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Focusrite ISA 430 MKII Producer PK Microphone Preamp

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  • Focusrite ISA 430 MKII Producer PK
  • Focusrite ISA 430 MKII Producer PK


Key Features

The Most Versatile Channel Strip

The ISA 430 MkII features Focusrite's ultimate heritage sonic signature including transformer-based mic pre, versatile EQ with two dual-range parametrics, compressor with both transparent VCA and vintage optical circuitry, expander/gate, phase-cancellation de-esser and optional 192kHz/24-bit 2-channel AD conversion.

Full Control Over Dynamics

The mic pre suits almost all mics including vintage and 'difficult' models such as ribbons. Variable impedance can be set for transparency or to highlight special features of the mic, such as presence bumps and rolloffs. Switchable additional inductance adds "air" without EQ.

Four Units in One, Independently Accessible

Use the mic pre, EQ, Dynamics and A-D converter independently, or route them to build powerful simultaneous processors. Re-order different sections to create multiple alternative signal paths.

Powerful Processing Options

Insert HPF, LPF and EQ into the Dynamics sections for frequency-sensitive processing - Listen function lets you audition the side-chain to fine-tune the effect.

Control Over Dynamics

Expander/gate features "hysteresis" setting to avoid chattering on difficult signals. De-esser is based on phase cancellation at the chosen frequency, for more natural sound.

Lundahl LL1538 Input transformer

The original mic transformers used in the original Red modules help to provide the unique sound and performance of this groundbreaking design.

Backlit VU Meter with Variable Calibration

ISA 430MkII has a moving coil VU meter with variable calibration to suit analogue and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert.



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 100s to 100ms
Release 100ms to 7s, variable or auto (program dependent)

Compressor (Vintage Opto mode)

Threshold Range -28dB to +12dB
Slope Soft knee in Comp mode, Hard knee in Lim mode
Attack Fixed
Release Fixed


Low Pass Filter 18dB/oct from 400Hz to 22kHz
Parametric Section Comprised of low-midHi-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 Comprised of: high frequency shelf, with frequency range steps of 1.5kHz, 3.3kHz, 6.8kHz and 15kHz (2.2kHz, 4.7kHz, 10kHz and 18kHz when Hi Range is engaged), and low frequency shelf, with frequency range steps of 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 20dB
Ratio Infinite (Brick Wall)
Attack Frequency Dependent

Optional A-D Converter Specs
Output formats (All channels)
AES/EBU (5V / 110 ohms), S/PDIF (0.8V / 75 ohms)
ADAT lightpipe (SMUX I/II/IV)
S/PDIF lightpipe

Bit depth

24 bits

AES3 output jitter

:500ps, 50Hz-100kHz
:400ps, 700Hz-100kHz

Frequency response

All ranges 20Hz20kHz0.3dB (50Hz16kHz0.1dB)
176.4kHz, 192kHz : 16Hz55kHz0.5dB


117.5dB A-weighted, audio band-limited, 1kHz, -60dB FS input
Maximum 0.004% at 1dB FS (1kHz)
Minimum 0.0008% at 13dB FS (1kHz)

Idle channel noise

113.5dB at 44.1kHz, CCIR-weighted, full bandwidth


109dB at 12kHz

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Warranty Information

See manufacturer's website for warranty information
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Additional Information

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