K-array tornado kt20ma User manual

REV. A ENGLISH
Self-powered 2" point source compact speaker

CONTENTS
K
array
1. Introduction p. 5
2. Unpacking p. 5
3. Symbols p. 6
4. Safety p. 7
5. Warranty p. 8
6. Key Features and Applications p. 8
7. Amplifier p. 9
8.
9. Power Cable lengths and gauge p. 11
10.Power Supply
11.Installation p. 13
12.Service p. 14
13.Specifications p. 15
Wiring and connectors p. 10
p. 12
3

Congratulations on your purchase of the
K-Array speaker system. The KT20ma is a
pioneering active micro loudspeaker
designed for point source applications and
high quality distributed systems.
Truly groundbreaking, the KT20ma can
deliver an incredible maximum peak of
107dB from it's integrated amplifier and all
from a unit that fits in the palm of your hand.
The elegant but rugged enclosure is built to
aircraft specifications from a single piece
of aluminum and measures a mere 6.4cm
(dia) x 9.3cm (deep)
The KT20ma has flexible and easy-to-
configure mounting options.
With its ability to effortlessly reproduce
both speech and music, it makes an
excellent choice for fixed applications
such as theatre, museum displays,
restaurants, portable systems for
corporate AV presentations, department
stores, and in hidden locations such as
chancel steps in houses of worship; the
applications are endless. The KT20ma has
a proprietary 2” high efficiency drive unit
with a neodymium magnet structure and a
suspension engineered for maximum
linear excursion and minimum residual
transducer interference. This cone
transducer delivers an impressive
maximum peak SPL of 107dB, and has a
Each K-array loudspeaker is built to the
h i g h e s t s t a n d a r d a n d t h o r o u g h l y
inspected before leaving the factory.
Carefully inspect the shipping carton,
then exa mine a nd tes t your n ew
loudspeaker. If you find any damage
immediately notify the shipping company.
Only the consignee may institute a claim
for damages incurred in shipping. It is
suggested that you retain the original
packaging so that the system can be
repacked at a future date if necessary.
Please note that K-array and its
d i s t r i b u t o r s c a n n o t a c c e p t a n y
responsibility for damage to any returned
product through the use of non-approved
packaging.
2. UNPACKING
1. INTRODUCTION
Self-powered 2" point source compact speaker
wide operating frequency range from 150
Hz to 18 kHz with very low distortion.
KT20ma has a 4-pin Phoenix connector
that supplies the power and balanced
audio input, making set up or fixed
installation a breeze.
All the components are designed in-house
at our Florence based R&D department.
They are custom manufactured to our
exacting standards and quality control.
5

3. SYMBOLS
This symbol, wherever it appears, alerts
y o u t o i m p o r t a n t o p e r a t i n g a n d
m a i n t e n a n c e i n s t r u c t i o n s i n t h e
accompanying literature. Read the
manual!
Collect electronic and electrical
devices separately and dispose
of according to recommended
recycling and the WEEE safe
disposal practices.
This symbol alerts the
user to the presence of
r e c o m m e n d a t i o n s
about product use and
maintenance.
This device complies with the
Restriction of Hazardous Substances
Directive.
The item meets all the
essential "Health and
Safety" requirements of
the relevant European
Directives.
6

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It is important that loudspeaker systems are used in a safe manner.
Professional loudspeakers are capable of producing extremely high sound levels and
should be used with care. Hearing loss is cumulative and can result from levels above 90dB
if people are exposed for an extended period.
Never stand close to loudspeakers driven at high level.
Suspending the system should only be done by qualified personnel following safe rigging
practices. Secure fixings to the building structure are vital. Seek help from architects,
structural engineers or other specialists if in any doubt.
:
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Connect the power supply only to an appropriate power adapter.
Do not install the speaker in wet or humid locations without using weather protection.
Do not allow water or any foreign object to get inside the speaker. Do not put objects
containing liquid on, or near, the unit.
To reduce the risk of overheating the amplifier, avoid exposing it to direct sunlight. Do not
install the unit near heat emitting appliances, such as a room heater or stove.
No naked flame sources such as lighted candles should be placed near the device.
The speaker should be placed so that its location does not interfere with its proper
cooling.
Do not attempt to disassemble the unit. The unit contains no user serviceable parts.
Repairs should be performed only by factory trained service personnel.
Be sure that the adapter has the correct voltage value.
:Do not operate the speaker for an extended period of time with the sound distorting. This
is an indication of malfunction, which in turn can cause heat to generate and result in a fire.
4. SAFETY
7

