Focusrite ISA Two Stereo Mic Preamp  From Focusrite

An independent pair of ISA mic preamps from the ISA 110 module, featuring Lundahl LL1538 input transformers.

Focusrite

$859.00

Retail:  $1,124.99

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Focusrite // ISA Two recording Hudson Taylor with Joel Laslett Pott

In this video, we join Hudson Taylor in the recording of their track 'Beautiful Mistake' with Joel Laslett Pott at Perivale Studios, using the ISA Two for both guitar and vocals.Win a mix with Damian Taylor & Focusrite.Focusrite’s ISA Two brings together a totally independent pair of legendary ISA microphone preamps from 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.

  • Signal Chain
    • Focusrite ISA Two Stereo Mic Preamp

Manufacturer's Description from Focusrite

Two legendary mic pres

Focusrite’s ISA Two brings together a totally independent pair of legendary ISA microphone preamps from 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. (And if you need more, we offer ISA 428 Mk II 4-channel and ISA 828 8-channel units too.)

 

Variable input impedance

We’ve 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. We’ve added 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.

 

Front panel instrument inputs

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.

Focusrite

About Manufacturer

The Focusrite brand was established way back in 1985 and the founding principles of the company were to develop products that sounded more musical, in addition to just measuring well - today,we still carry these founding principles forward in our class-leading and award-winning designs. We measure our success by the success of you, our clients, and you will find Focusrite product prominent in professional and project studios throughout the world. Based just outside of London, we work with the best design talent throughout the world to bring you the tools to enhance the way you work. Our product is made with pride and principle in a highly automated ISO 9002 factory with significant level of test by engineers who themselves are musicians and understand the part our product plays in your process. Our commitment: We understand that how your project sounds to you is your most important concern. We are totally dedicated and focused on designing and manufacturing product that will enable you to achieve this goal. Our design goals are that product should be easy to use, logically designed, give class-leading performance and give years of predictable performance. We strive to continuously improve ourselves in these respects - our principal concern is meeting your expectations. Our focus on quality is all consuming - it rules our daily life.

Specifications

Front panel, per channel
  • 1/4" instrument input
  • Variable input impedance - Low, ISA 110, Medium, High
  • Input selection - Mic, Line, Instrument
  • 0 - 30 dB/30 - 60 dB gain switch
  • Phantom power switch
  • Phase invert switch
  • 0 - 60 dB gain in 10 dB steps
  • 0 - +20 dB continuously variable trim
  • Variable high-pass filter with on/off switch
  • Insert point on/off switch
  • Eight-LED user-calibrated level meters
  • Single power switch

Rear panel, per channel
  • XLR-F mic inputs
  • 1/4" TRS line inputs
  • 1/4" TRS Sends
  • 1/4" TRS Returns
  • XLR-M line output
  • Single peak meter calibration dial
  • Single IEC power socket

Maximum Input and Output Levels
  • Maximum Output Level: +24 dBu with a THD+N < 0.01% at 1kHz measured with 150 Ω source impedance and 22Hz/22kHz band-pass filter
  • Maximum Microphone Transformer Input Level: +7 dBu with a THD+N < 0.7% at 1kHz measured at 0 dB of gain with 150 Ω source impedance and 22Hz/22kHz band-pass filter

Mic Input Response
  • Gain range: 0 dB to +60 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim
  • Input Impedance: Switched Impedance setting (Equivalent Input Impedance at 1 kHz): 
 Low = 600 Ω
ISA 110 = 1.4 kΩ
Med = 2.4 kΩ
High = 6.8 kΩ
  • EIN (Equivalent Input Noise): Measured at 60 dB of gain with 150 Ω source impedance and 22 Hz-22 kHz band pass filter: -127 dB
  • Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter: -97 dBu
  • Signal-to-Noise Ratio: Measured with 150 Ω source impedance and 22 Hz-22 kHz band pass filter: 121 dB relative to max output +24 dBu
  • Total Harmonic Distortion + Noise: Measured with a -20 dBu input signal at +30 dB of gain and with a 22 Hz-22 kHz band pass filter: < 0.0007% at 1 kHz
  • Frequency Response: At minimum gain (0 dB): -0.5 dB at 10 Hz,
-1 dB at 135 kHz, relative to 1 kHz
  • At +60 dB gain: -6 dB at 10 Hz, -1 dB at 115 kHz, relative to 1 kHz
  • CMRR (Common Mode Rejection Ratio): -94 dB for mic input at 60 Hz for max. output = +24 dBu, -91 dB for mic input at 10 kHz for max. output = +24 dBu
  • Crosstalk Channel to Channel: Mic input, with I/P = 0 dBu, gain = 0 dB @ 1 kHz input to channel A, channel B output = -85 dB
 
Line Input Response
  • Gain range: -20 dB to +10 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim
  • Input Impedance: 10 kΩ from 10 Hz to 200 kHz
  • Noise at main output with gain at unity (0 dB) measured with 50 Ω source impedance and a 22Hz - 22 kHz band pass filter: -97 dBu
  • Signal-to-Noise Ratio: Measured with 50 Ω source impedance and a 22 Hz-22 kHz band pass filter: 121 dB relative to max output +24 dBu
  • Total Harmonic Distortion + Noise: Measured with a 0 dBu input signal, +10 dB of gain and a 22 Hz-22 kHz band pass filter: < 0.0002% at 1 kHz
  • Frequency Response: At minimum gain (0 dB): -0.3 dB at 10 Hz, -1 dB at 80 kHz, relative to 1 kHz
  • Crosstalk Channel to Channel: Line input, with I/P = 0 dBu, gain = 0dB @ 1 kHz input to channel A: Channel B output
= -91 dB

Instrument Input Response
 
  • Gain range: +10 dB to +40 dB continuously variable trim
  • Input Impedance: 2 MΩ
  • Noise: Measured with 22 Hz-22 kHz band pass filter: Minimum gain (+10 dB) = -95 dBu
  • Frequency Response: At minimum gain (+10 dB): -0.1 dB at 10 Hz,
-1 dB at 115 kHz, relative to 1 kHz
  • At maximum gain (+40 dB): -2.5 dB at 10 Hz, 
-1 dB at 110 kHz, relative to 1 kHz

High-Pass Filter
  • Roll-Off: 18 dB per octave (3 pole filter)
  • Frequency Range: Continuously variable from 16 Hz to 420 Hz (-3 dB)

Weight and Dimensions
  • W x D x H: 480 mm x 280 mm x 44 mm
  • Weight: 3.7 kg

Downloads

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Name

Description

ISA Two User Guide

Focusrite ISA Two User Guide

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