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Focusrite ISA TWO - 2 Channel Preamp

£838.99 £699.16 (ex. vat)




Focusrite ISA TWO Preamp

  • Focusrite ISA TWO Preamp
  • Focusrite ISA TWO Preamp
  • Focusrite ISA TWO Preamp Rear

Focusrite ISA Two Dual Channel Mono Mic Preamp

The Focusrite ISA Two Dual Channel Mono Mic Pre offers two independent channels of premium Focusrite mic preamp heritage sporting line in and instrument front panel inputs; eliminating the need for DI boxes. As its built FROM the classic Focusrite ISA 110 ethos, the ISA Two features four impedance settings, including the classic ISA 110 setting, that lets you blend between a clean transparent signal or bringing out the character of your favourite mic.Plus, with an 80dB range of low noise gain, the ISA Two can perform under any stressful setting, offering a stable platform to let your mics shine. Additionally, rear accessed TRS sockets allow you to plug in your outboard gear, be it a compressor, EQ or limiter.   

Each channel's high-pass filter has a variable cut-off frequency of 16 to 420 Hz selected from the front panel and has an attenuation of 18 dB/Octave - the same design as used in the ISA110 module introduced during the 80's. The high pass filter, phase-invert, insert point and phantom power can all be switched in and out per channel using front panel controls.

Eight-segment LED arrays provide clear metering of both signals, and a calibration knob on the rear panel allows lining up of analogue signal levels to prevent clipping and optimize your signal path to any DAW or recording system.

Focusrite ISA Two Features 

  • Transformer-based mic preamplifiers
  • Variable input impedance
  • Up to 80 dB of clean, low-noise gain
  • Variable cut-off high-pass filter
  • Eight-segment user-calibrated LED meter per channel
  • Two front panel instrument inputs
  • Dedicated per-channel insert point
  • 1U 19" rack-mount format

Focusrite ISA Two Specifications 

Front and Rear Pannel 

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

  • 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: 0 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)

General

  • Weight and Dimensions: W x D x H =  480 mm x 280 mm x 44 mm
  • Weight: 3.7 kg
Manufacturer Focusrite
SKU SFOCISATWO
Model ISATWO
GTIN 0815301005148
Focusrite
Focusrite
ISATWO
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