Klark Teknik KT-2A with a T4BLA Optical cell upgrade. I’ve owned this unit since new and upgraded the cell shortly after purchasing it making it a very good sounding unit with both my ISA and Neve preamps driving it. I’ve managed to produce many great vocal and bass guitar mixes with it! The unit itself is in great working and visual condition with out and rack rash or scratches. It also comes in its original box with instructions and un opened power cable.