EX6 User Guide 01

User Guide
The future of sound.
Made perfectly clear.
At KV2 Audio our vision is to constantly develop
technologies that eliminate distortion and
loss of information providing a true dynamic
representation of the source.
Our aim is to create audio products that absorb
you, place you within the performance and deliver
a listening experience beyond expectation.
Your EX6 is covered against defects in material and
workmanship. Refer to your supplier for more details.
In the unlikely event that your EX6 develops a problem,
it must be returned to an authorised distributor, service
centre or shipped directly to our factory. Because of
the complexity of the design and the risk of electrical
shock, all repairs must be attempted only by qualified
technical personnel. If the unit needs to be shipped
back to the factory, it must be sent in its original carton.
If improperly packed, the unit may be damaged. To
obtain service, contact your nearest KV2 Audio Service
Centre, Distributor or Dealer.
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How to use this manual
Icons used include
Important Safety Instructions
Introducing the EX6
Acoustic Components
Enclosure Design
Chapter 1 AC Power
AC Power
Voltage Requirements
The Power Connector
Current Requirements
AC Cable Colour Coding
Safety Summary
Chapter 2 Audio Signal
The EX6 Control Panel
Audio Input and Output
Amplifiers and Filters
LED Status Light
Power On / Signal LED
Stage Monitor / High Pass Filter
Chapter 3
Using Multiple Boxes
Appendix A
EX6 Specifications and Data
How to use this manual
As you read this manual, you’ll find figures
and diagrams to help you understand and
visualise what you’re reading. You’ll also find
numerous icons that serve as cues to flag
important information or warn you against
improper or potentially harmful activities.
Icons used include
“NOTE” identifies an
important or useful piece
of information relating to
the topic under discussion.
“TIP” offers a helpful
tip relevant to the topic
at hand.
10. Do not defeat the safety purpose of
the grounding type plug. A grounding type
plug has two blades and a third grounding
connector. The third connector is provided
for your safety. If the provided plug does not
fit into your outlet, consult an electrician
for replacement of the obsolete outlet.
11. Protect the power cord from being walked
on or pinched, particularly at plugs, convenience
receptacles, and the point where they exit from
the loudspeaker. The AC mains plug or appliance
coupler shall remain readily accessible for operation.
12. The device must be plugged into a mains socket
outlet with a protective ground conductor.
13. Only use accessories specified by KV2 Audio.
14. Install the product only with rigging specified
by KV2 Audio, or sold with the loudspeaker.
“CAUTION” gives notice
that an action can have
serious consequences and
could cause harm to
equipment or personnel,
delays, or other problems.
Important Safety Instructions
1 Read all product instructions.
2. Keep printed instructions, do not throw away.
3. Respect and review all warnings.
4. Follow all instructions.
5. Do not use this loudspeaker near water,
in unprotected out door areas or in rain or
wet conditions.
6. Clean only with dry cloth.
7. Do not block any ventilation openings.
8. Install in accordance with KV2 Audio
recommended installation instructions.
9. Do not install near any heat sources
such as heat radiators, heat registers, stoves,
or other apparatus that produce heat.
CAUTION: Rigging should only be
done by experienced professionals.
15. Unplug this loudspeaker during lightning
storms or when unused for long periods of time.
16. Refer all servicing to qualified service
personnel. Servicing is required when the
loudspeaker has been damaged in any way,
such as when the power-supply cord or plug
has been damaged; liquid has been spilled
or objects have fallen into the loudspeaker;
rain or moisture has entered the loudspeaker;
the loudspeaker has been dropped; or
when for undetermined reasons the
loudspeaker does not operate normally.
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Introducing the EX6
The EX6 is a 2-way high output, active,
compact, full-range speaker system. Design
objectives for the EX6 were focused on the
expansion of KV2 Audio’s primary philosophy
of speakers systems with increased dynamic
range, very high output and a consistent
sound character no matter what the output
level. The EX6 sets new levels of performance
for compact cabinets achieved through the
integration of new amplifier, transducer and
electronic control technologies that are closely
tied to a passion for taking performance to
the next level.
