The ISA428 MkII provides four of Focusrite’s prestigious transformer-based mic preamps. It features the same classic circuitry and renowned audio quality found in the original, at a new level of affordability. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analogue to digital conversion, the ISA428 MkII creates the perfect front end for the discerning recording professional.
The acclaimed optional ISA828 eight-channel A-D converter is also compatible with the ISA428 MkII. High-quality converter chips seated within Focusrite custom analogue circuitry deliver unparalleled A-D performance, including a dynamic range of 122dB and jitter performance below 250 picoseconds.
This Focusrite ISA428 MkII also features:

• Four ISA series transformer-based preamps
• Eight-channel optional A-D converter
• Selectable impedance
• Four front panel instrument inputs
• Dedicated analogue insert points
• Variable high pass Focusrite filter
• Accurate LED meters on every channel catch even the fastest transients
• Phantom power available on every channel
• Trim control allows 20dB of extra gain with fine adjustment
• Phase reverse buttons help to correct phase issues with microphones or cables
• Optional A-D converters easily synchronise to external word clock