The design for the ISA preamp goes right back to Focusrite's roots and the original Forte console made for AIR studios. Used on countless professional productions it remains one of the best microphone preamp designs of all time. That's why they haven't changed it, apart from the inclusion of the impedance control for easier use with the range of different microphones available today. Some things simply don't go out of fashion, great sound is one of them.
The ISA428 MkII provides four of Focusrite’s prestigious transformer-based microphone 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.
First introduced in 1985, the ISA microphone preamp holds a reputation for outstanding transparency along with subtle warmth contributed by transformer core saturation. The addition of a variable impedance circuit allows ISA users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone. Unchanged for decades, the ISA microphone preamp topology offers incredible clarity and the signature Focusrite sound that makes it the top choice among many audio professionals today.
The optional class-leading eight-channel A-D converter option used with the ISA828 is also compatible with the ISA428 MkII. Along with the four mic preamp inputs, four additional inputs allow you to route other line signals through the converter.
Four instrument inputs, instantly accessible on the front panel, allow quick and easy connection without the need for a separate DI box. Extra processing can be placed between preamp and conversion via the units dedicated insert points, featured on every channel. Finally, accurate six-segment LED metering is designed to catch even the fastest transients on every channel.
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- 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 for every channel
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