Klark Teknik Square One Graphic User 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: [email protected]
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
2Square 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
4Square 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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Features
6Square ONE Graphic
Features
The Square ONE Graphic 1/3 octave, analogue equaliser performs graphic equalisation and filtering, and has
the following features:
• Two channels.
• 30 bands of proportional-Q equalisation per channel via long throw, 45 mm faders.
• Electrically balanced input and output per channel via female and male XLR connectors, respectively.
• 1/4” TRS-balanced jack socket for each input and output.
• Level metering per channel is provided by SIGNAL and CLIP LEDs.
• Gain control per channel for continuous adjustment of channel gain.
• Fixed 80Hz high pass filter per channel.
• Fixed 12kHz low pass filter per channel.
• Input gain, filters and graphic equalisation on each channel can be bypassed.
• Power-off bypass relays to avoid audible thumps when unit is switched off or if a power rail fails.
• Pushbutton switch operation for high and low pass filters and bypass.
• LEDs for power, high and low pass filters, and bypass that provide on/off status indication.
• Mains supplied via an IEC socket on rear panel.
• Fuse drawer contains easily replaceable mains fuse with a compartment for a spare.
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Getting started
Square ONE Graphic 7
Getting started
Observing the guidelines in “Safety precautions” on page 2, carry out the following to get your Square ONE
Graphic unit fully operational.
Unpacking
Carefully unpack your Square ONE Graphic equipment package.
Then please inspect the Square ONE Graphic unit carefully for any signs of damage that may have occurred
during transit and notify the courier immediately if you discover any.
Check the contents of your Square ONE Graphic equipment package. If there are any parts missing,
incorrect or faulty, please contact your local distributor or Klark Teknik at the address at the front of this
manual.
Please retain the original packing in case you should need to return the equipment to the manufacturer or
supplier, or transport or ship the unit later.
Checking the mains fuse
Before installing the equipment you need to make sure that the mains fuse fitted is of the correct type and
rating for your unit. To do this follow the instructions in “Checking/replacing the mains fuse” on page 35.
Installation
This unit is designed for mounting in any 19” EIA standard rack. Four rack-mount holes in the front panel are
provided for rack mounting and are designed to fully support the weight of the unit in the rack.
The position of the unit will depend upon how it is to be used. However, when positioning the unit, avoid
placing it where the faders may be damaged by being accidentally knocked or snapped off. Also, try to avoid
placing the unit directly near or on any power distribution units or power amplifiers.
Connecting the power cable
Making sure that the mains power at the power outlet is off, connect the mains cable supplied with your
Square ONE Graphic to the mains power outlet and then to the mains socket at the rear of your unit.
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Getting started
8Square ONE Graphic
Connecting the audio cables
This section gives the connection details for balanced/unbalanced I/O and unbalanced inserts. For more
details on balancing, see “Balanced/unbalanced audio” on page 30.
Balanced I/O
For balanced I/O, connect the audio cables as shown below.
Unbalanced I/O
For unbalanced I/O, connect the audio cables as shown below.
1
3
2
12
3
Pin 2: Hot signal
Pin 3: Cold signal
Pin 1:
Screen/Ground
Female XLRMale XLR
Pin 1:
Screen/Ground
Pin 2: Hot signal
Pin 3: Cold signal
1
3
2
12
3
Pin 2: Hot signal
Pin 3: Ground at
unbalanced end
Pin 1:
Screen/Ground
(not connected at
unbalanced end)
Pin 1:
Screen/Ground
(not connected at
unbalanced end)
Pin 2: Hot signal
Pin 3: Ground at
unbalanced end
Female XLRMale XLR
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Getting started
Square ONE Graphic 9
Unbalanced inserts
For unbalanced inserts, connect the audio cables as shown in Figure 2, below. Figure 1 shows the
construction of a 1/4” TRS connector.
Figure 1: Insert send/return 1/4” TRS connector details
Figure 2: Insert send/return 1/4” TRS connectors - wiring details
Note: Connect insert send with input and insert return with output of effects device.
Sleeve: ground/shield
Tip: send (out)
Ring: return (in)
Strain relief
clamp
Tip (send)
Sleeve (ground/shield)
Tip
Ring
Sleeve Tip (return)
Sleeve (ground/shield)
Tip
Tip
Sleeve
Sleeve
Tip
Sleeve
Ring
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Getting started
10 Square ONE Graphic
Connecting to unbalanced equipment
Ideally, you will be making the best use of the Square ONE Graphic’s low-noise high-headroom balanced
inputs by connecting to similarly balanced equipment. However, if you do have to connect to unbalanced
devices, the following wiring is recommended for best results (see Figure 3):
• Connect the +ve (pin 2) of the balanced connection to the +ve terminal on the unbalanced connector.
• Connect the -ve (pin 3) of the balanced connection to the common (ground) terminal on the
unbalanced connector.
• Connect the ground (pin 1) of the balanced connection, to the common (ground) terminal on the
unbalanced connector.
Figure 3: Insert send/return 1/4” TRS connector/XLRs - wiring details
Powering up the unit
To power up the unit, switch on the power at the mains power outlet. The POWER LED on the front of the
unit will illuminate to indicate that power is on.
Your unit is now ready to operate.
Tip
Ring
Sleeve
Male XLR
Tip
Sleeve
Ring
Female
12
3
1
2
3Female XLR
Male XLR
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