ISA C8X
26-in, 28-out USB-C audio interface with eight preamps, including two ISA transformer mic preamps
$1999.99
ISA
Choose your ISA
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ISA preamps
Choose one, two, four or eight channels of heritage ISA sound — engineered to last.Find out more -
ISA audio interface
ISA C8X is a modern USB-C audio interface built with deeply musical, Lundahl transformer-based preamps.Find out more -
ISA ADN cards
Expand selected ISA preamps with ADAT, Dante, and AES3 digital connectivity via optional ADN expansion cards.Find out more
ISA One
Classic mic pre with independent DI
$719.99
ISA Two
Two channels of classic Focusrite mic pres
$1079.99
ISA 428 MkII
Classic ISA four-channel mic pre
$2529.99
ISA 828 MkII
Classic ISA eight-channel mic pre
$3909.99
ISA ADN2
Two-channel A-D card for ISA One, including Dante connectivity
$569.99
ISA ADN8
Eight-channel A-D card for ISA 428 MkII and ISA 828 MkII, including Dante connectivity
$799.99
40 years of ISA
In 1985, Rupert Neve designed a mic preamp for Sir George Martin. That circuit became the foundation for every ISA product made ever since. From the Forte console to today’s standalone preamps and the ISA C8X audio interface, the same Lundahl LL1538 transformer and design philosophy runs through it all.
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1985
The first request
Sir George Martin commissioned Rupert Neve to build a no-compromise mic preamp. The result, the Input Signal Amplifier 110, which set a new benchmark for warmth and musicality. -
1988
The Focusrite Forte Console
Designed to be the ultimate studio console, the Forte used the finest components and became a symbol of engineering excellence. -
1990
The Focusrite Studio Console
After acquiring Focusrite, Phil Dudderidge built the ISA 110 and 130 modules into the Focusrite Studio Console — acclaimed to this day for its warmth and depth. Only ten were made. -
Present
ISA today
What began as a console is now a range of standalone preamps and the ISA C8X audio interface. The same transformers and design, evolved for how studios work today.
The Lundahl LL1538
The same Lundahl LL1538 chosen by Rupert Neve in 1985 sits at the heart of every ISA preamp, bringing warm, open, and detailed character to any signal.
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The Story of ISA
From the ISA 110 in 1985 to the Forte console, the Focusrite Studio Console, and the standalone preamps trusted in professional studios today: 40 years of engineering, captured in one documentary.
Session logs
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Steph Marziano
Hayley Williams, Sir Chloe, Vundabar, Cassandra Jenkins
“Punchy and musical without any effort from me. I've been using them on my drums and it's making them sing in a way they never have before.”
Explore ISA 428 MkII -
Riccardo 'Ricky' Damian
Mark Ronson, Sampha, Jorja Smith, Yebba
“One of the most versatile preamps on the market. I carry it for mobile sessions and residencies — the perfect pairing for any producer wanting to expand their setup.”
Explore ISA 828 MkII -
Catherine J Marks
boygenius, Wolf Alice, PJ Harvey, St. Vincent
“ISA has become a fundamental part of my setup... eight high-quality preamps that give me flexibility without compromising on sound.”
Explore ISA 828 MkII -
James Rand
Sega Bodega, Shygirl, COBRAH, LSDXOXO
“Everything sounds like the best version of itself. I love the switchable input impedances with my synths, and there's a subtle low-mid curve that just sounds great.”
Explore ISA 828 MkII -
Jess Camilleri
Mahalia, Eliza Oakes, Invariance
“The ISA sits in a really nice space between 'clean' and 'colourful' — high enough specification for when fidelity matters, yet never cold or clinical.”
Explore ISA 828 MkII -
Chris Kalcov
BBC, English National Opera, National Theatre Live
“The ISA sits somewhere between clean and colourful — a slightly larger-than-life quality that carries real gravitas. It consistently proves popular with voiceover artists.”
Explore ISA One
Always on, always ready
Watch Grammy-nominated songwriter and producer Steph Marziano talk about how the ISA 428 MkII became the backbone of her studio and why the demo is usually the final take.
The rig that goes everywhere
Learn about producer and engineer Ricky Damian’s portable, ISA-centred rig he’s trusted for over a decade working with Mark Ronson, Sampha, Jorja Smith, and more.
Classic sound in digital form
Brainworx faithfully emulated the ISA 110 and 130 modules in the bx_console Focusrite SC, bringing the warmth, depth, and musicality of the tools that shaped the sound of the 80s and 90s to your DAW. It features 72 individually modelled channels and patented Tolerance Modelling Technology — included with every ISA preamp and ADN card, and as part of Hitmaker Expansion with ISA C8X, Scarlett, and Clarett+ interfaces.
Read the full story
Why choose Focusrite?
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Three-year warranty
Three years of confidence, built in. Every ISA product is covered as standard, because trust in your gear has to go far beyond the purchase date.
See what's covered
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Award-winning support
Real people, real expertise. Our support team has won awards for a reason. And they're here whenever you need them.
Get support
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Free delivery and returns
Free delivery and free returns mean you can put ISA to the test in your studio before you commit.
Find out more