Klark Teknik Square One Graphic Operator's Manual

graphic

operator

manual

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OPERATOR MANUAL

Midas Klark Teknik Limited

Klark Industrial Park

Walter Nash Road

Kidderminster

Worcestershire

DY11 7HJ

England

Tel: [phone]

Fax: [phone]

Email: [e-mail]

Website: www.ktsquareone.com

Square ONE Graphic Equaliser — Operator Manual

DOC02-SQ1GRAPHIC Issue E — April 2010

© Red Chip Company Ltd.

In line with the company’s policy of continual improvement, specifications and function may be

subject to change without notice. This Operators Manual was correct at the time of writing. E&OE.

graphic

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IMPORTANT SAFETY INSTRUCTIONS

The lightning flash with arrowhead symbol
within an equilateral triangle, is intended to
alert the user 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 to persons.

The exclamation point within an equilateral
triangle, is intended to alert the user to the
presence of important operating and
maintenance (servicing) instructions in the
literature accompanying the product.

1 Read these instructions.

2 Keep these instructions.

3 Heed all warnings.

4 Follow all instructions.

5 Do not use this apparatus near water.

6 Clean only with a dry cloth.

7 Do not block any of the ventilation openings. Install

in accordance with the manufacturer’s instructions.

8 Do not install near any heat sources such as

radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.

9 Do not defeat the safety purpose of the polarized or

grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding
type plug has two blades and a third grounding
prong. The wide blade or the third prong are
provided for your safety. If the provided plug does
not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.

10 Protect the power cord from being walked on or

pinched particularly at plugs, convenience
receptacles, and the point where they exit from the
apparatus.

11 Only use attachments/accessories specified by the

manufacturer.

12 Unplug this apparatus during lightning storms or

when unused for long periods of time.

13 Refer all servicing to qualified personnel. Servicing is

required when the apparatus has been damaged in
any way, such as power supply cord or plug is
damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate
normally, or has been dropped.

14 Use the mains plug to disconnect the apparatus from

the mains.

15 Warning: To reduce the risk of fire or electric

shock, do not expose this apparatus to rain or
moisture.

16 Do not expose this equipment to dripping or

splashing and ensure that no objects filled with
liquids, such as vases, are placed on the
equipment.

17 The mains plug of the power supply cord shall

remain readily operable.

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EC-Declaration of Conformity

The undersigned, representing the following manufacturer
Manufacturer: Address:

Midas Klark Teknik Limited Klark Industrial Park, Walter Nash Road,

Kidderminster, Worcestershire DY11 7HJ

hereby declares that the following product

is in conformity with the regulations of the following marked EC-directive(s) and bears the -mark
accordingly

The conformity of the product with EC Directives for use in environments E1, E2, E3 and E4 is provided by the compliance
with the following standards:

Standards/date

Place, date: Kidderminster, UK

15th April 2010

General Manager AVP, Product Development

Printed name: John Oakley Printed name: Alex Cooper

Product Type Number Product Description Nominal Voltage(s) Current Freq.

Square ONE Graphic Graphic Equaliser 115V AC

230V AC

314mA

155.2mA

50/60Hz

Reference Number Title

2004/108/EC EMC Directive (EMC)

2006/95/EC Low-Voltage Directive (LVD)

Reference Number Title

EN50081/1 Generic Standard Using EN55103 Limits and Methods

EN55103 Class B Conducted Emissions PAVI

EN55103 Class B Radiated Emissions PAVI

EN61000-3-3:2000 Voltage Fluctuation and Flicker

EN61000-3-2:1995 Harmonic Current Emissions

EN60065:2002 Electrical Safety

Klark Teknik

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Page i

Square ONE Graphic i

Contents

Welcome! __________________________________________ 1
Safety precautions ___________________________________ 2

Safety warnings 2
General precautions 2
Power 3
Handling the equipment 3
Installation 4
Location 4
Audio connections 4
Radio frequency interference 4

Class B device 4

Electric fields 5
Operation 5
Safety equipment 5
Optional equipment 5
Special accessories 5

Features___________________________________________ 6
Getting started______________________________________ 7

Unpacking 7
Checking the mains fuse 7
Installation 7
Connecting the power cable 7
Connecting the audio cables 8

