Focusrite ISA 428MKII.
The ISA428 MkII brings four channels of Focusrite’s legendary transformer-based microphone preamp technology to professional recording studios at an exceptional value. Featuring the same renowned circuitry and audio quality as the original ISA series, the ISA428 MkII delivers outstanding transparency, subtle transformer warmth, and the flexibility needed for demanding recording environments.
First introduced in 1985, the ISA microphone preamp has become a studio standard thanks to its exceptional clarity and musical character. With selectable input impedance, each channel can be precisely matched to any microphone, allowing engineers to optimize performance or creatively shape the tonal response of their sources.
The ISA428 MkII features four independent mic preamp channels, four front-panel instrument inputs, and dedicated insert points on every channel for integrating external processors such as compressors and EQs before conversion. Accurate six-segment LED metering provides detailed monitoring of input levels, capturing even fast transients with confidence.
For expanded digital workflows, the optional eight-channel A/D converter adds premium conversion with additional line inputs, making the ISA428 MkII a complete front end for modern digital studios. Featuring high-quality Burr-Brown Pro Audio amplifiers and PCM4220 converter technology, the converter option delivers exceptional dynamic range, low jitter performance, and seamless integration with professional DAW systems.
Features
- Four transformer-based Focusrite ISA microphone preamps
- Classic ISA circuitry with exceptional clarity and subtle transformer warmth
- Variable input impedance for microphone matching and creative tone shaping
- Four front-panel instrument inputs for direct guitar and bass recording
- Dedicated insert points on every channel for external processing
- Six-segment LED metering on each channel
- Optional eight-channel A/D converter expansion
- Four additional line inputs through optional converter card
- Professional-grade Burr-Brown amplifiers and PCM4220 A/D conversion
- Dynamic range up to 122dB with ultra-low jitter performance
- 25-pin D-Type digital connection for integration with professional systems
Optional A/D Converter Features
- Eight channels of high-quality analogue-to-digital conversion
- Compatible with ISA828 and ISA428 MkII
- Retrofits easily at any time
- Designed for seamless integration with digital audio workstations, including Pro Tools
Applications
Ideal for recording:
- Vocals
- Drums
- Guitars and bass
- Acoustic instruments
- Studio sessions requiring premium analogue front-end quality
The ISA428 MkII combines decades of Focusrite engineering expertise with modern studio flexibility, making it an ideal choice for preserving the character of classic microphones and capturing professional-quality recordings.
