Page 1
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Enhanced Proportional-Q
equalisation provides both smooth
contouring EQ and High-Q notches
Swept high-pass and low-pass
lters per channel with illuminated
LED rings
Two overlapping high-precision
swept notch lters per channel with
illuminated LED rings
Channel bypass and graphic EQ
range selection switches
Long-throw 45 mm oil-damped
faders with dust covers for increased
accuracy and reliability
Power-o bypass relays with
recessed power switch to avoid
accidental operation
Electronically balanced inputs
and outputs on Neutrik* XLR and
Phoenix* connectors
Rugged 3U rackmount chassis for
durability in portable applications
Auto-ranging universal switch-mode
power supply
10-Year Warranty Program*
Designed and engineered in the U.K.
The DN370 is the latest evolutionary
step in a process of design
renement that goes back over
40years to the earliest KLARKTEKNIK
graphic equalisers. The enhanced
Proportional-Q response recaptures
that of the classic single channel
DN27 graphic equaliser using
modern solid-state design and
manufacturing technologies, and the
DN370 features dual channel 30 band
graphic equalisation with swept high-pass and low-pass lters and two
swept notch lters per channel. This highly exible tool box of corrective
equalisation and ltering is ideal for both Front of House and stage
monitoring applications, where both the gentle contouring and surgically
precise high-Q notches uniquely made possible by the Proportional-Q
response enhance intelligibility as well as eliminating sub-sonic rumble,
room and speaker resonances and standing waves. DN370 is designed for
system installers as well, and features Phoenix-style connectors for ease
ofinstallation.
*All third-pa rty tradema rks are the prop erty of their re spective
owners. T heir use neither c onstitutes a claim o f the trademark no r
aliation o f the trademark ow ners with MUSIC Gro up. Product name s
are mention ed solely as a ref erence for compati bility, eect s and/or
componen ts. Warranty de tails can be found at m usic-group.com.
Page 2
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Enhanced Proportional-Q Response
KLARK TEKNIK’s enhanced Proportional-Q equalisation oers key advantages over the more
numerous Constant-Q graphic equalisers on the market. A Constant-Q response boosts or cuts an
increasingly wide band of frequencies, resulting in more of the frequency spectrum being lost when
using a Constant-Q equaliser to eliminate problem frequencies. If the response of a Constant-Q
equaliser is made narrower to compensate, the result is ripple in the frequency response when small
amounts of boost and cut are applied.
In contrast, with a Proportional-Q response, at low amounts of cut or boost the width of the
lter is relatively broad allowing for gentle contouring of the frequency spectrum, but becomes
progressively narrower as the amount of boost or cut is increased, giving a more ‘focused’ response
ensuring that problem frequencies can be attenuated quickly and eectively. At the same time,
theenhanced Proportional-Q equalisation response used on DN370 minimises interaction between
adjacent frequency bands, allowing subtle tonal correction without frequency response ripple,
sothat more of the musical content is preserved.
Comprehensive Filter Control
DN370 augments the Proportional-Q graphic equalisation section with a comprehensive set of
continuously swept lters for precise corrective control of the audio spectrum. The control knobs
incorporate a push function to switch the lter in and out whilst maintaining the frequency setting,
and feature illuminated LED rings for ‘at a glance’ status display, even at wide distances and
viewingangles.
The 12 dB/oct high-pass lter features a 20 Hz to 500 Hz range and is invaluable for the smooth
rejection of unwanted low and subsonic frequencies, particularly relevant for use with modern
compact wedge monitors. The 12 dB/oct low-pass lter features a 2 kHz to 20 kHz range and can
be used to improve intelligibility by tailoring the upper frequency response to match that of the
monitor speaker.
The two notch lters feature overlapping frequency ranges of 20 Hz to 2 kHz and 200 Hz to 20kHz.
