Audio Research D-110 (circa 1979–1980)
Almost nothing is documented about the Audio Research D-110. What survives of the record is a handful of classified advertisements in Audio magazine, which place the model on the used market between 1979 and 1980. The earliest known listing asked $1,850 (Audio, September 1979, p.110); by July 1980 a "mint" example was offered at $1,700 (Audio, July 1980, p.83); and an October 1980 ad described a "D-110 AMP" at $1,250 (Audio, October 1980, p.144).
The "AMP" label in that last ad confirms the D-110 was an amplifier, consistent with the D-prefixed power amplifiers Audio Research produced during this era, such as the D-79 and D-1004. No owner's manual, schematic, period review, or specification sheet has surfaced, so power output, circuit design, production years, and original price all remain undocumented.
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