PS AUDIO DIGITAL LINK MEASUREMENTS
Intrigued by this 30-year-old D/A processor, I thought it would be interesting to run it through my standard set of measurements, using my Audio Precision SYS2722 system (see the January 2008 “As We See It”1).
The Digital Link’s serial number on the pcb was 1172. Its single coaxial S/PDIF input would lock only to data sampled at 44.1 or 48kHz, an understandable limitation of its Yamaha S/PDIF receiver chip—back in 1989, there were, were non-inverting), and the output impedance was a very low 1.3 ohms from 20Hz to 20kHz. (The PS Audio uses a high-performance Analog Devices AD847 op-amp chip for each output channel.)
