People discuss many aspects of the performance of audio equipment. But one area that tends to be neglected is the importance of the power supply [see p103]. By this I mean the circuitry inside equipment that converts raw mains AC into smooth DC to power amplifiers and other components. Yet the reality is that the details of these power supply units (PSUs) is often critical when it comes to obtaining the best possible performance.When I used to design audio equipment for a living, and instrumentation for precision measurements, the PSU design became something I regarded as an integral part of any device I was working on. The PSU had to be tailored to suit the task. And in some cases I found I could get superior results by using an approach that went against common assumptions.
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