MICROPHONE PREVIOUS 4-channel preamp. Four transformer-based ISA preamps: Over the past two decades, ISA series mic preamps have been chosen by the world's best producers. Optional 8-channel A/D converter: Four A/D converter inputs provide eight channels of high-quality conversion, with a dynamic range of 122 dB and a jitter value of less than 250 picoseconds. Selectable impedance: Ideal for matching the system to the impedance of different microphones or for experimenting with creative applications. Impedance settings include the original 'Vintage ISA110' setting, which gives you the famous 'Focusrite sound'. Four front panel instrument inputs: Instantly accessible from the front panel, without the need for DI boxes. Dedicated analog insert points: All channels have switchable insert points, thus allowing routing (between pre and output) through external processors. Precision LED meters on each channel: clear metering, designed to capture even the fastest, most elusive transients.