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A SMPS uses a high-frequency, variable-duty-cycle square wave to drive its transformer. This is basically a recipe for a HF radiated-noise generator, especially compared to a traditional linear power supply, where the transformer is fed by a low-frequency sine wave.

With that said: The proof of the overall design is not at the power supply output, but at the audio output jacks - that's what we're ultimately listening to. To reiterate Milt's statement above, it is definitely more difficult to design a low-noise SMPS, but it's not impossible. There are many examples of truly excellent audio gear designs using this type of power supply these days. It's also worth remembering that the sine wave emerging from our electrical outlets, which directly feeds a conventional linear supply, contains significant distortion and noise to begin with.
 
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