Focusrite ISA428 MKII Four Preamps w/ DI & Heritage Sound

Four legendary Focusrite mic preamps packed into a single 2U rack unit make the ISA 428 MkII an essential studio workhorse for serious recording applications. Building upon the foundation of the original ISA 110 design, this modern iteration adds three additional input impedance settings to the classic configuration, giving you complete control over microphone matching for both vintage and contemporary designs. The result is access to an incredibly diverse sonic palette, from the rich character and warmth of classic microphones to the pristine clarity of modern designs.

Each channel provides comprehensive input options including mic, line, and front-panel instrument inputs, all supported by variable input impedance to optimise performance from any source. The gain structure is particularly impressive, offering up to 60dB through the four-position rotary and gain range switches, plus an additional +20dB of continuously variable trim control. This extensive 80dB total gain range ensures compatibility with even the most demanding low-output ribbon microphones and quiet sources.

Professional features include a variable high-pass filter with cut-off frequency adjustment from 16Hz to 420Hz, perfect for controlling low-frequency content during tracking. Visual feedback comes courtesy of 6-segment LED meters displaying peak signal levels for all four mic preamps, plus the four direct inputs when using the optional A-D conversion card. Switchable rear-panel insert points complete the feature set, allowing seamless integration of external processors like compressors directly into the signal path.