KV2 Audio JK1 User manual

User Guide
JK DI-Boxes
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 expectations.
· JK1 - Active DI BOX · JK2 - Stereo DI BOX
· JKA - Acoustic DI BOX · JKP - Passive DI BOX
· JKT - Tone Generator

Contents · JK DI-Boxes
Contents · JK DI-Boxes
Contents
JK series · Overview 2
JK1 - Active DI BOX - Line Driver 3
Features 3
Specications 4
Connection 4
JK2 - Stereo DI BOX - Line Driver 5
Features 5
Specications 6
Connection 6
JKA - Acoustic DI BOX - Line Driver 7
Features 7
Specications 8
Connection 8
JKP - Passive DI BOX - Transformer Balanced 9
Features 9
Specications 10
Connection 10
JKT - Tone Generator 11
Features 11
Specications 12
Connection 12
Warranty · Service 13
Notes 14 - 16

2
JK series · Overview
JK series · Overview
Named after company founder and chief engineer, George 'Jiri' Krampera, the JK Series of DI Boxes and Audio
Tools retain KV2's philosophy of the best possible signal path from source to speaker. The JK Series consists of
the JK1 Single Channel DI, JK2 Stereo DI, JKA Single Channel Acoustic DI with Resonance Notch Filter and the JKP
Single Channel Passive DI and Mic Splitter. Also included in the range is the JKT Tone Generator, a useful solution-
provider audio tool that will assist every engineer in the tuning and checking of systems and components.
KV2's JK series represents the pinnacle in DI technology, by oering a higher headroom and lower output
impedance, than any other DI on the market. This simply means the JK Series can deliver crystal clear, distortion
free audio from the hottest sources, without a hint of signal degradation over greater distance. KV2 has optimized
the use of phantom power with a special switching power supply on the JK Series, to enable an impressive 20
volts of peak power on the internal rails. This allows the JK Series to deliver 50 Ohms on the XLR output giving
true line driver capability delivering greater audio integrity and the ability to send high quality signal four times
the distance of it's nearest competitor.
All JK Series DI boxes are hand built in the Czech Republic utilizing high quality components and transformers.
Full transformer balancing ensures the highest possible signal integrity without interference from RF or ground
loops. The heavy-duty steel enclosure provides maximum protection for the electronics and further shielding
against external interference. KV2 stands by the build quality of these units with a full 5-year warranty.
JK1 - Active DI BOX - Line Driver
The JK1 features two 1/4" jack inputs with mix or parallel function with a variable low cut lter and 15dB pad.
Phase Shift and Ground Lift switches are also available. The JK1 is ideal for connection of single keyboards, guitars
or instrument amplier output conditioning or combining two inputs via the mix function.
JK2 - Stereo DI BOX - Line Driver
The JK2 features two 1/4" jack inputs with parallel monitor outputs as well as RCA inputs. The JK2 has two
completely separate channels and can be used with two dierent instruments or stereo instruments. The JK2
features a variable Pad, Phase Shift and ground lift.
JKA - Acoustic DI BOX - Line Driver
The JKA is a dedicated DI for acoustic instruments. The JKA features a high-impedance 1/4" jack input capable
of receiving signal from all types of pick-ups. A +10dB gain boost is available for low-level instruments. The JKA
also features a tunable notch lter for eliminating the resonant frequency in an acoustic instrument, reducing
feedback issues.
JKP - Passive DI BOX - Transformer Balanced
Serves as a universal passive DI box with low output impedance. The JKP features one XLR input and two 1/4"
jack inputs in parallel. The JKP is dedicated for multiple instruments connection such as keyboards, guitars
or instrument ampliers output conditioning. The JKP also features phantom power supply transmission for
condenser microphone connection and output signal conditioning.
JKT - Tone Generator
The JKT is the perfect tool for checking and tuning PA systems along with various pieces of equipment. Phantom
powered it has two XLR Outputs and 1/4" Jack Out. The JKT delivers a full range of tones from 20Hz through
to 30kHz, as well as both White Noise and Pink Noise.

