PS AUDIO PERFECTWAVE DIRECTSTREAM MK2 D/A PROCESSOR
hen I reviewed the new version of PS Audio’s classic D/A processor in the June 2023 issue, I enjoyed its sound quality, but some aspects of its measured performance concerned me. The impulse and frequency responses, the behavior of the reconstruction filter, the channel separation, the low intermodulation distortion, and the balanced and singleended output impedances were all beyond reproach, and though harmonic distortion was higher in level than I was expecting, it was still sufficiently low. However, the level of ultrasonic noise was higher than I had found with PS Audio’s original DirectStream processor running the “Windom” FPGA firmware: The MK2 processor running the v2.3.6
