Accuphase DC-91
The Accuphase DC-91 is a 20-bit digital-to-analog converter from the mid-1990s. It was sold alongside the company's DP-90 CD transport.
Digital inputs were HPG (Accuphase's own high-speed balanced digital connection), Toslink fiber-optic, and coaxial. A balanced digital input was also present. On the output side, you got both balanced and unbalanced analog connections, plus a phase switch and an output-level control. Rated THD was 0.002% from 20-20,000 Hz, with a signal-to-noise ratio of 120 dB. Audio (April 1994, p.56) measured the DC-91's dynamic range for 16-bit signals at 98.0 dB (left) and 97.8 dB (right). Quantization noise came in at -93.4 and -93.5 dB respectively. The reviewer noted these as among the best results measured in their lab to date.
The DC-91 appears to have been a top-tier companion to the DP-90 transport. Beyond its listing in period directories and a few magazine profiles, detailed documentation is scarce. What the record shows is a high-performance 20-bit converter with an unusually comprehensive input suite for its day.
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