Most cheap, poorly designed SMPSs are noisy. ifi audio makes a series of high quality SMPSs at several price points. Here's an example: iFi audio iPowerX Buy these at Amazon. If you don't hear an improvement, return it. |
Linear power supplies are much better .For example, high-end DACs have them and are a key differentiator between the mass market sub $1000 offerings and high-end units. They are designed for low noise and are often considered quiet since there is no high-frequency switching. They are used anywhere that excellent regulation and/or low ripple is required as well as needing low electromagnetic emissions and excellent transient response.
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