Amplifier power, electronic crossovers, phase
alignment, equalisation and speaker protection
are integrated into the EX6’s amplifier module.
The EX6’s high frequency compression driver
is powered and controlled by KV2 Audio’s
standard low intermodulation distortion,
Class A/B, push-pull, designed to produce the
lowest intermodulation distortion possible and
the highest audio quality in the critical mid
and high operating bands.
An improved version of KV2 Audio’s current
enhancing, Bass driver switching amplifier has
been developed for the EX6. The new configuration improves overall system efficiency and
increases output allowing passive radiation of
heat to take place through a unique “fin-less”
heat sink that can be placed in any position or
direction. Additionally, the EX6 amplifier unit
contains an internally located electric fan that is
operated by a temperature sensing circuit
which will slowly bring the fan online as required.
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Acoustic Components
KV2 Audio has developed a revolutionary
woofer technology called Trans-Coil™. The
woofer has two coils, a standard voice coil
assembly and a second coil placed directly on
the neodymium magnetic circuit’s pole piece.
This technology eliminates voice coil inductance
resulting in a flat impedance response above
the resonance point and achieves faster transient
response through increased force and control
of the moving mass. It also linearises acoustic
and electrical phase response, reduces harmonic
distortion and increases power transfer and
transducer speed. Through this technology,
the speaker now behaves like both a woofer
at lower frequencies and like a mid-range at
higher frequencies allowing a seamless transition
to take place at the crossover frequency.
The EX6’s patent pending NVPD neodymium
compression driver is loaded on a constant
directivity horn designed for smooth, wide
dispersion performance. More importantly,
it has also been designed to precisely match
the power response of the woofer at the
crossover frequency, a crucial design objective
that ensures smooth transition and minimizes
The EX6 horn design is based on constantdirectivity geometry with an emphasis on
generating very low air distortion artifacts,
maintaining low transducer compression ratios,
high output and wide dispersion (100˚ x 100˚).
The horn is an injected molded aluminium
part that functions as a heat dissipater for the
compression driver’s neodymium magnetic
motor structure.
Enclosure Design
The EX6 is a very compact, asymmetrical
geometry enclosure design allowing it
to be used in a variety of applications.
The handle’s M10 point is used alongside a
similar M10 point on the bottom of the box
when utilising an EX6 Horizontal Bracket
Four principal mounting bolts also provide
an Omnimount™ bracket point.
There are two side-mounted M10 hang
points that can be used with the
EX6 Vertical Bracket or eyebolts.
EX6 aluminium handle
The optional Pole mount adaptor sits over the two
lugs on the rear of the cabinet and slides
upwards-locking into place and supporting
the bottom and rear of the cabinet.
A specially moulded aluminium handle was
designed and fitted to the top of the cabinet.
It functions as the principle pick up handle as
well as providing several fixed installation and
hanging solutions. It has a centrally located
M10 hang point as well as four additional M6
bracket points found underneath the KV2 logo.
Heavy duty cover for EX6
part name: COVER EX6
part number: KVV 987 159
Pole mount adaptor
part name: Stand Adapter EX6
part number: KVV 987 151
- padded
- including locking bolt
Heavy duty telescopic speaker
pole for ES/EX series
part name: KV2-H
part number: KVV 987 130
Vertical bracket for EX6
part name: EX6 Vertical Bracket
part number: KVV 987 148
- including two connection bolts
- M20
Telescopic speaker pole for ES/EX
part name: KV2-L
part number: KVV 987 041
Horizontal bracket for EX6
part name: EX6 Horizontal Bracket
part number: KVV 987 149
- including two connection bolts
- 35mm
Page | 5
Chapter 1
AC Power
The EX6 uses a PowerCon 3-pole AC main
system with locking connectors to prevent
accidental disconnection. The main AC
connector (blue) serves as the power input.