Balanced I/O 8
Unbalanced I/O 8
Unbalanced inserts 9
Connecting to unbalanced equipment 10

Powering up the unit 10

Front panel quick reference ___________________________ 11
Rear panel quick reference ___________________________ 12
Front panel features ________________________________ 13

Signal level 13
Graphic EQ section 13
Gain control 13
Filters 14
BYPASS switch 14
POWER on/off LED 14

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ii Square ONE Graphic

Rear panel features _________________________________ 15

Mains supply 15
Audio connections 16

Audio inputs 16
Audio outputs 16

Other features _____________________________________ 16

Power-off bypass relays 16

Example of system connection_________________________ 17
Using the Square ONE Graphic_________________________ 18

Studio and creative use 18
Live use - front of house (FOH) 18
Live use - monitors 19

Equalising a system _________________________________ 20

Preparing for equalisation 20
Equalisation using an RTA 20

Effects of equalisation _______________________________ 22

Effects of equalisation on voice reproduction 22
Effects of equalisation on music reproduction 23

Audio signal path ___________________________________ 24
Proportional-Q filter response _________________________ 25
Balanced/unbalanced audio __________________________ 30
Square ONE Graphic application notes___________________ 31

Front-of-house 31
Monitors 31
High pass filter (HPF) 31
Low pass filter (LPF) 31

Technical specification_______________________________ 32
Frequency chart ____________________________________ 33
Crib sheet_________________________________________ 34
Service information _________________________________ 35

Routine maintenance 35
Cleaning the unit 35
Checking/replacing the mains fuse 35

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Welcome!

Square ONE Graphic 1

Welcome!

Thank you for purchasing a Klark Teknik Square ONE Graphic graphic equaliser.

Klark Teknik has conceived the Square ONE range to offer audio professionals a range of easily accessible,
high-performance audio equipment, designed to provide no-compromise sonic quality with a feature set
which offers all essential facilities.

Your Square ONE Graphic equaliser represents the very best of British design and engineering, combined with
contemporary, efficient manufacturing methods, and will give you many years of reliable service.

The Square ONE Graphic is a dual, 30-band, third octave graphic equaliser. It incorporates long throw
45 mm faders and has high and low pass filters on each channel.

All backed up, of course, by the standard Klark Teknik three year warranty.

Please take the time to complete and return the registration card or fill in the Warranty Registration Form
online by visiting our website at www.ktsquareone.com and, to obtain the best results with a minimum of
effort, also read this operators manual.

Finally, enjoy your Klark Teknik Square ONE Graphic!

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Safety precautions

2 Square ONE Graphic

Safety precautions

Before installing, setting up or operating this equipment please ensure that you have read and
fully understand all of this section and the “IMPORTANT SAFETY INSTRUCTIONS” at the front of
this manual.

This equipment is supplied by a mains voltage that can cause electric shock injury!

The following special limitations must be observed in order to maintain safety and electromagnetic
compatibility performance.

Safety warnings

This equipment is fitted with a 3-pin power socket. For safety reasons the earth lead must not be
disconnected.

Signal 0V is connected internally to the chassis.

To completely disconnect this equipment from the AC mains, unplug the mains lead from the
power outlet.

Do not expose this equipment to dripping or splashing and ensure that no objects filled with
liquids, such as vases, are placed on the equipment.

To prevent shock or fire hazard, do not expose the equipment to rain or moisture. To avoid
electrical shock do not remove covers. Refer servicing to qualified personnel only.

The power supplies - even the DC ones - have a high current!

General precautions

The following information gives basic safety precautions that should be observed to reduce the risk of fire,
electric shock and personal injury:

• Only properly trained service personnel familiar with this manual and with the generally applicable
safety regulations should service the equipment.

• Safety instructions detailed in the manual should be understood and properly implemented.

• In the event of ground loop problems, disconnect the signal screen at one end of the connecting
cables. Note that this can only be done when the equipment is used within a balanced system.

• Never operate damaged equipment and never operate equipment with damaged cables.

• Any part that is damaged should be properly repaired or replaced. This must be done by a fully
trained and authorised service engineer.

• Observe all warnings, cautions etc. on any part of the equipment.

• Do not remove, hide or deface any warnings or cautions.

