The Klark Teknik DN370 is a dual-channel 1/3 octave (30-band) rackmount graphic equalizer that is designed for the discerning professional who desires uncompromising design. The most important design decision for the DN370 was determining the equalizer response. Proportional-Q equalization, as used on previous Klark Teknik analog graphic equalizers, offers some key advantages over the numerous Symmetrical-Q equalizers on the market. Namely at low amounts of cut or boost, the width of the filter is relatively broad and becomes narrower as the amount of boost or cut is increased, giving a more 'focused' response. This differs from a Symmetrical-Q response, which boosts or cuts an increasingly wide band of frequencies, as more of the frequency spectrum is lost when using Symmetrical-Q.