The New Focusrite ISA 828
This August sees the unveiling of Focusrite’s new ISA 828 eight channel microphone pre-amplifier. The ISA 828 features eight original ISA transformer-based pre amps in a single robust 2U chassis, and offers the Focusrite signature sound at the lowest cost per channel to date.
The eight ISA-series transformer-based microphone pre amps feature exactly the same vintage microphone pre-amplifier design as the original ISA110 module from Focusrite's critically acclaimed Forte console (including the original Lundahl L1538 transformer and bespoke zobel network).
The pre-amps are complemented by eight line inputs, four instrument inputs and an optional eight channel 192kHz ADC that outperforms every other converter yet devised. Thanks to its convenient 25 pin D-Type connectors, the ISA828 also integrates quickly and seamlessly with ProTools HD, as well as other popular hard disk recorders and mixing desks.
The microphone input stage includes a variable impedance circuit, allowing the user to switch between four carefully selected input impedance settings. The original ISA 110 setting is supplemented by three further impedance settings to perfectly match/creatively mismatch the pre amp with any microphone collection.
The four front panel instrument inputs also feature high and low impedance options to provide a comprehensive and accessible DI solution. Insert switches are also featured on every channel, should the need arise to place extra processing between the pre amp and converter. Vintage design high-pass filters are also provided on every channel.
Focusrite’s optional eight-channel 192kHz ADC embodies cutting-edge conversion technology, seated within Focusrite custom analogue circuitry. This provides eight channels of A/D conversion, delivering unparalleled performance; noise at -122dBF and jitter < 250 picoseconds.
Finally, every channel features a six LED input meter, complete with precise meter trim. The meter displays and meter trim calibrations utilise the same reference points as Digidesign’s HD system and provide clear and accurate input metering, independent of the DAW.
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…