ISA One is a single-channel mic preamp boasting classic topology from Focusrite’s legendary ISA110 module, with a line input (XLR and TRS) and an independent D.I. channel for blending signals. It also offers dedicated gain control, active or passive impedance switch, a TRS output for routing to an amp and an independent XLR output on the rear.Other useful features include a variable impedance circuit that lets you switch between four input impedance settings, phantom power, phase reverse, a high pass filter, independent input metering and a headphone out with dedicated volume control. ISA series transformer-based pre-amplifier encased in a rugged and portable chassis Flexible independent D.I. channel Phantom power High pass filter Switchable impedance Rugged custom flight case Headphone output with volume control Dedicated insert point Dimensions (W x H x D): 8.66″ x 4.1″ x 11.4″ Mic input: XLR x 1 Line input: XLR x 1 and TRS x1 Instrument input TRS Jack: XLR x 1 External ADC input: TRS Jack x 1 Return: TRS Jack x 1 Send: TRS Jack x 1 Balanced line output: XLR x 1 DI output: XLR x 1 DI through: TS Jack x 1 Cue mix left input: TRS Jack x 1 Cue mix right input: TRS Jack x 1 Headphones output: 1/4″ TRS Jack x 1