Product Detail Single Channel Original ISA Series Pre Amp in a robust portable metal Chassis Choose one of four carefully selected input impedances, including the original ISA 110 setting, to suit any microphone. Direct Instrument inputs including high and low impedance options to provide a comprehensive DI solution Dedicated insert point allows you to place extra processing between the pre-amp or D.I. and the optional converter . The "Focusrite ISA One Classic 1-Channel Microphone Pre-Amplifier" is best product for you. We recommended Focusrite ISA One Classic 1-Channel Microphone Pre-Amplifier