FocusriteISA Two Classic Dual Mono Transformer-Based Microphone Preamplifier

Product overview
About this model
The ISA Story goes back to 1985, when Sir George Martin commissioned legendary designer Rupert Neve to design new modules for the console at AIR Montserrat. They were so successful that more were commissioned for AIR London. These original modules form the basis of today's Focusrite ISA range—delivering the legendary Focusrite sound to leading studios, artists, producers and engineers around the world. Literally hundreds of hits have been made with the Focusrite ISA Range—and continue to be made today. Focusrite's ISA Two brings together a totally independent pair of legendary ISA microphone preamps inspired by the original ISA 110 module, combining the best of traditional solid-state electronics with the original input transformer specified by Rupert Neve—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. Focusrite has made one little adjustment to the mic pre. The original ISA 110 had a single-input impedance that was ideal for the mics of the time. In the ISA Two there are three more, allowing you to get the very best out of any microphone, vintage or modern. Give a vintage mic the input it expects to get a traditional, warm sound. Pair the ISA Two with modern microphones and get the most transparent sound imaginable. Or experiment and pull out the inner character of any microphone you care to try. Couple that with up to 80dB of gain and you can be ready for anything. In addition to the mic pres, there are front-panel instrument inputs for instant access, along with rear-panel line ins. There's also a balanced insert point on the rear panel, actuated with a front-panel button so you can insert the EQ, dynamics or other processors you need. Add to that the user-calibrated 8-LED metering and variable cutoff high-pass filter, and you know that with the ISA Two you'll have everything you need to get the highest-quality sound into your recordings. Now comes with Brainworx bx_console Focusrite plug-in This awesome plug-in recreates the analog signal paths of Focusrite’s revered ISA 110 and ISA 130 modules, which were a part of the Focusrite Studio Console. Designed and coded by the DSP geniuses at acclaimed software house Brainworx, the new bx_console Focusrite VST/AU/AAX plug-in for Mac and PC faithfully captures the sound, feel and styling of the original iconic hardware. If you purchased any Red, RedNet or ISA solution from January 2020 on, you will have the plug-in available in your Focusrite account as long as you’ve registered your product.

Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsSound
- Frequency Range
- Continuously variable from 16Hz to 420Hz (-3dB)
6 detailsConnections & power
- Input Impedance
- > 2 mohm
- Maximum Microphone Transformer Input Level
- +7 dBu with a THD+N < 0.7% at 1kHz measured at 0dB of gain with 150 ohm source impedance and 22Hz/22kHz band-pass filter
- Variable Input Impedance
- Low, ISA 110, Medium, High
- Ein Equivalent Input Noise
- Measured at 60dB of gain with 150 ohm source impedance and 22Hz–22kHz band pass filter = -127dB
- Maximum Output Level
- +24 dBu with a THD+N < 0.01% at 1kHz measured with 150 ohm source impedance and 22Hz/22kHz band-pass filter
- Input Selection
- Mic, Line, Instrument
2 detailsSize & weight
- Dimensions Wxhxd
- 18.90 inch x 1.73 inch x 11.02 inch (480 mm x 44 mm x 280 mm)
- Weight
- 8.16
6 detailsOther
- Signal to Noise Ratio
- Measured with 50 ohm source impedance and a 22Hz–22kHz band pass filter = 121dB relative to max output +24 dBu
- Total Harmonic Distortion Noise
- Measured with a 0 dBu input signal, +10dB of gain and a 22Hz–22kHz band pass filter = < 0.002% at 1kHz
- Gain Range
- +10dB to +40dB continuously variable trim
- Roll Off
- 18dB per octave (3-pole filter)
- Noise
- >Measured with 22Hz–22kHz band pass filter = Minimum gain (+10dB) = -95 dBu
- Crosstalk Channel to Channel
- Line input, with I/P = 0 dBu, gain = 0dB @ 1kHz input to channel A














