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Focusrite ISA Two

You may only need a couple of mic preamps, but they need to be the very best. The ISA Two dual-mono mic pre is the ideal solution: two independent channels of the highest quality classic Focusrite mic pres, with line in and front-panel instrument inputs – no DI box required. Based on the legendary designs found in the Focusrite Forte and Studio Consoles, ISA Two is the ideal front-end for your rack.

Superb sound spanning four different decades
Focusrite’s microphone preamplifiers go back to the original Focusrite ISA 110 modules, when Rupert Neve was commissioned by George Martin in 1985 to create a no-compromise channel strip for his Neve console. Combining the very best solid-state electronics with transformer coupling, Focusrite mic pres have played a key part in the recording of hundreds of hit records and they’re the choice of leading artists, producers and engineers around the world.

Lundahl Transformers
At the heart of the ISA Two is a pair of Lundahl LL1538 transformers. ISA products have relied on Lundahl from the beginning, since their components were originally specified in 1985. The LL1538 features a 3-section winding, resulting in very low leakage inductance and, as a result, an extended frequency response. They’re encapsulated in mu-metal cans to shield them from stray magnetism.

Variable input impedance and up to 80 dB of gain
ISA Two features two classic Focusrite mic preamps, with four impedance settings including the original ISA 110 setting. Variable input impedance allows you to go for an accurate, transparent sound or choose to highlight the character of your favourite vintage mic – and anywhere in between. With up to 80 dB of low-noise gain, ISA Two can perform in the most demanding situations - really bringing your ribbon, condenser or moving coil mics to life.

Insert your choice of processors
Each channel has a fully-balanced insert point accessed via TRS sockets on the rear panel and activated with a front-panel button, so it’s easy to use outboard processors with the ISA Two. Just plug in your choice of EQ, compressor or limiter.

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Focusrite ISA Two

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Focusrite ISA Two

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Product: Focu-isatwo

You may only need a couple of mic preamps, but they need to be the very best. The ISA Two dual-mono mic pre is the ideal solution: two independent channels of the highest quality classic Focusrite mic pres, with line in and front-panel instrument inputs – no DI box required. Based on the legendary designs found in the Focusrite Forte and Studio Consoles, ISA Two is the ideal front-end for your rack.

Superb sound spanning four different decades
Focusrite’s microphone preamplifiers go back to the original Focusrite ISA 110 modules, when Rupert Neve was commissioned by George Martin in 1985 to create a no-compromise channel strip for his Neve console. Combining the very best solid-state electronics with transformer coupling, Focusrite mic pres have played a key part in the recording of hundreds of hit records and they’re the choice of leading artists, producers and engineers around the world.

Lundahl Transformers
At the heart of the ISA Two is a pair of Lundahl LL1538 transformers. ISA products have relied on Lundahl from the beginning, since their components were originally specified in 1985. The LL1538 features a 3-section winding, resulting in very low leakage inductance and, as a result, an extended frequency response. They’re encapsulated in mu-metal cans to shield them from stray magnetism.

Variable input impedance and up to 80 dB of gain
ISA Two features two classic Focusrite mic preamps, with four impedance settings including the original ISA 110 setting. Variable input impedance allows you to go for an accurate, transparent sound or choose to highlight the character of your favourite vintage mic – and anywhere in between. With up to 80 dB of low-noise gain, ISA Two can perform in the most demanding situations - really bringing your ribbon, condenser or moving coil mics to life.

Insert your choice of processors
Each channel has a fully-balanced insert point accessed via TRS sockets on the rear panel and activated with a front-panel button, so it’s easy to use outboard processors with the ISA Two. Just plug in your choice of EQ, compressor or limiter.


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

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:Crosstalk Channel to Channel

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

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:< 0.002% at 1 kHz

Frequency Response

At unity 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
  • ISA Two
  • IEC Power cable
  • Printed User Guide in English, French and German

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