Focusrite ISA C8X USB Audio Interface and Mic Preamp System

Overview

The Focusrite ISA C8X is a premium rackmount audio interface and preamp system that combines the legendary ISA sound with advanced digital control, extensive connectivity and full studio integration. Designed for professional environments, the ISA C8X delivers exceptional analogue tone, flagship conversion quality and complete routing flexibility for modern recording, mixing and monitoring workflows.

With two transformer-based ISA preamps, six additional ultra-low-noise mic preamps, high-end AD and DA conversion and powerful remote control via Focusrite Control 2, this unit is built to run an entire studio from a single central hub.

Main Features

• 2U rackmount 26 input 28 output USB audio interface
• Two ISA preamps with Lundahl transformers and up to 79 dB of gain
• Six additional ultra-low-noise mic preamps with 69 dB gain
• Analogue Console and 430 Air modes for tonal shaping
• 24 bit 192 kHz AD and DA conversion with 125 dB dynamic range
• Twelve balanced line outputs supporting up to immersive formats
• ADAT, SPDIF, MIDI and Word Clock connectivity
• Remote control via Focusrite Control 2 desktop and mobile app
• Two independent headphone outputs with class AB amplification
• Designed for patchbay integration and permanent studio setups

Legendary ISA Preamps with Modern Control

At the heart of the ISA C8X are two classic ISA mic preamps featuring Lundahl LL1538 input transformers. These deliver subtle warmth, depth and musical character while maintaining clarity and precision.

Each preamp includes:

• Stepped and fine gain control
• Switchable input impedance
• High-pass filtering
• Balanced insert points
• Up to 79 dB of gain

All parameters can be controlled directly from the front panel or remotely via software, giving you complete flexibility in any studio environment.

Analogue Tone Shaping

The ISA C8X introduces powerful analogue tone shaping options inspired by classic studio hardware.

Console mode adds subtle saturation and enhanced low-end weight using a soft-clip circuit, while 430 Air mode delivers high-frequency clarity and shimmer based on an inductor-driven high-shelf design.

These features provide immediate access to rich, musical tone shaping without the need for external processing.

Six Additional Mic Preamps

Alongside the ISA channels are six ultra-low-noise Focusrite mic preamps, offering clean and detailed capture with up to 69 dB of gain.

Each preamp includes analogue Air processing for added clarity and a variable Drive control that introduces harmonic saturation, giving you a wide range of tonal possibilities from transparent to characterful.

Premium AD and DA Conversion

The ISA C8X uses the same high-performance converters found in Focusrite’s RedNet systems, delivering professional-grade audio quality.

• 24 bit 192 kHz conversion
• 125 dB dynamic range
• Ultra-low distortion at 0.00022 percent THD

This ensures accurate capture and playback across all inputs and outputs.

Built for Complete Studio Integration

Designed for permanent installations and complex routing setups, the ISA C8X offers fixed line inputs for connecting outboard gear without constant re-patching.

With twelve balanced line outputs, the system supports everything from simple stereo monitoring to immersive audio formats up to 7.1.4. Multiple monitor groups can be configured and switched from the front panel or software.

Flexible Connectivity and Expansion

The ISA C8X is built to expand with your studio.

• Up to 16 additional channels via ADAT
• Two channels via SPDIF
• MIDI connectivity for hardware integration
• Word Clock I O for system synchronisation

This makes it easy to scale your setup while maintaining full control and performance.

Remote Control and Workflow Integration

Focusrite Control 2 provides complete remote control of the ISA C8X from desktop or mobile devices.

Manage gain levels, routing, monitoring and presets with ease, even when the unit is installed in a rack or separate room. The software also supports control of multiple connected interfaces, making it ideal for expanding systems.

Instrument Inputs and Monitoring

Two front-panel instrument inputs allow direct connection of guitar, bass and other sources, with selectable impedance and transformer-based circuitry for natural tone.

Two dedicated class AB headphone outputs provide powerful, detailed monitoring with independent level control and optimised impedance.

Included Software

Sonnox Oxford Reverb

Craft the perfect reverb for any track with Oxford Reverb — a highly flexible, algorithmic reverb plugin that allows you to precisely dial in your desired space.

Hitmaker Expansion

The Focusrite Hitmaker Expansion bundle is a collection of professional music production plugins and software, designed to cover every stage of the process - from writing and recording to mixing, mastering, and releasing tracks. It brings together instruments, effects, and studio tools from leading software brands (like synths, drums, vocals processing, and mastering services) so you can create release-ready music with “big studio” sound right out of the box.

All other product names and brands cited herein are property of their respective owners. All company, product and service names used on this page are for identification purposes only. Use of these names, logos, and brands does not imply endorsement.

Reliable and Future-Ready

Built for long-term use in demanding environments, the ISA C8X is backed by a three-year warranty and round-the-clock technical support, ensuring peace of mind for professional users.

What’s In The Box

• ISA C8X audio interface
• USB type C-to-C cable
• Region-specific IEC cable
• Rubber feet (x4)

Why Choose the Focusrite ISA C8X

The Focusrite ISA C8X is a comprehensive studio solution that combines legendary analogue preamps, cutting-edge digital control and extensive connectivity. Whether you are recording, mixing or building a scalable studio system, it offers the performance, flexibility and reliability required for professional results.