Hi, Emory. As I said above, I try to keep an open mind on this. And it’s certainly true that at one time, switching power supplies were very noisy – I used to design them in the 80’s, for very high-power industrial applications, before I committed to the one true vocation which is Software 
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As for data, the indefatigable hobbyist and fellow forum member @Archimago has posted some measurements here which incline me to believe there will be “NO resulting change in audible sound quality”. So unless I can see some evidence to the contrary from someone who’s not trying to sell me a different power supply…