You May Only Need a Couple of Mic Preamps–but They Should Be the Best
ISA Two is part of Focusrite’s classic lineage of no-compromise microphone preamps. The original ISA modules, commissioned by Sir George Martin, are time-honored and coveted by engineers the world over. Literally hundreds of hit recordings have been made with Focusrite’s ISA range–a legacy that continues today.
Two Legendary Mic Pres
Focusrite’s ISA Two comprises a totally independent pair of legendary ISA microphone preamps based on the original ISA 110 module. It combines the best of traditional solid-state electronics with the original input transformer–the Lundahl LL1538. Two is a nice round number, ideal for recording, say, a vocal and an instrument, or a stereo piano. But though you may only need two mic pres, you owe it to your craft to choose the best.
Lundahl LL1538 Mic Input Transformer
ISA Two uses the famed Lundahl LL1538 input transformer, the same design used on the original ISA 110. To this day the Lundahl transformer remains the best microphone input transformer available, and is used in every ISA Series mic pre.
Up to 80 dB of Gain
ISA Two offers up to 80 dB of clean, distortion-free gain. The much heralded ISA topology also ensures low noise, even at the highest gain levels. The transformer alone supplies 20 dB of gain, while ISA’s input stage offers up to 60 dB in addition, giving an astonishing 80 dB of maximum gain on the microphone input.
Variable Input Impedance
Four choices of input impedance, including the original ISA 100 value, allow you to match the preamp to your microphone, even if it’s a vintage type, giving you the best possible sound. The impedance is selected using a switch on the front panel, and the impedance choice is remembered even once the unit is switched off and back on
Each channel has an eight-LED array to clearly display the level of your two signals. Line up your ISA Two levels to match your DAW converters with the calibration knob on the rear panel.
Front Panel Instrument and Rear Panel Line Inputs
Two 1/4-inch jack sockets on the front panel of ISA Two give you instant access to a transparent DI input. TRS line inputs are available on the rear panel too, and you can step through them instantly to select the one you want.
Variable Cut-Off High-Pass Filter
ISA Two features an extremely smooth sounding 18dB/octave high-pass filter of the same design as the original ISA 110 module–with a range of 16 to 420 Hz. This is ideal for cutting out unwanted low-frequency sounds.
Rear Panel Balanced Inserts
Each channel has its own balanced insert point. With 1/4-inch TRS send and receive connections, your choice of signal processor can be connected and switched in and out using the illuminated switch on the front panel.