The notch lters allow the surgical removal of resonances and feedback with minimal eect on the
rest of the program material, and fast control of ‘between fader’ frequencies. The ability to overlap the
notch lters, both with each other and with the graphic equaliser bands, allows very deep notches
to be created. Up to 45 dB of attenuation is possible when using the notch lters in conjunction with
the graphic equaliser bands.
A channel gain control is provided with range from -∞ to +6 dB. In the event of sudden on-stage
feedback, this control can be used to immediately mute the signal path whilst the cause
is established.
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Page 3
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
High Resolution Faders
The DN370 graphic equaliser section features centre-detented long-throw 45 mm precision
oil-damped faders which allow a high degree of control over the ±12 dB range, and a ±6 dB range
is also provided for increased resolution for even ner control of the audio frequency spectrum
response. Channel bypass and graphic equaliser range selection switches are also provided for easy
conguration and comparison of the graphic equaliser setting with the direct signal. The faders also
feature protective covers to inhibit the ingress of dirt and dust, to maximise their working life in
demanding environments.
Electronically-Balanced Inputs and Outputs
DN370 has electronically-balanced inputs with excellent common-mode rejection and the electronic
servo-balanced outputs have high-drive capability to cope with long cable runs. Although equalisers
are more generally used on console inserts, the DN370 is fully capable of being used in-line with
cables running the long distances between the Front of House mix position, the main stage and the
delay towers in festival PA systems. Power-o bypass relays preserve the signal path in the event of a
power failure, and the recessed front panel power switch is designed to avoid accidental operation.
Transformer balancing is available as an additional option on both the inputs and outputs.
Built for the Road
Featuring a rugged steel 3U rackmount enclosure, the DN370 is designed for the rigours of live
concert touring. Premium Neutrik connectors are used to ensure reliable audio connections,
night after night.
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Page 4
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Auto-Ranging Universal Switch-Mode Power Supply
DN370 features a universal power supply, which is auto-voltage sensing for use on a worldwidebasis.
You Are Covered
We always strive to provide the best possible Customer Experience. Our products are made in our
own MUSIC Tribe factory using state-of-the-art automation, enhanced production workows 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 condently back it up with a
generous Warranty program.
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Page 5
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Dimensions
11.2 mm [0.44 in]203 mm [8.0 in]14.1 mm [0.55 in]
435 mm [17.1 in]
133 mm [5.2 in]
CL
TOP
483 mm [19.0 in]
CL
228 mm [9.0 in]
SIDE
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Page 6
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Technical Specications
Inputs
Electronically balanced (pin 2 hot)
Typ e
Impedance
Maximum input level
20 k
+22 dBu
Outputs
Electronically balanced (pin 2 hot)
Typ e
Minimum load impedance
Source impedance
Maximum output level
600
<60
+22 dBu into >2 k
Performance
Frequency response
relative to signal at 1 kHz
±0.5 dBu
EQ out
EQ in (flat)
Distortion (THD+N)
Dynamic range
Overload indicator
Gain control
Equalisation
Centre frequencies
±0.5 dBu 20 Hz - 20 kHz
±0.5 dBu
< 0.003% @ 1 kHz +4 dBu
>114 dB
(20 Hz - 20 kHz unweighted, ±12 dB range)
+20 dBu
-∞ to +6 dBu
30 Bands
To BS EN ISO 266:1997 25 Hz-20 kHz,
⁄ oc tave tolerance ±5%
Maximum boost/cut
High pass filter slope
Low pass filter slope
Notch filter attenuation
Notch filter response
±12 dB, ±6 dB
12 dB/octave
12 dB/octave
>17 dB
Q=32
Terminations
3-pin XLR and 6-pin Phoenix-style
Audio
3-pin IEC
Power
Power Requirements
Voltage
Consumption
100 to 240 VAC, 50 to 60 Hz
<60 W
Dimensions
Width
Depth
Height
483 mm (19.0")
228 mm (9.0")
133 mm (5.2")
Weight
Net
5.8 kg (12.8 lbs)
Options
Input and output balancing transformers
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Page 7
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Architecture & Engineering Specications
The graphic equaliser shall provide the function of graphic equalisation for each of two channels with a proportional-Q response with ±12dB of
boost and cut at 30 1/3 octave centre frequencies from 25 Hz - 20 kHz to BS EN ISO 266:1997, and shall provide an alternative ±6 dB range for
increased fader resolution with an associated range switch for each channel. A graphic equalisation section bypass switch shall also be provided
for each channel.
