20k
Unbalanced 10k
Output
Type Transformer balanced
Min. Load impedence 600
Source impedance
Max. Level dBu
Performance
Frequency response