Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
Classic tube compressor/leveling
amplifier modeled after the iconic
Teletronix LA-2A*
Completely discrete signal path
Premium selection 12AX7,
12BH7 and EL84 tubes
Lag-free optical attenuator based
on original electroluminescent
technology
Custom-built MIDAS input and
output transformers
Frequency Response:
10 Hz to 20 kHz, +/- 1 dB
Gain Limiting: 0 to 30 dB
Ultra-fast attack time:
10 milliseconds
Release time: 50 milliseconds
to 5 seconds
If ever there is an official “Audio
Technology Hall of Fame”, it will
definitely include a shrine to the iconic
Teletronix LA-2A*. We pay homage to
this audio-processing pioneer that
has graced so many recordings, with
our KT-2A Classic Leveling Amplifier.
And while vintage Teletronix LA-2As
are extremely rare and expensive,
the KT-2A is amazingly affordable –
and designed for the 21st Century.
Mastering quality compression and limiting, at a price point that makes
the KT-2A equally at home in your studio – and your live rack!
Adjustable stereo-link connection
Variable pre-emphasis for
digital audio recording and
broadcasting transmission
Vintage-style meter features gain
reduction and output
Transformer balanced inputs and
outputs on Neutrik* XLR connectors
Rugged 2U rackmount chassis for
durability in portable applications
Auto-ranging universal switch-mode
power supply
3-Year Warranty Program*
Designed and engineered in the U.K.
*All third-party trademarks are the property of their respective owners.
Their use neither constitutes a claim of the trademark nor affiliation
of the trademark owners with MUSIC Group. Product names are
mentioned solely as a reference for compatibility, effects and/or
components. Warranty details can be found at music-group.com.
Building on a Classic
The KT-2A draws inspiration from the original
Teletronix LA-2A leveling amplifier, which was
first produced in the early 1960s. Since then,
Teletronix leveling amplifiers have been prized
for their smooth musical sound, and audio
engineers have utilised them at all stages
of the recording process – from tracking
to mastering.
Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
A Class Act
At the heart of the KT-2A is a vintage lag-free optical attenuator based on the very same
electroluminescent technology used in its predecessor. The KT-2A is constructed from the
highest-quality discrete components – all of which meet or exceed the LA-2A’s original specifications.
This is just one of the many ways the KT-2A brings unparalleled precision and superb signal integrity
into the new audio age.
The Warm Sound of Tubes
KT-2A owes its characteristic warmth to a set of premium, hand-selected 12AX7, 12BH7 and
EL84 tubes. This time-tested combination provides ultra low-noise analog output with the ideal
balance of tight, warm bass, silky-smooth midrange and brilliant, airy treble.
MIDAS – The Legend in Sound Quality
Ever since its formation in the 1970s, MIDAS has had a long history of innovation and leadership
in the world of audio mixing consoles. Employed by the most famous touring acts and
installations worldwide, legendary MIDAS consoles such as the XL4 and Heritage H3000 quickly
became industry standards.
MIDAS has earned an impeccable reputation due to their no-compromise approach for audio and
build-quality, and in particular for their Award-winning Mic Preamps, considered by experts as the
industry’s best-sounding designs. Building on this legacy, the XL8 and PRO Series of Live Mixing
Systems continue this great heritage of Award-winning audio quality.
KLARK TEKNIK is proud to incorporate custom-designed MIDAS Input and Output transformers in
the KT-2A for the ultimate in high-quality audio reproduction in both live and studio environments.
Find out more about MIDAS’ amazing legacy by visiting their extensive website.
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Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
Incredible Flexibility
KT-2A frequency response extends from 10 Hz to 20 kHz (+/- 1 dB), and provides the kind of flexibility
you simply won’t find in the average leveling amplifier, such as gain limiting from 0 to 30 dB with
an ultra-fast attack time of 10 milliseconds, a release time that ranging from 50 milliseconds
to a full 5 seconds, and so much more. The Limit/Compress switch lets you select between the
internally-fixed compression ratio of Compress mode and the near-infinite ratio in Limit mode,
with frequency response that extends from 10 Hz to 20 kHz (+/- 1 dB). A built-in adjustable stereolink TRS connection allows a pair of KT-2As to blend their sidechain signals for shared threshold
response between the two devices.
Controls
The controls on the KT-2A consist of a Pre-Emphasis trimmer, which adjusts the sidechain that the
compressor responds to, but does not directly affect the audio in any way. When set fully clockwise,
the sidechain responds to the full frequency bandwidth of the incoming audio. As the trimmer is
turned counterclockwise, the compressor responds less to the signal's high frequency transients.
The Peak Reduction knob controls the threshold of the compressor/limiter with an available
maximum 40 dB of gain reduction. The Output Gain knob provides any makeup gain necessary for
setting the output signal to the optimal level.
Metering
Old-school VU Meters ruled the day back in the 1960s and '70s, so we stayed true to the original with
the KT-2A's metering. The classic d'Arsonval movement averages out short duration signal peaks and
troughs, providing a much more realistic view of perceived loudness. A Meter Selection knob lets
you display either the amount of gain reduction or the output level.
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Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
Balanced Connections
The KT-2A has both XLR and 1/4" TRS balanced Inputs and Outputs with custom-designed
MIDAS transformer, both of which operate at line level. Unbalanced connections are also available
via 1/4" TS cables.
