Focusrite ISA 428 MkII

Variable input impedance allows you to change how the preamp interacts with your microphone. By selecting between 600, 1400, 2400, and 6800 Ohms, you can subtly alter the frequency response and character of your mic, giving you more sonic options without needing to swap hardware.

The unit provides analog line-level outputs that connect directly to your interface's line inputs. If you need to connect digitally, there is an optional A-D converter card available for purchase that allows for direct digital output.

Yes, with up to 80 dB of gain available, the ISA 428 MkII has plenty of clean headroom to drive even low-output ribbon microphones effectively. The variable impedance settings also help you optimize the load for different ribbon mic designs.

The high-pass filter is continuously variable from 16Hz to 420Hz. This gives you precise control to remove unwanted low-end rumble or mud from your source signal before it ever hits your converter.

Yes, the ISA 428 MkII features switchable 48V phantom power on each of its four channels, allowing you to use it with any standard condenser microphone.

Built around the classic Lundahl LL1538 input transformer, this preamp offers a sound that is often described as 'musical' and 'authoritative.' It provides a vintage-inspired warmth and clarity that adds professional weight to vocals and acoustic instruments without sounding overly colored or distorted.