Focusrite ISA Two - Microphone PreampDual MonoTransformer Based Microphone InputsVariable Input ImpedanceFront Panel Instrument InputsRear Panel Line InputsPer Channel Insert PointsPer Channel High-Pass FiltersPhantom PowerPhase Reverse SwitchesUser-Calibrated MeteringOverviewThe ISA Two from Focusrite is a dual mono microphone preamp featuring transformer based microphone inputs with variable input impedance. Based on the legendary designs found in the Focusrite Forte and Studio consoles, the preamps provides up to 80 dB of gain, while two front panel instrument inputs allow for immediate access to two transparent DIs.
The microphone inputs feature a pair of Lundahl LL1538 transformers with a 3-section winding that results in very low leakage inductance, along with an extended frequency response. To shield them from stray magnetism, each is encapsulated in mu-metal cans. Each channel has a fully-balanced insert point, activated using a front-panel button, making it easy to insert a choice of outboard EQ, a compressor, or limiter.
Microphone Input TransformerIncludes Lundahl LL1538 input transformers, originally chosen by Rupert Neve for the ISA 110 and one of the best microphone input transformers availableZobel network in the ISA circuit (perfected by Rupert Neve) allows the microphone preamp to maintain an extremely flat frequency response across a very wide bandwidth
GainOffers up to 80 dB of clean, distortion-free gainISA topology ensures low-noise even at the highest gain levelsThe transformer supplies 20 dB of gain, while the ISA's input stage offers up to 60 dB of additional gain on the microphone input
Variable Input ImpedanceFour choices of input impedance, including the original ISA 110 value, allow for matching the preamp to a different microphones, even a vintage type, for the best possible soundImpedance is selected using a switch on the front panelImpedance choice is remembered even when the unit is switched off and back on
User-Calibrated MeteringEach channel has an eight-LED array to clearly display the level of the two signalsLine up the analog levels with digital converters or a DAW by using the calibration knob on the rear panelCalibration avoids clipping on input
Instrument and Line InputsTwo 1/4" TS connectors on the front panel provide access to a transparent DI inputTRS line inputs are available on the rear panel and a front panel switch allows for stepping through them to instantly select required input
Variable High-Pass FilterSmooth-sounding, built-in 18 dB/octave high-pass filter per channelSame design as the original ISA 110 moduleIdeal for cutting out rumble, thumps and other unwanted low-frequency sounds using the 16 Hz to 420 Hz rangeEasily accessed with a large knob and illuminated button
Balanced InsertsEach channel has its own balanced insert point via 1/4" TRS send and receive connectorsAllows for a choice of signal processor to be connected and switched in and out using the illuminated switch on the front panel
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