Loading... Please wait...
  • 800-248-7540
  • My Account 


Focusrite ISA430-MKII Compressor and EQ Channel Strip with Microphone Preamp

Hover over image to zoom

  • Image 1
  • Image 2
See Other Items By:

23.90 LBS
Usually ships in 7-14 business days. Need it Fast? Call us
Free Shipping
Request Quote

 Product Description

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 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.


  • ISA-series transformer-based preamp
    Featuring mic impedance switching and unique 'mic air' effect (a wire-wound inductor for increased 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 analoguw circuitry to deliver A/D conversion of the highest quality (128dB dynamic range).
  • 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, 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
    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 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 center 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)
  • 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: 2k2 to 9k2
    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"
  •  Warranty Information

    Default 1 Year

     Find Similar Products by Category

     Product Reviews

    This product hasn't received any reviews yet. Be the first to review this product!

    You Recently Viewed...


    What's New

    Payments Accepted


    Secured by

    EV SSL Signifyd | Fraud Protection and Chargeback Prevention for eCommerce

    Copyright 2018 Spectrum Audio. 3301 Cline St. Houston, TX 77020. All Rights Reserved.

    Click the button below to add the Focusrite ISA430-MKII Compressor and EQ Channel Strip with Microphone Preamp to your wish list.