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Focusrite ISA430MKII
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Prices Price: 2099.00 € 1695,00 Price including VAT
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Focusrite ISA430MKII Professional Studio Microphone Preamp and Compressor

The ISA 430 MKII represents the pinnacle of Focusrite’s analogue channel strip technology, bringing together all the classic designs in one comprehensive production tool. Augmented with additional features and flavours, alongside unmatched internal routing and connectivity, the ISA 430 MKII enables today’s recording professional to enjoy the unique sonic contribution of these heritage designs within one extremely versatile processor. Focusrite’s iconic status as the leading manufacturer of channel strips remains unrivalled.

Main Features

Classic Focusrite transformer-based Mic-pre with variable impedance and ‘Air’ feature
Multi format Compressor; 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 4 separate modular processors: mic pre, EQ, Dynamics and stereo ADC
Precision VU metering of input level, Insert 1 or 2 Return level, Compressor gain reduction or Sidechain listen level (switched)
Classic Focusrite EQ design; an expanded version of the
original ISA 110
Post mic pre output for the shortest possible signal path
Proprietary Focusrite discrete Class A VCA Gate and Expander designs
‘Listen’ feature for precise control over compression, gating,
expansion and de-essing
De-esser design based on optical technology for lower distortion
and transparency
Soft Limiter to avoid critical digital overload
Optional Stereo A/D – 24-bit 192 kHz Delta Sigma converter

Question about the ISA430MKII Professional Studio Microphone Preamp and Compressor? email

Product Specifiations


Gain Range: +10dB to +40dB continuously variable
Input Impedance: >1M Ohm


Gain Range: 0 to +60dB in 10dB steps
Input Impedance: Variable as follows: 600 Ohm, 1k4 Ohm, 2k4 Ohm, 6k8 Ohm
EIN: -128dB with 150 Ohm terminating impedance at 60dB of gain
Noise: -97dBu
THD: 0.001% with -20dBu 1kHz input and 20Hz?22kHz bandpass filter

Compressor (VCA mode)

Threshold Range: -28dB to +12dB
Ratio: 1.5:1 to 10:1
Slope: Soft knee
Attack: 100µs to 100ms
Release: 100ms to 7s, variable or auto (program dependent)

Compressor (Vintage Opto mode)

Threshold Range: -28dB to +12dB
Ratio: 1.5:1 to 5:1 in Comp mode, 5:1 to 20:1 in Lim mode
Slope: Soft knee in Comp mode, Hard knee in Lim mode
Attack: Fixed
Release: Fixed


Low Pass Filter: 18dB/oct from 400Hz to 22kHz
High Pass Filter: 18dB/oct from 20Hz to 1k6Hz
Parametric section is comprised of: Low-mid & Hi-mid parametric, each with continuously variable boost/cut with centre detent, frequency sweep control with two ranges, and fully variable Q. Low-mid frequencies 40Hz to 400Hz (120Hz to 1k2Hz when x3 is pressed). Hi-mid frequencies 600Hz to 6kHz (1k8Hz to 18kHz when x3 is pressed)
Shelving section is comprised of: High Frequency Shelf: The frequency range steps are 1.5kHz, 3.3kHz, 6.8kHz and 15kHz (2.2kHz, 4.7kHz, 10kHz and 18kHz when Hi Range is engaged). Low Frequency Shelf: The frequency range steps are 20Hz, 56Hz, 160Hz and 460Hz (33Hz, 95Hz, 270Hz and 655Hz when Hi Range switch is engaged)


Threshold Range: -40dB to +10dB
Gate Range: 0 to -80dB
Attack: switched fast or slow
Release: 100ms to 5s
Hold: 20ms to 4s
Expander Ratio: 0 to 5:1


Threshold Range: 22dB
Frequency Range: 2k2 to 9k2
Ratio at centre frequency: 2:1


Threshold Range: 20dBu
Ratio: infinite (Brick Wall)
Attack: Frequency dependent

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