Focusrite ISA 428 mkII
Focusrite ISA 428 mkII

Focusrite

Focusrite ISA 428 mkII

€1.884,00

Tax included. Shipping calculated at checkout

No reviews
No reviews
SKU: 52282
Quantity:
This item is available on a custom order basis only

Contact

Focusrite ISA 428 MkII — a 4-channel microphone preamp built around Lundahl LL1538 transformers, based on the classic ISA 110 design from Focusrite's 1980s consoles.

Built for studios chasing the transparent yet transformer-colored sound of the consoles designed for George Martin's AIR Studios. ISA 428 MkII carries a circuit topology unchanged for decades into a convenient 2U enclosure, adding switchable input impedance and optional digital conversion, making it equally useful as a standalone analog front end or paired with any digital interface.

Matching Impedance to the Microphone's Character

The original ISA preamp was designed around microphones available in the 1980s, limiting its versatility with modern capsules carrying different impedance characteristics. ISA 428 MkII solves this by adding three extra input impedance settings alongside the classic Vintage ISA 110 mode, letting an engineer deliberately choose the tonal character — from transformer-core warmth and saturation to clean, transparent signal transfer — depending on the microphone model and source material.

Expanding to a Full Digital Front End Without New Hardware

Studios bridging an analog preamp chain with a digital workflow need a flexible conversion path that doesn't force a separate converter purchase. The optional eight-channel A-D card fitted inside the ISA 428 MkII converts the signal with 122dB of dynamic range and jitter performance below 250 picoseconds, output over a D-Sub25 connector that interfaces directly with Pro Tools HD and other digital gear. That means a single 2U unit works as a purely analog preamp or a complete digital front end, whichever the session calls for.

KEY FEATURES

  • 4 channels of microphone preamp based on the original ISA 110 design
  • Lundahl LL1538 input transformer with a custom Zobel network
  • Switchable input impedance, including the classic Vintage ISA 110 mode
  • Gain up to +60dB in 10dB steps, plus continuously variable +20dB (up to 80dB total)
  • 4 front-panel instrument inputs (no separate DI box needed)
  • 4 line inputs and switchable insert points on every channel
  • Variable high-pass filter on every channel
  • 6-segment LED metering for accurate level monitoring
  • Optional eight-channel A-D card (122dB dynamic range, jitter below 250ps)
  • Includes the Brainworx bx_console Focusrite SC plugin

TECHNICAL SPECIFICATIONS

  • Channel count: 4
  • Frequency response (0dB gain, mic): -0.35dB at 20Hz, -3dB at 122kHz
  • Frequency response (60dB gain, mic): -2.5dB at 20Hz, -3dB at 103kHz
  • Gain range: 0 to +60dB in 10dB steps, plus 0 to +20dB continuously variable (up to 80dB total)
  • Input transformer: Lundahl LL1538
  • Inputs: mic, line, instrument (front panel)
  • Input impedance: switchable, 4 settings including Vintage ISA 110
  • Optional A-D card: 8 channels, 122dB dynamic range, jitter below 250ps, D-Sub25 connector
  • Chassis format: 2U rack

Returns

We want you to be sure of your choice and that the goods fit 100%.

For this reason, you have 30 days to test the product, during which you can return it without giving a reason.

It is important to keep the factory appearance of the goods, consumer properties and full equipment (original packaging, labels, manuals, software CDs, all inserts, everything that was included in the delivery).

If you have decided to return the goods, please write to us at return@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

Please note that refunds are not available for:

  • Cables and connectors
  • Software
  • Devices with a used voucher and serial numbers for which they were registered
  • Custom accessories (earbuds, earbuds)
  • Needles and cartridges
  • Care and hygiene products

Returns

We want you to be sure of your choice and that the goods fit 100%.

For this reason, you have 30 days to test the product, during which you can return it without giving a reason.

It is important to keep the factory appearance of the goods, consumer properties and full equipment (original packaging, labels, manuals, software CDs, all inserts, everything that was included in the delivery).

If you have decided to return the goods, please write to us at return@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

Please note that refunds are not available for:

  • Cables and connectors
  • Software
  • Devices with a used voucher and serial numbers for which they were registered
  • Custom accessories (earbuds, earbuds)
  • Needles and cartridges
  • Care and hygiene products

Warranty

We care about our customers and carefully select the producers and products that we present in Wired Tunes, which is why we are sure of their quality. If the product does not meet our standards, you will not find our catalog on the list.

Our warranty is 36 months for all products and 60 months for ADAM Audio products.

Except for consumables, strings, tubes and crossfaders, and products showing signs of misuse.

In the event of damage, please contact us via support@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

If the product cannot be repaired, it will be replaced with a new one, or in the absence of an available model, we will replace it with an analogous one in the same price range or refund the entire amount that has been paid. The most important thing is that the product is used properly.

Warranty

We care about our customers and carefully select the producers and products that we present in Wired Tunes, which is why we are sure of their quality. If the product does not meet our standards, you will not find our catalog on the list.

Our warranty is 36 months for all products and 60 months for ADAM Audio products.

Except for consumables, strings, tubes and crossfaders, and products showing signs of misuse.

In the event of damage, please contact us via support@wiredtunes.pl, after which we will contact you and inform you about the next steps of the procedure.

If the product cannot be repaired, it will be replaced with a new one, or in the absence of an available model, we will replace it with an analogous one in the same price range or refund the entire amount that has been paid. The most important thing is that the product is used properly.

Fast Delivery

All orders placed on our online store are delivered using the following delivery methods:

  • DPD Courier
  • UPS Courier
  • GLS Courier
  • DB Schenker

For orders valued up to 250 EUR, the delivery cost:

  • 15 euros: Germany, Belgium, Czechia, Hungary, Latvia, Luxembourg, Austria
  • 20 euros: Italy, Denmark, Estonia, France, Lithuania, Netherlands, Romania, Slovakia
  • 30 euros: Bulgaria, Croatia, Cyprus, Finland, Greece, Ireland, Malta, Portugal, Slovenia, Spain

For orders above 250 EUR, delivery is free.

The delivery time is typically 7 days.

For oversized orders, we use carriers such as DPD, GLS, and DB Schenker. The store manager will provide information on the cost and delivery time when your order is accepted.

Fast Delivery

All orders placed on our online store are delivered using the following delivery methods:

  • DPD Courier
  • UPS Courier
  • GLS Courier
  • DB Schenker

For orders valued up to 250 EUR, the delivery cost:

  • 15 euros: Germany, Belgium, Czechia, Hungary, Latvia, Luxembourg, Austria
  • 20 euros: Italy, Denmark, Estonia, France, Lithuania, Netherlands, Romania, Slovakia
  • 30 euros: Bulgaria, Croatia, Cyprus, Finland, Greece, Ireland, Malta, Portugal, Slovenia, Spain

For orders above 250 EUR, delivery is free.

The delivery time is typically 7 days.

For oversized orders, we use carriers such as DPD, GLS, and DB Schenker. The store manager will provide information on the cost and delivery time when your order is accepted.