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Focusrite ISA One – Single Channel Classic ISA Mic Preamp/DI

Name: Focusrite ISA One – Single Channel Classic ISA Mic Preamp/DI
Brand: Focusrite
SKU: FOC-MOIFONEAB-AU

$999.00

The Focusrite ISA One is a single-channel, transformer-based mic preamp and DI that delivers the unmistakable sound of the classic ISA110 circuit in a rugged, portable format. Featuring the renowned Lundahl input transformer, switchable impedance options, and an independent DI channel, it offers exceptional tonal flexibility — from vintage warmth to modern transparency — making it a powerful front-end for vocals, instruments, and studio recording.

SKU: FOC-MOIFONEAB-AU Categories: DI Boxes, Mic Preamps, OUTBOARD, Preamps

Brands: Focusrite

Brand: Focusrite

Description

OVERVIEW

At the core of the Focusrite ISA One is the legendary ISA110-based microphone preamp design, enhanced with a Lundahl LL1538 input transformer that delivers a rich, musical character impossible to replicate digitally. This transformer stage interacts directly with your microphone, adding depth, warmth, and subtle harmonic detail that has defined professional recordings for over four decades. Whether you’re capturing vocals, acoustic instruments, or studio sources, the ISA One provides a refined and unmistakably “classic” sound.

What sets the ISA One apart is its versatility. With four selectable input impedances, you can precisely match the preamp to your microphone, shaping tone and response to suit any recording scenario. From enhancing the character of vintage mics to achieving clean, modern clarity, the ISA One adapts effortlessly. Its independent DI channel adds even more flexibility, featuring high and low impedance settings, its own gain control, dedicated outputs, and the ability to route signals to an amplifier or optional A/D converter.

Designed for both studio and portable use, the ISA One includes a headphone output with cue mix capability, a dedicated insert point for outboard processing, and detailed metering via a backlit VU meter and LED peak indicators. Optional high-quality 192kHz A/D conversion further expands its capabilities, making it a complete recording front-end. Built to the highest standards, the ISA One combines heritage sound, modern control, and professional reliability in one compact unit.

KEY HIGHLIGHTS

Classic Mic Pre with Independent DI

Featuring a rugged, portable all-metal enclosure, ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion. At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer – essentially the same circuit, based on the original ISA 110, that has been used for 40 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can’t be truly emulated in any other way, while the modern twist of variable input impedance allows for a new degree of flexibility.

Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the ISA One, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A-D converter and separate rear-panel XLR output.

Brainworx bx_console

The Focusrite Studio Console reborn in your DAW

The Focusrite Studio Console defined countless hits of the 80s and 90s, thanks in large part to its ISA 110 Equaliser and ISA 130 Dynamics Modules. Brainworx’s bx_console Focusrite plug-in brings you stunningly accurate emulations of both in a single plug-in, perfectly capturing the famously warm, open sound of two of the most revered pieces of studio hardware ever made.

Enjoy 3 Years of Warranty

All Focusrite products are built to the highest standards and are designed to provide many years of reliable performance.

FEATURES

ISA series transformer-based preamplifier — Encased in a rugged and portable chassis, ISA One offers the classic Focusrite microphone preamplifier at its lowest cost to date.
Flexible independent DI channel — ISA One is ideal for both engineers and demanding performers alike, featuring front-panel inputs with High (2.4 MΩ) and Low (470 kΩ) impedance settings, independent gain control, an output for routing to an amp, an independent XLR output on the rear, and routing to the optional A-D converter.
Switchable impedance — Choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphone.
Headphone output with volume control — ISA One can feed either a sum of the two inputs to the headphone output, or an external stereo cue mix (such as a stereo feed from an interface) via two TRS jack inputs on the rear of the unit.
Dedicated insert point — Allows you to place extra processing between the preamplifier or DI and the optional converter, such as an EQ or compressor.
Optional stereo 192kHz A-D converter — You can choose to upgrade your unit with an optional digital card that delivers the best A-D performance in its class (dynamic range of 118dB). Alternatively, the ISA One Digital comes with the A-D converter as standard.
Lundahl LL1538 Input Transformer — The original mic transformer used in the original Red modules helps to provide the unique sound and performance of this groundbreaking design.
Backlit VU meter with variable calibration — ISA One has a moving coil VU meter with variable calibration to suit analogue and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert.