The DN370F is the latest evolutionary step in a process of design refinement that goes back over 40 years to the earliest KLARK TEKNIK 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 DN370F features dual channel 30 band graphic equalisation with swept high-pass and low-pass filters and two swept notch filters per channel. This highly flexible tool box of corrective equalisation and filtering 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. DN370F is designed for system installers as well, and features Phoenix-style connectors for ease of installation. DN370F features both transformer balanced audio inputs for enhanced common mode noise rejection and transformer balanced outputs with high-drive capability for full galvanic isolation.
Enhanced Proportional-Q Response
KLARK TEKNIK’s enhanced Proportional-Q equalisation offers 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 filter 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 effectively. At the same time, the enhanced Proportional-Q equalisation response used on DN370F minimises interaction between adjacent frequency bands, allowing subtle tonal correction without frequency response ripple, so that more of the musical content is preserved.