The EX6 operates in either 115V or 230V
modes. Althoug pre-configured at the factory,
the unit’s operating voltage mode can be
changed in the field.
Voltage Requirements
The EX6 operates safely and without audio
discontinuity if the AC voltage stays within
the operating window of 100V-130V in 115V
mode and 200V-250V when working in
230V mode, at 50 or 60Hz.
If the On LED does not
illuminate or the system does not
respond to audio input, remove
AC power immediately. Verify that the voltage
is within the proper range. If the problem
persists, please contact KV2 Audio or an
authorized service center.
If the voltage drops below the low boundary
of its safe operating range, the loudspeaker
will shut down if the voltage does not rise
above the low boundary before storage circuits
are depleted. How long the loudspeaker will
continue to function during brownout depends
on the amount of voltage drop and the audio
source level during the drop. If the voltage
increases above the upper boundary of the
range, the power supply can be damaged.
It is recommended that the
voltage supply be within the rated
voltage window. This ensures that
AC voltage variations from the service entry or peak voltage drops due to cable runs - do
not cause the amplifier to cycle on and off or
cause damage to the power supply.
NOTE: For best performance, the AC
cable voltage drop should not exceed
10 volts, or 10 percent at 115 volts
and 5 percent at 230 volts.
Make sure that even with the AC voltage drop,
the AC voltage always stays within recommended
operating ranges. The minimum electrical service
amperage required by an EX6 speaker system
is the sum of each loudspeaker’s maximum
continuous rms current. An additional 50 percent
above that amperage is recommended to prevent
peak voltage drops at the service entry.
The Power Connector
The EX6 requires a grounded outlet. It is
very important that the loudspeaker AC supply
be properly grounded in order to operate
safely and properly. Use the PowerCon AC
cable-wiring diagram overleaf to create international or special-purpose power connectors:
Power connector assembly
Page | 6
Current Requirements
Each EX6 requires approximately 2.5 Amps
max at 115V AC for proper operation.
This allows up to six EX6’s to be powered
from one 15 A breaker at 115V and up to
twelve EX6’s at 230V.
The EX6 presents a dynamic load to the
AC mains, which causes the amount of current
to fluctuate depending on quiet or loud
operating levels. Since different cables and
circuit breakers heat up at varying rates, it is
essential to understand the types of current
ratings and how they correspond to circuit
breaker and cable specifications.
The maximum long-term continuous current
is the maximum rms current during a period
of at least ten seconds. It is used to calculate
the temperature rise in cables, in order to select
a cable size and gauge that conforms to
electrical code standards. It is also used to select
the rating for slow-reacting thermal breakers.
The burst current is the maximum rms current
during a period of approximately one second,
used to select the rating of most magnetic
breakers and to calculate the peak voltage
drop in long AC cables according to the formula:
V pk (drop)= I pk x R (cable total)
The ultimate short-term peak current is used
to select the rating of fast reacting magnetic
breakers. Use the table below as a guide
when selecting cable gauge size and circuit
breaker ratings for your operating voltage.
Current Draw
115V Mode
230V Mode
Max Long Term
2.5 A rms
1.25 A rms
Burst Current
3.75 A rms
1.85 A rms
Short Term Peak
10 A peak
5 A peak
AC Cable Color Coding
If the colours referred to in the diagram don’t
correspond to the terminals in your plug, use
the following guidelines: Connect the blue wire
to the terminal marked with a N or coloured
black. Connect the brown wire to the terminal
marked with an L or coloured red. Connect
the green and yellow wire to the terminal marked
with an E or coloured green or green and yellow.
Power cable color coding
The EX6 requires a
ground connection. Always use
a grounded outlet and plug.
Safety Summary
To reduce the risk of electric shock, disconnect
the loudspeaker from the AC mains before
installing audio cable. Reconnect the power
cord only after making all signal connections.
Connect the loudspeaker to a two pole,
three-wire grounding mains receptacle.
The receptacle must be connected to a
fuse or circuit breaker. Connection to any
other type of receptacle poses a shock
hazard and may violate local electrical codes.
Do not allow water or any foreign object
to get inside the loudspeaker. Do not put
objects containing liquid on or near the
unit. To reduce the risk of overheating the
loudspeaker, avoid exposing it to direct
sunlight. Do not install the unit near heatemitting appliances, such as a room heater
or stove. This loudspeaker contains potentially
hazardous voltages. Do not attempt to
disassemble the unit. The unit contains no user
serviceable parts, repairs should be performed
only by factory trained service personnel.
Page | 7
Chapter 2
Audio Signal
The EX6 Control Panel
The EX6 features an easy to use control panel
featuring AC power in, audio input and
output, level control, LED status light and a
High Pass filter.
Audio Input and Output
The EX6 uses a balanced, female XLR
connector for the audio input connector, and
a male XLR connector to provide through
output signal. The through output connector,
wired in parallel to the audio input, will
continue to provide the input signal if the
EX6 is turned off. The audio input circuit
presents a 20 kΩ balanced input impedance to
a three-pin XLR connector with the following
Main input
Through output
Pin 1 - Ground
Pin 2 - Signal (+)
Pin 3 - Signal (-)
Case - Earth (AC) ground and chassis
Page | 8
Audio signal can be daisy-chained using the
through output connector on the input
panel. A single source can drive multiple
EX6 speakers with a paralleled input loop.
If you are driving multiple EX6’s make certain
that the source device can drive the total
load impedance presented by the paralleled
input circuits.
The audio source must be capable of producing a minimum of 0 dB (0.775V volts rms) to
produce the maximum peak SPL over the
operating bandwidth of the loudspeaker.
To avoid distortion from the source, make sure
the source equipment provides an adequate
drive circuit design for the total paralleled load
impedance presented by the speakers. The
input impedance for a single loudspeaker is
20 kΩ. If “n” represents the number of EX6
loudspeakers in a system, paralleling the inputs
of n loudspeakers will produce a balanced input
load of 20 kΩ divided by “n”.
If the loudspeaker produces
noises such as hiss and popping,
disconnect the audio cable from the
loudspeaker, if the noise stops, then most
likely the problem is not with the loudspeaker.
Check the audio cable, source, and AC power
for the source of the problem.
Ensure that all cabling carrying
signal to multiple amplifiers
and active speaker systems is wired
correctly. Make sure that the polarity has not
been reversed. Reversed polarity can cause
severe degradation in frequency response and
can also impact the dispersion characteristics
of the speaker.
Thermal protection
In the unlikely event of over heating the speaker
system will shut down. You can expect for
the system to be down for at least 2-3 minutes
depending on the ambient temperature and
whether the system is being exposed to direct
sun light.
The EX6 features a finless
heatsink that allows it to operate in
any position. There is also an internal
fan located inside the amplifier module.
The fan speed is dependent on two factors;
the temperature of the heat sink and the
output level of the speaker.
As temperature increases, so does fan speed.
As audio level increases, fan speed also
increases as a preventative measure designed
to keep the heat sink temperature low. Under
normal operating conditions, the fan noise
remains inaudible. Please contact KV2 Audio
or a local service representative should the
system enter a thermal condition under normal
operating conditions.
Power On / Signal LED
This LED turns green when the speaker is
turned ON. The light will turn yellow when
signal is present.
Low Cut Switch
The EX6 features a 90 Hz High Pass Filter.
Pressing the button engages this filter
allowing the speaker to reproduce frequencies
only above 90Hz
The EX6 employs a protection system based
on rms limiting of the amplifiers. This type of
protection strategy allows the speaker to operate safely under overload conditions. When
the rms “limiter” engages, the output level of
both amplifiers is reduced to a safe operating
level. This type of protection allows the
frequency response of the system to remain
unchanged as the level is lowered. By not
compressing or limiting peak signal, dynamics
also remain unchanged. The control objective
is to regulate the operating temperature of
the transducers magnetic circuits long term.
