Focusrite ISA ISA Two (production dates undocumented)
Little is documented about the Focusrite ISA Two. The period record gives one headline specification and the model's place in the ISA family. Mix (July 2012, p.33) quoted an equivalent input noise figure of -127 dB at 60 dB of gain into a 150 ohm source. That is squarely microphone-preamplifier territory.
The same review traced the lineage. The ISA line began with the ISA 110 wide-bandwidth mic preamp/EQ module. It came from a request by Beatles producer George Martin for the custom Neve consoles at AIR Studios in London and Montserrat. The module was introduced in 1987, while Focusrite was owned by Rupert Neve, and it started an uninterrupted ISA family. The ISA Two is presented as a member of that family.
Beyond that, the archive's notes are empty. No release date, no original price, and no design or service documentation has surfaced. If a manual or spec sheet turns up, this page should grow to match it.
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