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Safety precautions

Square ONE Graphic 3

Power

THE POWER SUPPLY SHOULD NEVER BE OPERATED WITH THE MAINS EARTH DISCONNECTED!

This unit should only be operated with the power supply connected to ground via the ground in the mains
connector.

The internal power supply is a switch mode type that automatically senses the incoming mains voltage and
will work where the nominal voltage is in the range 100-240 VAC.

A single, fused IEC mains inlet is provided on the rear panel. The correct lead for connection in the area to
which the unit was shipped is supplied with the unit. The equipment should only be plugged into the mains
outlet using the supplied lead.

Please note that the power supply contains LETHAL VOLTAGES greatly in excess of the mains voltage and that
its rails can produce extremely large currents that could burn out equipment and wiring if shorted. All testing
and servicing must ONLY be carried out by approved service engineers.

We strongly recommend that, for safety and to optimise the life and performance of the equipment, the
mains cable plug is removed from the power outlet when the equipment is not to be used for extended
periods of time or during electrical storms.

When removing the equipment’s electric plug from an outlet, always hold the plug itself and not the cable.
Pulling out the plug by the cable can damage it.

Never insert or remove an electric plug with wet hands.

Handling the equipment

Completely isolate the equipment electrically and disconnect all cables from the equipment before moving it.

When lifting or moving the equipment, take its weight into consideration.

Do not insert your fingers or hand in any gaps or openings on the equipment, for example, vents.

Avoid inserting or dropping foreign objects, such as paper, plastic, metal etc., into any gaps or openings on
the equipment, for example, vents. If this happens, turn off the power immediately and unplug the power
from the AC outlet. Then have the equipment inspected by the manufacturer's qualified service personnel.

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Safety precautions

4 Square ONE Graphic

Installation

Before installing the equipment:

• Make sure the equipment is correctly connected to the protective earth conductor of the mains voltage
supply of the system installation through the mains lead.

• Power to the equipment must be via a fused spur.

• The power plug must be inserted in a socket outlet provided with a protective earth contact. The
electrical supply at the socket outlet must provide appropriate over-current protection.

• Both the mains supply and the quality of earthing must be adequate for the equipment.

• Before connecting up the equipment, check that the mains power supply voltage rating corresponds
with the local mains power supply and that the mains fuse is of the correct type and rating.

Location

• Ideally a cool area is preferred not in close proximity to power distribution equipment or other
potential sources of interference.

• Do not install the equipment in places of poor ventilation.

• Do not install this equipment in a location subjected to excessive heat, dust or mechanical vibration.
Allow for adequate ventilation around the equipment, making sure that its fans and vents are not
obstructed. To prevent excessive heating of the equipment, avoid mounting it directly above power
amplifiers or other devices that radiate significant amounts of heat such as, radiators and heaters.
Keep the equipment out of direct sunlight. Where necessary use fan cooled racks.

• Do not place equipment in an unstable condition where it might accidentally fall over.

• Make sure that the mains voltage and fuse rating information of the equipment will be visible after
installation.

• Do not use the equipment in the vicinity of electrical devices, such as computer monitors or mobile
phones, which may generate electrical noise.

Audio connections

To ensure the correct and reliable operation of your Square ONE Graphic, only high quality balanced,
screened, twisted pair audio cable should be used.

XLR connector shells should be of metal construction so that they provide a screen when connected to the
unit and should have Pin 1 connected to the cable screen.

Radio frequency interference

Class B device

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference to

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Safety precautions

Square ONE Graphic 5

radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.

• Consult the dealer or an experienced radio TV technician for help.

Electric fields

Caution:
In accordance with Part 15 of the FCC Rules & Regulations, “… changes or modifications not
expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.”

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).

Operation

To avoid electrical shock, never operate the equipment with the covers removed.

Safety equipment

Never remove, for example, covers, housings or any other safety guards. Do not operate the equipment or
any of its parts if safety guards are ineffective or their effectiveness has been reduced.

Optional equipment

Unless advised otherwise, optional equipment must only be installed by service personnel and in accordance
with the appropriate assembly and usage regulations.

Special accessories

To comply with part 15 of the FCC Rules, any special accessories (that is, items that cannot be readily
obtained from multiple retail outlets) supplied with this equipment must be used with this equipment; do not
use any alternatives as they may not fulfil the RF requirement.

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