Focusrite ISA 428 MKII Microphone Preamp

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The ISA428 MkII from Focusrite is a four-channel microphone preamp featuring Focusrite's transformer-based preamps. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analog to digital conversion, the unit is a perfect front end for the audio professional, whether utilizing digital or analog recording.

The ISA microphone preamp holds a reputation for delivering transparency along with subtle warmth derived from transformer core saturation. The addition of a variable impedance circuit allows users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone.

The extremely broad frequency response of Focusrite preamps (close to 200 kHz at the top end) guarantees accurate phase response across the range of human hearing, with the roll-off point being moved entirely outside of the audible hearing range. Warmth, plus beautifully open, unrestricted high frequencies, is a classic hallmark of the mid 80's Focusrite designs to which this preamp owes its design.

The optional eight-channel analog converter utilizes high-quality Burr-Brown amplifiers and PCM4220 A-D converter chips seated within Focusrite's custom analog circuitry. Specifications include a dynamic range of 122dB and jitter performance below 250 picoseconds. The card can be retrofitted at any time and due to the convenient 25-pin D-type connector, it integrates seamlessly with most digital workstations, including Pro Tools.

A premium bonus is the Brainworx bx_console Focusrite SC channel-strip plug-in, a stellar digital emulation of the legendary and rare Focusrite Studio Console. Only 10 of the consoles were ever produced, but you can access its famed sound directly in your DAW.

Four ISA Series Transformer-Based Preamps

ISA series microphone preamps have been the producers' choice on countless hit records over the last two decades

Eight-Channel A-D Converter (Optional)

Four additional A-D converter inputs allow eight channels of high-quality conversion, with a dynamic range of 122dB and jitter performance below 250 picoseconds

Selectable Impedance

Ideal for microphone matching or extended microphone creativity - settings include the "Vintage ISA110" setting that provides the original Focusrite signature sound


Four Front Panel Instrument Inputs


Instant access on the front fascia - no separate DI box required

Dedicated Analog Insert Points

Switchable insert points are featured on every channel, allowing routing (between pre-amp and output) through additional external processing

Variable High-Pass Focusrite Filter

Provided on every channel, this is the same filter as featured on the original ISA428

Accurate LED Meters for Every Channel


Clear metering designed to catch even the fastest and most elusive of transients

Additional Features

• Phantom power available on every channel

• Trim control allows 20dB of extra gain with fine adjustment

• Phase reverse buttons help to correct phase issues with microphones or cables

• Optional A-D converters easily synchronize to external word clock

• Includes Brainworx bx_console Focusrite SC channel-strip plug-in, a stellar digital emulation of the legendary and rare Focusrite Studio Console