3
JK1 · Features
JK1 · Features
JK1 - part number KVV 987 205
JK1 - Active DI BOX - Line Driver
The JK1 features two 1/4" jack inputs with mix or parallel function with a xed low
cut lter and 15dB pad. Phase Shift and Ground Lift switches are also available.
The JK1 is ideal for connection of single keyboards, Guitars or instrument amplier
output conditioning or combining two inputs via the mix function.
1. Phantom Power Supply
For ease of use, maximum headroom and low noise the JK1 is powered by
phantom power from the mixing console. A green LED indicates the presence of
phantom power. Simply switch on phantom power on your console and you are
good to go.
2. Multiple Inputs
The JK1 features two asymmetrical inputs with 1/4" jack connectors. These inputs
can be set as a parallel (input is present on thru), mixed together (inputs placed into
the input and thru are mixed together) or parallel with -15dB attenuation on input.
3. Low Cut Switch
Selects the high pass lter frequency point between 160 and 80Hz. Ideal for
eliminating unwanted bass rumble from instruments.
4. Low Impedance Output
The main symmetrical LINE OUT output has an impedance of 50Ω and it is
Intended for connection to a mixing desk. The output is separated galvanically
from the input.
5. PHASE Switch Selector
Selects between 0° and 180° for LINE OUT output. This switches the XLR
pin-2 and pin-3 to interface with older equipment. Also can be used when
the instrument is being reproduced by the DI and microphone to avoid
cancellation.
6. GND Ground Switch Selector
This ground-lift switch breaks the ground between the input & the output
to eliminate hum and noise caused by ground loops. The GND position - the
grounds for the input and output are interconnected ideal if the signal source
is not grounded. The LIFT position - the grounds for the input and the output
are disconnected. It is used if the signal source is grounded and you are
experiencing ground loop problems.

4
JK1 · Specications · Connection
JK1 · Specications · Connection
Specications
JK1 - PARALLEL INPUTS SETUP EXAMPLE
System Acoustic Perfomance
-1dB Response 20Hz to 100kHz
Dynamic Range >130dB
Total Harmonic Distortion <0.002%
Signal Input
Input Channels 2x 1/4" Jack
Input Impedance 1M / 5k
Max. Input voltage 5V / 20V peak
Signal Output
Output Channels XLR (line)
Output Impedance 50
Features
Gain 0 / -15dB
Phase 0° / 180°
High Pass Filter OFF, 80, 160Hz
Indicators Power-ON LED
Ground Mode GND / Lift
Power
Phantom Power 48 to 56V / 8mA
Cabinet
Cabinet Material Heavy duty metal
Physical Dimensions
Height 40 mm (1.57")
Width 80 mm (3.15")
Depth 131 mm (5.16")
Weight 610 g (1.34lbs)
JK1 - MIX INPUTS SETUP EXAMPLE

5
JK2 - Stereo DI BOX - Line Driver
The JK2 features two 1/4" jack inputs with parallel monitor outputs as well as RCA
inputs. The JK2 has two completely separate channels and can be used with two
dierent instruments, or stereo keyboards and other two channel sources such as
laptops, computers and Ipad. The JK2 features a variable pad, Phase shift
and Ground lift switch.
1. Phantom Power Supply
For ease of use, maximum headroom and low noise the JK2 is powered by
phantom power from the mixing console. A green LED indicates the presence of
phantom power. Simply switch on phantom power on your console and you are
good to go. The JK2 can be powered to channel A, channel B or both outputs,
which provides best results.
2. Multiple Inputs
Each channel features two paralleled inputs (A, B) each equipped with 1/4" jack
connectors and stereo RCA inputs on the rear of the unit.
3. GAIN Switch
Using the GAIN switch selector the input sensitivity of the JK2 can be adapted at three levels: 0dB, -12dB, -24dB,
so very high-level inputs can be suitably reduced for clear, distortion-free reproduction.
4. XLR 50ohm Outputs
The JK2 includes two LINE OUT outputs with XLR connectors. Outputs work with
an impedance of 50Ω and it is intended for connection to a mixing desk.
The outputs are separated galvanically from the input.
5. PHASE Switch Selector
Selects between 0° and 180° for LINE OUT output. This switches the XLR pin-2
and pin-3 to interface with older equipment. Also can be used when the
instrument is being reproduced by the DI and microphone to avoid cancellation.
6. GND Ground Switch Selector
This ground-lift switch breaks the ground between the input & the output
to eliminate hum and noise caused by ground loops. The GND position - the
grounds for the input and output are interconnected ideal if the signal source
is not grounded. The LIFT position - the grounds for the input and the output
are disconnected. It is used if the signal source is grounded and you are
experiencing ground loop problems. The RC position - the grounds for the input
and the output are interconnected via a parallel RC combination. It is used to
suppress static disturbance.
JK2 · Features
JK2 · Features
JK2 - part number KVV 987 217