5. WARRANTY
K-array KT20ma are warranted against
manufacturing defects in materials or
craftsmanship over a period of
from the date of original purchase. During
the warranty period K-array will, at it's
discretion, either repair or replace
products which prove to be defective
provided that the product is returned in its
original packaging, shipping prepaid, to an
authorized K-array service agent or
distributor. K-array cannot be held
responsible for defects caused by
2 years
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Self-powered
Single 2" long excursion full range driver
Wide range frequency response
Integrated 4-pin Phoenix connector
Electronically protected
Full aluminum ultra strong frame
Top quality components for outstanding
performance
Available in Black or Aluminum
High dynamic range capability
Integrated connection points for accessories
Only 400g of weight
6. KEY FEATURES & APPLICATIONS
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Background music systems
in restaurants and clubs
High quality distributed
systems for paging and music
Exhibit audio for museum
displays
Space-sensitive fill for
theatres
Under balcony applications
Features Applications
unauthorized modifications, improper use,
negligence, exposure to inclement
weather conditions, act of God or accident,
or any use of this product that is not in
accordance with the instructions provided
by K-array.
K-array is not liable for consequential
damages.
This warranty is exclusive and no other
warranty is expressed or implied.
This warranty does not affect your
statutory rights.
8

RVC
0 dB
-12 dB
1
2
3
4
. DC Power and Signal
INPUT
. Remote Volume
Control connector
. Gain control
. Specifications
7. AMPLIFIER
Each KT20ma powered speaker contains a
30 W Class D amplifier that is fully protected
from short circuits and includes an auto
recovery feature.
A remote power supply for the CMOS
circuitry ensures that the total harmonic
distortion (THD) is as low as possible. Power
supply decoupling also eliminates
oscillations that can be caused by long cable
lengths between the amplifier and the
speaker.
REAR PANEL
A 4-pin Phoenix connector on the rear
panel supplies both the DC power and
balanced audio signal to the amplifier, using
a common ground (GND).
A 2-pin white connector allows for
connection of a potentiometer for remote
volume control (RVC) capability.
This is wired in parallel to an on-board
potentiometer with a 0dB to -12dB range.
In RVC operating mode this should be set at
full gain to ensure the widest dynamic range.
(1)
(2)
(3)
9

8. WIRING AND CONNECTORS
1
2
3
4
5
6
7
8
. Signal cold pin input
. Signal hot pin input
. DC power positive input
.
Signal cable shield
DC power negative input,
. 4-pin female Phoenix connector
. 2-pin wire crimp connector
. Hot pin volume control
. Ground (shield) pin volumel control
RVC
8
7
Audio source
The KT20ma receives DC power and balanced
audio from the four-pin Phoenix connector on
its back panel. The connector's four pins
include two for DC power (positive and
negative) and two for the cold and hot pin of the
balanced audio . The shield must be
connected with DC negative .
When using an unbalanced audio cable,
connect the shield with the first of four pins
and the hot with pin
with the negative DC power.
The connector accepts single conductors up to
. Then connect the shield
(3), (4)
(1), (2)
(4)
(1)
(2)
(1)
When wiring KT20ma cable
connections, make sure each
pin in the connector is wired correctly to
avoid damage to the loudspeaker and
polarity reversal, which can affect
system performance.
For long distances use a balanced
sound source with a balanced
screened cable.
10
12AWG (American Wire Gauge) or 2.5mm .
A single composite cable (such as the
Belden 1502R) can be used to connect a
number of KT20ma speakers. To do this,
wire the cable connector plugged into the
first KT20ma with a second jumper cable
both connected to the power supply and
audio source. Extend this to the next
speaker, and so on.
2

Cable
Gauge
Resistence Approximate
MAX. length (1
KT20ma per
line)
Approximate
MAX. length
(4 KT20ma
per line)
Approximate
MAX. length
(8 KT20ma
per line)
Approximate
MAX. length
(24 KT20ma
per line)
2.50
mm2
0.0052 710 m 177 m 88 m 30 m
1.50
mm2
0.01076 350 m 87 m 43 m 14 m
1.00
mm2
0.02087 180 m 45 m 22 m 7 m
0.75
mm2
0.03307 110 m 27 m 13 m 4 m
9. POWER CABLE LENGTHS and GAUGES
11
To connect a remote volume control you will
need the specific cable sold as an accessory.
Solder the shield to the ground of the
potentiometer and the remaining wire to the
hot pin of it.
There is only one way to connect this
accessory to the speaker.
Remote Volume Control cable

etc.
AUDIO
SOURCE
DC POWER
K-AL66
K-AL75
K-AL240
BALANCED SHIELDED CABLE
up to 6 up to 24
up to 7
DC POWER
10. POWER SUPPLY
To function properly, the KT20ma requires a 24 V DC, 10 VA stabilized power supply (1/3 of
the continuous delivered power). The KT20ma can operate with a voltage range from 12 to 24
Vdc but lower supply voltage reduces performance. A 24Vdc stabilized power supply is
strongly suggested.
K-array also provides a range of power supplies: K-AL66 (66 VA max), K-AL75 (75 VA max,
for DIN rail mounting), K-AL240 (240 VAmax, for DIN rail mounting).
12
Cable
Gauge
Resistence Approximate
MAX. length (1
KT20ma per
line)
Approximate
MAX. length
(4 KT20ma
per line)
Approximate
MAX. length
(8 KT20ma
per line)
Approximate
MAX. length
(24 KT20ma
per line)
12 AWG 0.0016 2400 ft 600 ft 300 ft 100 ft
14 AWG 0.00253 1500 ft 375 ft 187 ft 62 ft
16 AWG 0.00402 950 ft 237 ft 118 ft 39 ft
18 AWG 0.00636 600 ft 150 ft 75 ft 25 ft
20 AWG 0.01008 350 ft 87 ft 43 ft 14 ft