The graphic equaliser shall use centre-detented slide potentiometers with 45 mm travel arranged to give a graphical display of frequency
plotted against level. The slide potentiometers shall have protective covers to inhibit the ingress of dirt and dust.
The graphic equaliser shall have one second order (12 dB/oct) high-pass lter per channel with adjustable frequency range 20 Hz to 500 Hz.
The graphic equaliser shall have one second-order (12 dB/oct) low-pass lter per channel with adjustable frequency range 2 kHz to 20 kHz.
The graphic equaliser shall have two notch lters per channel, with overlapping adjustable frequency ranges.
The graphic equaliser low-pass, high-pass and notch lters shall each have a rotary control knob with a latching push switch action and an
illuminating LED ring to indicate the active condition.
The graphic equaliser shall have a channel gain control with range from -∞ to +6 dB per channel.
The graphic equaliser shall have a power-o bypass facility, which shall allow it to return automatically to the bypass condition in the event of
power supply interruption.
The graphic equaliser shall have a recessed front panel power switch designed to avoid accidental operation.
The graphic equaliser shall feature 2 line-level electronically-balanced inputs and 2 line-level electronically-balanced outputs on industrystandard XLR connectors and Phoenix-style connectors.
The graphic equaliser shall have the option of audio balancing transformers on both the inputs and outputs.
The graphic equaliser shall include an auto-ranging universal switch-mode power supply for use on a worldwide basis.
The graphic equaliser shall be housed in a standard 3U 19" rackmount chassis, and shall be 483 mm wide x 228 mm deep x 133 mm high
(19.0" x 9.0" x 5.2"), with nominal weight 5.8 kg (12.8 lbs). The graphic equaliser shall be installed in a rack frame or road case capable of safely
supporting its weight. Input, output, and power connections shall be made at the rear panel of the graphic equaliser. Installers shall allow
adequate space at the rear for connection and disconnection of input, output, and power connections. The power requirements shall be 100 to
240 VAC, 50 to 60 Hz.
The graphic equaliser shall be the KLARK TEKNIK DN370 and no other alternative shall be acceptable.
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Page 8
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
8 of 9
Page 9
Product Information Document
Equalizers
DN370
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
For service, support or more information contact the KLARK TEKNIK location nearest you:
Europe
MUSIC Tribe Brands UK Ltd.
Tel: +44156 273 2290
Email: CARECrea@music-group.com
CAREEnte@music-group.com
CARELife@music-group.com
MUSIC Tribe ac cepts no liabilit y for any loss which may b e suered by any per son who relies ei ther wholly or in pa rt upon any descr iption, photog raph, or stateme nt contained her ein.
Technical spe cications, ap pearances and oth er information ar e subject to chang e without notice. A ll trademarks a re the propert y of their respe ctive owners. MIDAS, K LARK TEK NIK,
LAB GRUPPEN, LAKE, TANNOY, TURBOSOUND, TC ELECTRONIC, TC HELICON, BEHRINGER, BUGERA and CO OLAUDIO are trad emarks or regi stered tradema rks of MUSIC Group IP Ltd .
© MUSIC Group IP Ltd . 2018 All rights reserve d.
USA/Canada
MUSIC Tribe Commercial NV Inc.
Tel: +1 702 800 8290
Email: CARECrea@music-group.com
CAREEnte@music-group.com
CARELife@music-group.com
Japan
MUSIC Tribe Services JP K.K.
Tel: +81 3 6231 0453
Email: CARECrea@music-group.com
CAREEnte@music-group.com
CARELife@music-group.com
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