Focusrite ISA C8X – Eight-Channel ISA Audio Interface with Transformer Tone
The first audio interface in Focusrite's legendary ISA range, the C8X pairs two transformer-coupled ISA preamps with six remote-controlled standard preamps, two instrument inputs and pristine 24-bit/192 kHz conversion in a single 2U USB-C unit. Built to anchor a serious recording room with classic ISA character and modern recall, it's a centrepiece interface for engineers and producers at Soundium.
Key Features
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Two ISA preamps with Lundahl LL1538 transformers: The original ISA tone in an interface, with switchable impedance and balanced inserts for outboard processing
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Six standard preamps with up to 79 dB gain: Quiet, high-headroom channels for full-band tracking, with one-touch Multichannel Auto Gain
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Console & 430 Air analog modes: Switchable circuits add ISA 110 console color or 430 MkII transformer presence at the input stage
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Two transformer-coupled instrument inputs: Front-panel DI with 400 kΩ–1.2 MΩ switchable impedance for guitars and basses
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Pro-grade monitoring: 12 balanced line outs with three monitor groups and two independent headphone outputs (130 mW @ 33 Ω)
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Comprehensive digital I/O: Dual ADAT, S/PDIF, MIDI and Word Clock for tightly integrated hybrid setups
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Full recall via Focusrite Control 2: Save and restore preamp gain, routing and headphone mixes from desktop or mobile
Customer Benefits
The ISA C8X delivers the tonal weight studios buy ISA hardware for, without the rack of outboard normally required to capture it. Smart auto-gain, deep monitoring and recallable settings keep sessions moving, while the analog tone modes and instrument inputs give you creative shaping options before anything hits your DAW. It's a single, future-proof unit that tracks bands, vocals and DI sources with finished-sounding results from the first take.
Quick Specs
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Simultaneous I/O: 26 in / 28 out via USB 2.0 Type-C
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Analog inputs: 8 mic preamps (2 ISA, 6 standard), 2 front-panel transformer instrument inputs, 8 fixed-gain line inputs
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Analog outputs: 12 balanced line outs (3 monitor groups), 2 independent 1/4″ headphone outs (130 mW @ 33 Ω)
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Digital I/O: Dual ADAT (16 ch @ 44.1/48 kHz, 8 ch @ 96 kHz), S/PDIF I/O, MIDI I/O, Word Clock
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Resolution: 24-bit / 192 kHz; up to 125 dB dynamic range on line outs
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Mic pre gain: ISA 79 dB (switchable 800 Ω – 7 kΩ impedance) / standard 69 dB
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Form factor: 2U rackmount
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Dimensions: 48.26 × 29.28 × 8.9 cm
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Weight: 5.56 kg
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Power: External IEC mains supply (~40 W); not bus-powered
What's in the Box
- ISA C8X audio interface
- 1.5 m USB Type-C to Type-C cable
- IEC power cable
- Set of four rubber feet
Use Cases / Ideal For
Ideal for tracking bands and drum kits, high-end vocal and instrument sessions, hybrid mixing rigs and any studio that needs ISA color, deep I/O and full recall in one chassis.
Compatibility
Class-compliant USB-C connection works with macOS, Windows and USB-C iPad. Routing, gain and monitor mixes are controlled via Focusrite Control 2 (desktop and mobile). Compatible with all major DAWs; ships with the Hitmaker Expansion bundle including bx_console Focusrite SC and Sonnox Oxford Reverb.
Pros & Cons
✅ Pros:
- Authentic ISA transformer tone built into a modern interface
- Huge I/O count with three switchable monitor groups
- Console and 430 Air modes shape sound before conversion
- Multichannel Auto Gain and full recall speed up sessions
⚠️ Cons:
- Requires mains power; not bus-powered
- Premium pricing reflects the boutique transformer circuitry
- ADAT channel count halves at higher sample rates
The Focusrite ISA C8X brings four decades of ISA preamp heritage into a fully recallable USB-C interface, ready to be the heart of a modern studio. If you want classic transformer character, deep monitoring and pro-level I/O in one unit, this is the ISA you've been waiting for — available now at Soundium.