11. INSTALLATION
1. Disassemble the bracket from
the speaker's body.
2. Fix the bracket to the mounting
surface with appropriate anchors or
screws
3. Connect the cables to the
speaker.
4. Re-assemble the body of the
speaker to the fixed bracket.
13

12. SERVICE
To obtain service:
Any attempt to modify or replace components of the device will invalidate your
warranty. Service must be performed by an authorized K-array service center.
1) Contact the official K-array distributor in your country. They will direct you to the service
centre.
2) If you are calling for service, have the serial number(s) of the unit(s) at hand for
reference. Ask for Customer Service, and be prepared to describe the problem clearly and
completely.
3) If the problem cannot be resolved over the phone, you must return the unit for service.
4) You will be given an RA (Return Authorization) number for job tracking. Refer to this
number on shipping materials and in all correspondence concerning the repair. Shipping
charges are the responsibility of the purchaser.
1414
Cleaning:
•Clean the product enclosures using a soft, dry cloth only.
•Do not use any solvents, chemicals, or cleaning solutions containing
alcohol, ammonia, or abrasives.
•Do not use any sprays near the product or allow liquids to spill into any
openings.

15
13. SPECIFICATIONS
horizontal
500 Hz
250 Hz
8 KHz
4 KHz
1 KHz
500 Hz
250 Hz
8 KHz
4 KHz
1 KHz
vertical
KT20ma
Acoustics
Speakers power handling 18 W(AES)
Max power 30 W 1
Impedance 8 Ω
Frequency range 150 HZ - 18 KHz +/- 3dB
SPL 1W/1mt 87 dB 2
Maximum SPL 101 dB continuous - 107 dB peak
Coverage
Horizontal 90°
Vertical 90°
Crossover
Type
Frequency 150Hz 24dB/oct
Transducers
Full-range 2” Neodymium cone driver with 0.75” voice coil
Audio Input
Connectors 4-pin Phoenix connector
Wiring PIN1= cold (-) PIN2 = hot (+) PIN4 = Ground
Power Audio Output
Connectors -
Remote control Input
Connectors -
Power Input
Connectors 4-pin Phoenix connector
Wiring PIN3= V+ PIN4 = Ground
Type 1 module class D electronically processed
Power 30 W @ 8Ω 3
Protection Dynamic limiter, over current, over temp, short circuits
Input impedance 112K balanced 56K unbalanced
Distortion F = 1 KHz Po = 20W 0.2% THD+N
DC Power
Operating range Standard 12 - 24 Vdc
P. nom / I. nom 1A / 24 Vac
Minimum operation voltage 11 Vac
Maximum operation voltage 25 Vac
Max continuous
burst current Standard 0.75A(>10 sec) - 3A (<1 sec)
Physical
Dimensions 6.4 x 8.3 x 14.3 cm (2.52 x 3.27” x 5.63”)
Weight 0.34 Kg (0,75 lbs)
90°
120° 60°
30°
-30°
-60°
150°
-90°
180°
-150°
-120°
0° frontback
90°
120° 60°
30°
-30°
-60°
150°
-90°
180°
-150°
-120°
0° frontback
DISPERSION GRAPHS
Notes for data
1. Maximum RMS applicable power for a musical signal, the
reference signal is the one proposed by EIAJ standard.
2. Measured @4 mt then scaled @1 mt
the nominal load impedance.
New materials and design are introduced into existing products
without previous notice. Present systems may differ in some
respects from those presented in this brochure.

The contents of this manual are furnished for
informational purpose only. Hp Sound Equipment s.r.l.
assumes no responsability for any errors or
inaccuracies that may appear in this manual.
Hp Sound Equipment s.r.l. reserves the right to make
modifications without prior notice.
HP Sound Equipment s.r.l. www.k-array.com
Viale Roma 7/i 50037 San Piero a Sieve (Firenze) Italy -
tel [phone] fax e-mail:[phone] [e-mail]
K-array declares that this device is in compliance with
the applicable CE standards and regulations.
Before putting the device into operation, please
observe the respective country-specific regulations!
Approval
Please dispose of this product at the end of its
operational lifetime by bringing it to your local
collection point or recycling centre for such
equipment.
WEEE

www.k-array.com
Viale Roma 7/i
50037 San Piero a Sieve (Firenze)
Italy
tel [phone]
fax [phone]
e-mail:
by
HP Sound Equipment s.r.l.
[e-mail]
K
array