If you start with an amplifier, but have a crappy source the signal can only be as good as the source. And if you build a better supply for your source you start with better. The power coming from the wall is the power used to create every signal in your audio system. Granted, most companies don't put expensive power supplies in their gear, it's just too expensive to manufacture for a large company. Companies like Bel Canto, W4S, Nuforce, etc all use switching supplies and are incredibly noisy and dry sounding. EVERY switchmode supply I have heard was noisy compared to a linear supply. The switching aspect is well above the audible spectrum. My amplifier is a Class D amplifier with a Linear PSU. Switchmode supplies in many products on the market DO NOT have their switching frequency above the audible spectrum, however.
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