Focusrite ISA 430 MKII Producer Pack


The ISA 430 MKII is a single input analog channel strip that brings together all of Focusrite's classic processor designs in one comprehensive production tool.

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The ISA 430 MKII is a single input analog channel strip that brings together all of Focusrite's classic processor designs in one comprehensive production tool. Apart from the microphone preamp, the unit is augmented with a compressor, limiter, EQ, de-esser and gate, alongside very comprehensive internal routing and connectivity.

The ISA 430 MKII enables today's recording professional to enjoy the unique sonic contribution of these heritage designs within a single, extremely versatile processor.

Classic Focusrite transformer-based Mic-pre with variable impedance and "Air" feature
Multi format compressor that switch between Focusrite's transparent VCA circuit and a vintage optical circuit
Unmatched flexibility with an incredible variety of insert points and variable signal path arrangements
Ability to function as three separate modular processors - microphone preamp, EQ and dynamics
Precision VU metering of input level, insert 1 or 2 return level, compressor gain reduction or sidechain listen level (switched)
Classic Focusrite EQ design based around an expanded version of the original ISA 110
Post microphone preamp output for the shortest possible signal path
"Listen" feature for precise control over compression, gating, expansion and de-essing
De-esser design based on optical technology for lower distortion and transparency


Number of Channels Single
Inputs 1 x XLR Microphone
1 x XLR Line
1 x 1/4" TS Phone Instrument
1 x XLR Compressor Return
1 x XLR EQ Return
1 x 1/4" TS Phone Compressor Key
1 x 1/4" TS Phone Gate Key
Outputs 1 x XLR Main
1 x XLR Post Pre
1 x XLR Compressor Send
1 x XLR EQ Send
1 x 1/4" TRS Phone Dynamic Link
Frequency Response Mic: -0.25dB down at 20Hz and -3dB down at 120kHz, minimum gain (0dB)
Line: -0.25dB down at 20Hz and -3dB down at 140kHz, unity gain (0dB)
Noise Mic: SNR relative to maximum headroom (28dBu) = 125dB
Line: SNR relative to maximum headroom (28dBu) = 119dB


Gain Range 0 to +60dB in 10dB steps
Maximum Output +26dBu
Input Impedance 600, 1400, 2400 and 6800 Ohms
Phantom Power +48V


Threshold Range -28dB to +12dB
Ratio Class A VCA Mode: 1.5:1 to 10:1
Vintage Opto Mode: 1.5:1 to 5:1 in Compressor mode, 5:1 to 20:1 in Limiter mode
Attack Time Class A VCA Mode: 100uS to 100mS
Vintage Opto Mode: Fixed
Release Time Class A VCA Mode: 100mS to 7S, variable or auto (program dependent)
Vintage Opto Mode: Fixed
Slope Class A VCA Mode: Soft knee
Vintage Opto Mode: Soft knee in Compressor mode, Hard knee in Limiter mode
Sidechain Yes


Filter Type Parametric, shelving, low- and high-pass
Frequency Bands Parametric
  • LMF: 40Hz to 400Hz
  • LMF (x3 in): 120Hz to 1200Hz
  • HMF: 600Hz to 6kHz
  • HMF (x3 in): 1.8kHz to 18kHz


  • LF: 20Hz, 56Hz, 160Hz, 460Hz
  • LF (Hi Range in): 33Hz, 95Hz, 270Hz, 655Hz
  • HF: 1.5kHz, 3.3kHz, 6.8kHz, 15kHz
  • HF (Hi Range in): 2.2kHz, 4.7kHz, 10kHz, 18kHz

Filters (18dB/Octave, 3rd Order)

  • LPF: 400Hz-22kHz
  • HPF: 20Hz-1.6kHz
Range (Boost/Cut) +/-18dB
Light Indication  
Threshold Range -6dBfs (+16dBu)
Ratio 1.5:1, 2:1 or infinite:1, level dependent
Attack Time Instant


Threshold Range 22dBu
Frequency Range 2.2kHz to 9.2kHz


Gate Threshold -40dB to +10dB
Gate Rate Attack: Switched fast or slow
Release: 100mS to 5S
Hold: 20mS to 4S


Dimensions (WxDxH) 19" x 9 7/8" x 3 1/2"
Weight 15.4 lbs
Specialties Dynamics and EQ sections can be used as two independent processors


Packaging Info
Package Weight 22.45 lb
Box Dimensions (LxWxH) 25.0 x 17.5 x 9.0"



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