Focusrite ISA 430 MkII Channel Strip with Mic Preamp, Dynamics, Filtering, and Optional A-D Converter


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Focusrite's ISA 430 MkII is closely based on the original ISA 110 mic pre and subsequent ISA 130 dynamics sections originally design by Rupert Neve for George Martin's Neve console. The unit is a comprehensive channel strip comprising mic pre, filters, parametric EQ, shelving EQ, VCA/optical compressor/limiter, gate, de-esser and optional stereo A-D card. The equaliser itself features two separate parametric bands plus shelving low and high frequencies, high- and low-pass filters and the ability to switch individual EQ elements into the compressor side-chain. The four powerful processors that make up the ISA 430 MkII can all be used independently or patched into each other in a variety of ways for maximum versatility.

The dynamics section recalls the original Trevor Stride/Rupert Neve ISA 130 that dates back to 1987. It features a sophisticated expander/gate section as well as a versatile compressor. Both of these feature modern transparent VCA-based control elements for maximum compression without artifacts. The compressor also features the original vintage optical design for a truly traditional sound, and you can mix the original signal into the compressor output, maintaining dynamics as you take control. Like the other sections of the ISA 430 Mk II, there's a "Listen" button so you can hear exactly what each module is doing. Not only is the ISA 430 Mk II a powerful channel strip, combining heritage mic amps, equalization and dynamics; and optional superb-quality digital conversion, each element (and in the case of the equaliser, each section) can be used as a completely separate device for the ultimate in versatility.

Focusrite ISA 430 MkII Channel Strip Features:

  • Hugely versatile channel strip.
  • Classic ISA mic preamp design featuring Lundahl LL1538 input transformer.
  • Variable cut-off high-pass and low-pass filters.
  • Two-band parametric EQ.
  • Variable two-band shelving EQ.
  • VCA/Optical Compressor/Limiter.
  • De-esser.
  • Access individual processors through rear panel XLR connectors.
  • Custom reordering of processors.
  • Backlit VU meter with variable calibration.
  • Optional stereo A-D card with up to 192kHz, 24 bit sampling via AES3, S/PDIF or ADAT.

Focusrite ISA 430 MkII Specifications:

Gain Range: 10dB to 40dB continuously variable
Input Impedance: Variable as follows: 600 Ohm, 1k4 Ohm, 2k4 Ohm, 6k8 Ohm

Gain Range Mic: 0 to 60dB in 10dB steps
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
Input Impedence (Mic): Variable as follows: 600 Ohm, 1k4 Ohm, 2k4 Ohm, 6k8 Ohm

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

Compressor (Vintage Opto mode)
Threshold Range: -40dB to 10dB
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-mid

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

Threshold Range (De-esser): 22dB
Frequency Range (De-esser): 2k2 to 9k2
Ratio at centre frequency (De-esser): 2:1

Threshold Range (Limiter): 20dB
Ratio (Limiter): Infinite (Brick Wall)
Attack (Limiter): Frequency Dependent


484mm (W) x 85mm (H) x 250mm (D)
19" (W) x 3.5" (H) x 9.8" (D)

Each ISA 430 MkII Retail Box Includes:
(1) Focusrite ISA 430 MkII Channel Strip with Mic Preamp, Dynamics, Filtering, and Optional A-D Converter
(1) Printed User Guide in English, French and German

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