Focusrite ISA 828 MKII High Grade Mic PreampDescription Sharing the simple mic preamp design of the original Focusrite ISA 110 module from the Focusrite Studio Console, ISA 828 MKII incorporates eight of Focusrite's classic mic preamps, with Lundahl LL1538 transformers on every input. Each channel has the option of mic or line inputs, while inputs 1 4 also feature instrument inputs on the front panel. Each mic pre has variable input impedance, to provide a range of subtly different sonic