6
JK2 · Specications · Connection
JK2 · Specications · Connection
Specications
JK2 - STEREO INSTRUMENT SETUP EXAMPLE
System Acoustic Perfomance
-1dB Response 10Hz to 40kHz
Dynamic Range >130dB
Total Harmonic Distortion <0.005%
Signal Input
Input Channels 2x 1/4" Jack + 2x RCA
Input Impedance 2x 1M / 10K
Max. Input voltage 1V / 5V / 20V peak
Signal Output
Output Channels 2x XLR, 2x 1/4“ Jack THRU
Output Impedance 50
Features
Gain 0 / -12 / -24dB
Phase 0° / 180°
Indicators Power-ON LED
Ground Mode GND / Lift / RC
Power
Phantom Power 48 to 56V / 8mA
Cabinet
Cabinet Material Heavy duty metal
Physical Dimensions
Height 40 mm (1.57")
Width 80 mm (3.15")
Depth 131 mm (5.16")
Weight 630 g (1.39lbs)
JK2 - STEREO PLAYER SETUP EXAMPLE

7
JKA · Features
JKA · Features
JKA - Acoustic DI BOX - Line Driver
The JKA is a dedicated DI for acoustic instruments. The JKA features a high-
impedance 1/4" jack input capable of receiving signal from all types of pick-ups.
A +10dB gain boost is available for low-level instruments. The JKA also features
a tuneable notch lter for eliminating the resonant frequency in an acoustic
instrument, reducing feedback issues.
1. Phantom Power Supply
For ease of use, maximum headroom and low noise the, JK1 is powered by phantom
power from the mixing console. A green LED indicates the presence of phantom
power. Simply switch on phantom power on your console and you are good to go.
2. High Impedance Input
The JKA includes one 1/4" high impedance jack input. It is adapted to connect
the pick-up of acoustic instruments that require high load impedance (e.g. Piezo
electric pick-ups). By using the GAIN selector switch, the amplication of the JKA
can be increased by +10dB.
3. Line Out XLR Output
The main symmetrical LINE OUT output works with an impedance of 50Ω and it is intended for connection to
a mixing desk. The output is not separated galvanically from the input.
4. Monitor Out 1/4" Jack Output
The adjacent symmetrical MONITOR OUT 1/4" jack output has an impedance of
100Ω, the same level as LINE OUT and it is separated from the main output using
a transformer. When using a mono jack the relevant input is switched automatically
to the asymmetrical mode. It can be used for monitoring on the stage.
5. Tunable NOTCH Filter
To eliminate the dominant self-resonance, (feedback) of any acoustic instrument,
the JKA is equipped with a phase switch selector and a tunable NOTCH lter
with a switchable attenuation level of - 6dB and -12dB. Recommended method
of adjustment for the NOTCH lter:
a) Increase the amplication until the acoustic instrument feeds back
b) Suppress the acoustic feedback at low frequencies using the PHASE switch
c) Increase the amplication until the acoustic instrument feeds back again, put
the NOTCH switch selector to the - 6dB position and eliminate the feedback by
use of the potentiometer. If the acoustic feedback continues to happen at the
same frequency put the NOTCH switch selector in the -12dB position.
6. PHASE Switch Selector
Selects between 0° and 180° for LINE OUT output. This switches the XLR pin-2 and pin-3 to interface with older
equipment. Also can be used when the instrument is being reproduced by the DI and microphone to avoid
cancellation.
JKA - part number KVV 987 204

