Focusrite ISA 115-HD
Surviving information on the Focusrite ISA 115-HD is extremely thin. No original documentation, review, or directory entry has surfaced that names this exact model, so its intended role in the ISA series is undocumented. It appears in the Archive as a distinct designation, but whether it was a preamp channel, a module variant, an unproduced prototype, or a regional version is not recorded. There are no production years, specifications, or prices on file for it.
What period material does exist concerns Focusrite itself around the late 1980s. A directory listing in Mix-Magazine (October 1987, p.261) placed Focusrite U.S. Ltd. at 1100 Wheaton Oaks Court, Wheaton, Illinois, and gave a set of figures — 50-ohm input impedance, recessed front-panel gain control from −70 dB to +14 dB, separate power supply, and short-circuit-proof outputs, priced at $820 — but no model name is attached to those numbers in the surviving text, and there is no evidence linking them to the 115-HD. Earlier that year, Mix-Magazine (August 1987, p.23) carried a Focusrite advertising spread quoting engineers Kevin Mills of Larrabee Sound and Robert A. Tis of Electric Lady Studios in glowing terms. That tells us the company had a strong reputation by 1987, but it says nothing specific about this model. Beyond these fragments, nothing more is recorded about the 115-HD.
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