Legendary Dynamic Processing
While Teletronix may have written the book on studio compression/limiting with the legendary
LA-2A in the 1960s, we just added a new chapter to that venerable tome – the KLARK TEKNIK KT-2A!
Now audio aficionados of all means can afford the amazingly-precise dynamics processing that has
defined generations of musical excellence – both on and off the stage.
Check out the KT-2A at your KLARK TEKNIK dealer, or get yours online today!
You Are Covered
We always strive to provide the best possible Customer Experience. Our products are made in our
own MUSIC Group factory using state-of-the-art automation, enhanced production workflows and
quality assurance labs with the most sophisticated test equipment available in the world. As a result,
we have one of the lowest product failure rates in the industry, and we confidently back it up with a
generous 3-Year Warranty program.
4 of 9
Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
Dimensions
CL
REAR
424 [16.7]
CL
TOP
130 [5.1]
483 [19]
17 [0.7]
88 [3.5]
CL
21 [0.8]
FRONT
6 [0.2]
SIDE
5 of 9
Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
Technical Specifications
PeAudio Input
Power Supply
Type
XLR, 1/4" TRS, transformer balanced
Mains voltage
100 – 240 V~, 50/60 Hz
Impedance
600 Ω, balanced and unbalanced
Power consumption
30 W
Maximum input level
+20 dBu, balanced and unbalanced
Fuse
T1AH 250 V
CMRR at 1 kHz
Typically -80 dB
Mains connection
Standard IEC receptacle
Audio Output
Physical
Type XLR, 1/4" TRS, transformer balanced
Dimensions (HxWxD)
88 x 483 x 158 mm (3.5 x 19 x 6.2")
Impedance 70 Ω, balanced and unbalanced
Weight
2.9 kg (6.4 lbs)
Maximum output level
+18 dBu, balanced and unbalanced
System Specifications
Frequency response
10 Hz to 20 kHz, ±1 dB
Noise at unity gain
-87 dBu, unweighted, 20 Hz to 20 kHz
THD at unity gain 0 dBu input level
Typically <0.1% 20 Hz to 20 kHz
Compressor
Attack time
Typically 10 ms
Release time
Typically 50 ms for 50% release,
up to 5 s for full release
Maximum output gain
+30 dB
Maximum peak reduction
-30 dB
Tube types
2x 12AX7, 1x 12BH7, 1x EL84
Meter settings
Gain Reduction, +4 output, +10 output
6 of 9
Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
Architecture & Engineering Specifications
The KT-2A leveling amplifier shall provide a single channel vacuum tube compressor/limiter with optical attenuator in a standard
2U 19" rack mount chassis.
The KT-2A shall provide an output gain control which can provide make up gain.
The KT-2A shall provide a peak reduction control which sets the compressor threshold.
The KT-2A shall provide a three position VU meter mode rotary switch with setting of +4 dBu, +8 dBu and gain reduction
The KT-2A shall be fitted with an illuminated VU meter that can read either output level or gain reduction:
The KT-2A shall provide a toggle switch to select limiting or compression modes.
The KT-2A shall provide a mains power on/off toggle switch with a separate illuminated power on indicator.
The KT-2A shall provide a pre-emphasis trimmer which adjusts the compressors sensitivity to high frequency signals.
The KT-2A shall provide transformer balanced audio input and output 3 pin XLR connectors and parallel TRS jack connectors.
The KT-2A shall provide a stereo link TRS jack connector to enable two KT-2A units to function as a stereo pair, by means of side chain linking.
The KT-2A shall provide a rear panel stereo link trimmer to enable attenuation matching of a stereo pair of KT-2A units.
The KT-2A shall provide a rear panel meter trimmer to calibrate the VU meter.
The KT-2A shall be fitted with an internal switch mode power supply, capable of operation at AC voltages ranging from 100 to 240 VAC, at 50/60Hz.
The mains connector shall be a standard IEC receptacle.
The KT-2A dimensions shall be 88 mm high x 483 mm wide x 158 mm deep (3.5 x 19 x 6.2"). The nominal weight shall be 2.9 kg (6.4 lbs).
The Leveling amplifier shall be the KLARK TEKNIK model KT-2A and no other alternative shall be acceptable.
7 of 9
Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
8 of 9
Product Information Document
Compressors/Limiters
KT-2A
Classic Leveling Amplifier with
Vacuum Tubes, Optical Attenuator
and MIDAS Transformers
For service, support or more information contact the KLARK TEKNIK location nearest you:
Europe
MUSIC Group Services UK
Tel: +44 1562 547 100
Email: CARE@music-group.com
USA/Canada
MUSIC Group Services NV Inc.
Tel: +1 702 963 1300
Email: CARE@music-group.com
Japan
MUSIC Group Services JP K.K.
Tel: +81 3 5833 9121
Email: CARE@music-group.com
MUSIC Group accepts no liability for any loss which may be suffered by any person who relies either wholly or in part upon any description, photograph, or statement contained herein.
Technical specifications, appearances and other information are subject to change without notice. All trademarks are the property of their respective owners. MIDAS, KLARK TEKNIK,
LAB GRUPPEN, LAKE, TANNOY, TURBOSOUND, TC ELECTRONIC, TC HELICON, BEHRINGER, BUGERA, COOLAUDIO and EUROCOM are trademarks or registered trademarks of
MUSIC Group IP Ltd. © MUSIC Group IP Ltd. 2017 All rights reserved.
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