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Focusrite Pro ISA 430 MkII
Channel Strip with Microphone Preamplifier, Compressor and EQ


The Focusrite ISA 430 MkII represents the pinnacle of Focusrite's analogue channel strip technology...
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Focusrite Pro ISA 430 MkII
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The Focusrite 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 flavors, alongside unmatched internal routing and connectivity, the ISA 430 MkII enables today's recording professionals to enjoy the unique sonic contribution of these heritage designs within one extremely versatile processor. With the Producer Pack, Focusrite's iconic status as the leading manufacturer of channel strips remains unrivalled.

From mic impedance switching and 'mic air' effect (a wire-wound inductor for increased spaciousness), to three compressor options (VCA, Vintage Opto and Opto Limit) combined with the compressed/uncompressed 'Blend' feature, the ISA 430 MkII delivers an impressive variety of processing sounds.

Routing and monitoring flexibility has also received a booster. The unique 'Listen' feature (allowing you to hone in on the frequency you wish to affect) is now available on compressor, gate, and expander circuits as well as the ISA 430 MkII's unique phase cancellation-based de-esser circuit. In addition, monitoring and inserts are available at a variety of points along the signal chain. Finally, the ISA 430 MkII features an optional 24-bit 192kHz high performance (122dB A-weighted with jitter below 20 pico seconds) stereo A-D converter, allowing you to retain every nuance of your analogue signal as you flow seamlessly into the digital domain.

Focusrite ISA 430 MkII Features:

  • ISA-series transformer-based preamp:  Featuring mic impedance switching and unique 'mic air' effect (a wire-wound inductor forincreased spaciousness)
  • Dual topology compressor:  The ISA 430 MkII is the first ISA to feature both the classic transparent VCA circuit, and a vintage optical circuit with both soft compression and crunch settings.
  • Unmatched flexibility:  The ISA 430 MkII features an incredible variety of insert points and variable signal path arrangements. It can operate as four independent modules.
  • Precision VU metering at multiple points:  Including 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 with two additional shelving positions.
  • Gate and Expander:  Proprietary Focusrite discrete Class A VCA Gate and Expander designs, now both featuring a 'Listen' option for precision control.
  • De-esser featuring 'De-ess Listen':  A combination of EQ and phase cancellation are used to create a smoother and less obtrusive result.
  • Optional Stereo 192kHz ADC:  Embodies cutting-edge conversion technology, incorporating Focusrite analog circuitry to deliver A/D conversion of the highest quality (128dB dynamic range).

Focusrite ISA 430 MkII Specifications:

  • Line:
    • Gain Range:  +10 to +40dB continuously variable
    • Input Impedance:  >1M ohm
  • Mic:
    • Gain Range:  0 to +60dB in 10dB steps
    • Input Impedance:  Variable as follows: 600 ohms, 1.4 kOhm, 2.4 kOhm, 6.8 kOhm
    • EIN:  -128dB with 150 ohm terminating impedance at 60dB of gain
    • Noise:  -97dBu
    • THD:  0.001% with -20dBu 1 kHz 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:  100┬Ás 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
  • EQ:
    • Low Pass Filter:  18dB/oct from 400 Hz - 22 kHz
    • High Pass Filter:  18dB/oct from 20 Hz - 1.6 kHz
    • Parametric section is comprised of: Low-mid & Hi-mid parametric, each with continuously variable boost/cut with center detent, frequency sweep control with two ranges, and fully variable Q. Low-mid frequencies 40 Hz to 400 Hz (120 Hz to 1.2 kHz when x3 is pressed). Hi-mid frequencies 600Hz to 6kHz (1.8 kHz to 18 kHz when x3 is pressed)
    • Shelving section is comprised of: High Frequency Shelf: The frequency range steps are 1.5 kHz, 3.3 kHz, 6.8 kHz and 15 kHz (2.2 kHz, 4.7 kHz, 10 kHz and 18 kHz when Hi Range is engaged). Low Frequency Shelf: The frequency range steps are 20 Hz, 56 Hz, 160 Hz and 460 Hz (33 Hz, 95 Hz, 270 Hz and 655 Hz when Hi Range switch is engaged) 
  • Gate:
    • 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
  • De-Esser:
    • Threshold Range:  22dB
    • Frequency Range:  2 kHz - 9 kHz
    • Ratio at Center Frequency:  2:1
  • Limiter:
    • Threshold Range:  20dBu
    • Ratio:  infinite (Brick Wall)
    • Attack:  Frequency Dependent
  • Weight:  16.7 lbs
  • Dimensions (W x H x D):  19" x 3.5" x 9.8"

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