The DN9344E Helix series digital equalizer from Klark Teknik is a single rack-space slave version of two complete DN9340E units. By packaging four channels of Helix processing into a compact form, the unit offers huge space efficiency, with a cost per channel lower than many other products. The DN9344E can be controlled from a master DN9340E unit, or by an external computer, and also has provision for contact closure operation.