User Manual

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Enhanced Proportional-Q Response
KLARK TEKNIK’s enhanced Proportional-Q equalisation oers 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 eectively. At the same time,
theenhanced Proportional-Q equalisation response used on DN370 minimises interaction between
adjacent frequency bands, allowing subtle tonal correction without frequency response ripple,
sothat 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
viewingangles.
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 20kHz.
The notch lters allow the surgical removal of resonances and feedback with minimal eect 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.
Product Information Document
Dual 30 Band, 1/3 Octave Analogue Graphic
Equaliser with Enhanced Proportional-Q
Response and Four-Band Filtering
Equalizers
DN370