Nakamichi DAC-101
A car-stereo D/A converter good enough that a reviewer measured 0.002% THD through it - and then had to decide whether that was worth the money.
Overview
The DAC-101 only makes sense once you know the system it served. It was Nakamichi's outboard digital-to-analog converter for the car, a 14.4-volt box meant to sit between the company's CDC-101 CD changer and the rest of a mobile audio chain. It sold for $495, which next to an $895 changer and an $895 head unit was not a trivial add-on. It measured about 8⅜ inches wide, 1⅞ inches tall and 7 inches deep, and weighed 3 lbs., 15 oz. Small enough to tuck almost anywhere.
According to Nakamichi's own advertising, the CDC-101 was the first mobile CD player with a direct digital output, and the DAC-101 was the first outboard mobile converter built to accept it. Nakamichi's marketing billed the converter as using four D/A converter circuits in a "4 x 4" configuration to cancel instabilities, glitches and noise, paired with an 8-times oversampling digital filter. Marketing copy is not a verdict, but the numbers underneath it were real, and independent testing bore them out.
The DAC-101 accepted sampling frequencies of 32, 44.1 and 48 kHz. Nakamichi positioned the last of these as readiness for future digital-output car components such as a DAT player. Published frequency response was 5 Hz to 20 kHz, ±0.5 dB, with a signal-to-noise ratio greater than 105 dB (IHF A-weighted), dynamic range better than 98 dB, channel separation better than 100 dB, and THD and THD+N each quoted at 0.0025% at 1 kHz and 0 dB. It drew a maximum of 1 ampere from the car's electrical system, with 14.4 V d.c. nominal and 10.8 to 15.6 V permissible on a negative ground.
The measurements are the reason this box has a following. Audio (May 1990, p.60) ran the converter against the changer's own internal D/A circuits. The changer alone delivered less than 0.04% THD+N, and through the DAC-101 it dropped to an "incredibly low 0.002%" - close to the limits of the reviewer's Audio Precision test gear. The same review (May 1990, p.62) reported the fade-to-noise test yielding an EIA dynamic range of 102 dB for the changer alone and 110 dB with the DAC-101 in the chain. Signal-to-noise, measured at the converter's outputs, came in at 114.9 and 113.9 dB across the two channels. On linearity, the converter was described as even nearer perfect than the changer's own outputs. Harmonic artifacts in a 1 kHz spectrum analysis sat more than 90 dB below the signal, against roughly 80 dB from the head unit alone.
There were caveats. The reviewer noted that the CDC-101/DAC-101 combination was slightly less flat at the top than the changer by itself - down about 0.5 dB at 20 kHz through the converter versus 0.2 to 0.3 dB for the changer alone - even as the combination showed flatter overall response and less high-frequency ripple. Whether any of this mattered in a moving car was left open. Audio (May 1990, p.68) framed the decision to add the converter and control amp as "a battle between purism and pocketbook."
A collector chasing one today is buying a period mobile component with a proprietary role in a specific Nakamichi car stack. Its value is as much system integrity as standalone performance, and the pool of buyers is the people restoring TD-560/CDC-101/CA-101 installations. Prices and current market activity are not documented in available sources.
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