OverviewDiscover the Focusrite ISA428MKII, a game-changer for recording professionals! This remarkable device offers four prestigious transformer-based microphone preamps, delivering the same classic circuitry and renowned audio quality as the original, now at an unbeatable price.
With selectable input impedance, direct instrument inputs, and an optional eight channels of high-quality analogue to digital conversion, the ISA428MKII is the perfect front end for your studio. Whether you're preserving the sound of your classic microphones or creating a digital masterpiece, this preamp will take your recordings to the next level.
The ISA microphone preamp has a legendary reputation for outstanding transparency and subtle warmth. The variable impedance circuit allows you to perfectly match the preamp with any microphone or creatively shape the sound. The optional eight-channel A-D converter is compatible with the ISA428MKII, providing even more flexibility.
Four instrument inputs on the front panel make it easy to connect without a separate DI box. Dedicated insert points on every channel allow for extra processing, and accurate six-segment LED metering ensures you catch every transient.
Focusrite has been a trusted name in audio for over 25 years, bringing superb quality and engineering excellence to professionals worldwide. The ISA428MKII is a must-have for any discerning recording artist.
Key Features- • Four ISA series transformer-based preamps for unparalleled sound quality
- • Optional eight-channel A-D converter for high-quality conversion
- • Selectable impedance for perfect mic matching and creative sound shaping
Technical Specifications- • Weight: 5.5kg (12.2lbs)
- • Dimensions: 480mm (W) x 88mm (H) x 280mm (D) (19' (W) x 3.5' (H) x 11' (D))




The Focusrite ISA428MKII is a top-of-the-line 4-channel pro mic preamp designed for recording professionals. Whether you're in a professional studio or on the go, this preamp is perfect for capturing high-quality audio. With its four ISA series transformer-based preamps, optional eight-channel A-D converter, and selectable impedance, you'll have everything you need to create amazing recordings. The preamp also features four instrument inputs on the front panel, dedicated insert points on every channel, and accurate six-segment LED metering. Its weight of 5.5kg (12.2lbs) and dimensions of 480mm (W) x 88mm (H) x 280mm (D) (19' (W) x 3.5' (H) x 11' (D)) make it easy to transport and set up in any location.