This ensures no impact on performance due
to power compression and allows the components to retain their ability to reproduce high
dynamics. When overdriven the rms limiter will
disengage only if the input level is turned down.
To keep your EX6 speakers in optimum
condition we recommend transportation in
an optional KV2 Audio EX6 padded nylon
cover (EX6CVR) or a professional road case.
Page | 9
Chapter 3
Using Multiple Boxes
Fig. A
Good quality
where 2
cabinets must
be used
Fig. B
KV2 speakers are far more accurate, defined
and phase coherent than virtually any other
loudspeaker on the market. This very defined
phase accuracy comes into play when trying
to stack the speakers.
It is very important not to use KV2 Audio
Mid-High boxes directly side by side. (Fig. A)
This will produce a poor quality sound cancelling
out perfectly, which reduces overall output.
Defined by the way our ears work, their position
on our heads and the brain’s understanding of
the signals they produce, each ear will hear two
sources in the horizontal plane very close
together, but very slightly misaligned in arrival
With our ears positioned on each side of our
head, rather than on the top and bottom, they
are very good at pinpointing precisely a sound
in the Horizontal plane (i.e. it’s exact position
left to right in the sound field). Vertically (trying
to pin point sound up and down) they are far
less accurate and have a greater tolerance for
error. Recieving multiple signals so phase
Page | 10
Good quality with
200˚ coverage
Fig. C
coherent, but misaligned horizontally, leads
the brain to get confused, which in turn leads
it to interpret a confused poor quality, low
intelligibility sound.
KV2 exploits the additional vertical tolerance
that the brain has by only stacking multiple
cabinets vertically, as do modern Line arrays,
but KV2 still keeps as close as possible to the
theory of point source by using a maximum
of two cabinets together, keeping the horns
as far apart as possible. (Fig. B) This reduces
the cancellations that most line arrays suffer
from particularly in the high frequencies.
The only exception to this maximum of two
cabinets would be in a down fill / side fill
application where an additional cabinet can
be deployed but must be separated from the
main forward firing system by an amount of
degrees equivalent to the vertical or horizontal
dispersion of that speaker. (Fig. C )
Combining boxes and building systems in this
way will give the maximum overall output,
best audio quality and consistent, even coverage.
System Acoustic Performance
-3dB Response
-10dB Response
Max SPL Long-term
Max SPL Peak
Crossover Point
68Hz – 20kHz
62Hz – 28kHz
and Data
High Frequency Section
Throat Exit Diameter / Diaphragm Size
Diaphragm Material
Magnet Type
1” / 1.75”
Nitride Titanium
Horn with Constant Directivity
Coverage Horizontal / Vertical
100° x 100°
High Frequency Amplifier Specification
Rated Continuous Power
Operating Bandwidth
Class AB
20 W
2.0kHz – 28kHz
Low Frequency Section
Acoustic Design
Woofer Size / Voice Coil Diameter / Design
Diaphragm Material
Magnet Type
Front Loaded, Bass Reflex
6” / 1.75” / Trans Coil
Epoxy Reinforced Cellulose
Bass Amplifier Specification
Rated Continuous Power
Operating Bandwidth
High Efficiency Switching
62Hz – 2.0kHz
Signal Input
Input Impedance
Input Sensitivity
20 kΩ
0.775V rms
Physical Dimensions
390mm (15.35”)
220mm (8.66”)
270mm (10.63”)
13kg (28.6lbs)
Power Connector
Neutrik PowerCon®
Operating Voltage
100-120V @ 60Hz
230-250V @ 50Hz
Recommended Amperage
2.5A 115V
1.25A 230V
Page | 11
The future of sound.
Made perfectly clear.
At KV2 Audio our vision is to constantly develop
technologies that eliminate distortion and
loss of information providing a true dynamic
representation of the source.
Our aim is to create audio products that absorb
you, place you within the performance and deliver
a listening experience beyond expectation.
KV2 Audio, Nádražní 936, 399 01 Milevsko, Czech Republic
Tel. +44(0)1423 816868