Accuphase 91-D (ca. 1994–1996)
Very little is documented about the Accuphase 91-D. It shows up under the full model designation DC-91, a 20-bit digital-to-analog converter sold alongside the DP-90 CD transport in the mid-1990s. The record is thin, but the period sources that survive give a clear set of specifications and a rough market position.
The DC-91 had four digital inputs: HPG (Accuphase's own high-speed balanced digital interface), Toslink fiber-optic, HPC balanced digital, and standard coaxial. Analog output came in both balanced (XLR) and unbalanced (RCA). The front panel carried a phase switch and an output-level control. HiFI-Stereo (1996, p.96) listed rated THD at 0.002% from 20 - 20,000 Hz and a signal-to-noise ratio of 120 dB. The same source gave dimensions of 18 × 5⅛ × 15 inches and a weight of 49.7 lb. The original price was $15,995.
Audio magazine (December 1994, p.143) indexed a full equipment profile of the DP-90 transport and DC-91 converter appearing in the April 1994 issue (pp.44–50), confirming the unit was on the market by early 1994. Beyond that review, little else has surfaced. The 91-D appears to have been Accuphase’s reference D/A converter of the period, built with the heavy chassis construction and logical-relay switching approach typical of the brand’s top-tier components in the 1990s.
No production run data, successor models, or common points of failure have been documented. It was a capable, expensive converter from Accuphase's first generation of serious outboard D/A hardware. It seems to have been produced in limited numbers and is now scarce on the used market.
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