8
JKA · Specications · Connection
JKA · Specications · Connection
Specications
JKA - ACOUSTIC INSTRUMENT SETUP EXAMPLE
System Acoustic Perfomance
-1dB Response 10Hz to 40kHz
Dynamic Range >130dB
Total Harmonic Distortion <0.03%
Signal Input
Input Channels 1x 1/4" Jack
Input Impedance 1M
Max. Input voltage 2,5V / 7V peak
Signal Output
Output Channels XLR (line) + 1/4" Jack
(monitor)
Output Impedance 50 line / 600 monitor
Features
Gain 0 / +10dB
Phase 0° / 180°
Notch Filter 75Hz to 1650Hz (0, -6, -12dB)
Indicators Power-ON LED
Power
Phantom Power 48 to 56V / 8mA
Cabinet
Cabinet Material Heavy duty metal
Physical Dimensions
Height 40 mm (1.57")
Width 80 mm (3.15")
Depth 131 mm (5.16")
Weight 600 g (1.32lbs)

9
JKP · Features
JKP · Features
JKP - Passive DI BOX - Transformer Balanced
The JKP serves as a universal passive DI box with low output impedance. The JKP
features one XLR input and two 1/4" jack inputs in parallel. The JKP is designed for
multiple instrument connection such as keyboards, guitars or instrument ampliers
direct output. The JKP also features phantom power supply pass-through for
condenser microphone connection and output signal Line Driving.
1. Phantom Power Through
The JKP DOES NOT REQUIRE PHANTOM POWER TO OPERATE. When using a
condenser microphone that requires a phantom power from the mixing desk, turn
the PHANTOM THROUGH switch selector to the ON position and the RATIO switch
selector to the 1:4 position, (so that both switch selectors are in the top position). In
position 1:2, no phantom power will be passed through the unit to the microphone.
2. Monitor and Line Outputs
The symmetrical LINE OUT output works with an impedance of 100Ω and with
a ratio of 1:2 or 1:4. The adjacent MONITOR OUT output has an output impedance
of 600Ω and a level 6dB higher than the LINE OUT output. The ratio of the monitor
output is half that of the line output. (1:2 LINE = 1:1 MONITOR OUTPUT)
3. XLR and Jack Inputs
The JKP features two inputs with the XLR and 1/4" jack connector connected in
parallel. Both outputs are connected symmetrically. When using a mono jack,
the relevant input is switched automatically into the asymmetrical mode. To
split a microphone signal to dierent sources simply plug it into the XLR input.
The JKP has the ability to send high quality microphone signal long distances
(Up to 300 m).
4. RATIO Switch Selector 1:2 / 1:4
This is intended for changing the voltage and impedance ratio. For example,
a condenser microphone's impedance can be decreased 16 times (1:4 position)
which will improve the sound quality and capability of the microphone to drive
long cables. The 1:2 position can also be used to improve the sound quality on
dynamic microphones. Both inputs can be disconnected from the ground.
The 1:4 ratio is for use with high impedance sources and the 1:2 ratio is for
lower impedance sources.
5. GND Ground Switch Selectors
This ground-lift switch breaks the ground between the input & the output
to eliminate hum and noise caused by ground loops. The GND position - the
grounds for the input and output are interconnected. It is used if the signal source is not grounded.
The LIFT position - the grounds for the input and the output are disconnected. It is used if the signal source
is grounded. Interruption of the ground loop. The RC position - the grounds for the input and the output are
interconnected via a parallel RC combination. It is used to suppress static disturbance.
JKP - part number KVV 987 201